Catheter Ablation: Removal of tissue with electrical current delivered via electrodes positioned at the distal end of a catheter. Energy sources are commonly direct current (DC-shock) or alternating current at radiofrequencies (usually 750 kHz). The technique is used most often to ablate the AV junction and/or accessory pathways in order to interrupt AV conduction and produce AV block in the treatment of various tachyarrhythmias.Catheters, Indwelling: Catheters designed to be left within an organ or passage for an extended period of time.Atrial Fibrillation: Abnormal cardiac rhythm that is characterized by rapid, uncoordinated firing of electrical impulses in the upper chambers of the heart (HEART ATRIA). In such case, blood cannot be effectively pumped into the lower chambers of the heart (HEART VENTRICLES). It is caused by abnormal impulse generation.Electrophysiologic Techniques, Cardiac: Methods to induce and measure electrical activities at specific sites in the heart to diagnose and treat problems with the heart's electrical system.Tachycardia, Supraventricular: A generic expression for any tachycardia that originates above the BUNDLE OF HIS.Catheters: A flexible, tubular device that is used to carry fluids into or from a blood vessel, hollow organ, or body cavity.Wolff-Parkinson-White Syndrome: A form of ventricular pre-excitation characterized by a short PR interval and a long QRS interval with a delta wave. In this syndrome, atrial impulses are abnormally conducted to the HEART VENTRICLES via an ACCESSORY CONDUCTING PATHWAY that is located between the wall of the right or left atria and the ventricles, also known as a BUNDLE OF KENT. The inherited form can be caused by mutation of PRKAG2 gene encoding a gamma-2 regulatory subunit of AMP-activated protein kinase.Pulmonary Veins: The veins that return the oxygenated blood from the lungs to the left atrium of the heart.Tachycardia, Atrioventricular Nodal Reentry: Abnormally rapid heartbeats caused by reentry of atrial impulse into the dual (fast and slow) pathways of ATRIOVENTRICULAR NODE. The common type involves a blocked atrial impulse in the slow pathway which reenters the fast pathway in a retrograde direction and simultaneously conducts to the atria and the ventricles leading to rapid HEART RATE of 150-250 beats per minute.Tachycardia, Ectopic Atrial: Abnormally rapid heartbeats originating from one or more automatic foci (nonsinus pacemakers) in the HEART ATRIUM but away from the SINOATRIAL NODE. Unlike the reentry mechanism, automatic tachycardia speeds up and slows down gradually. The episode is characterized by a HEART RATE between 135 to less than 200 beats per minute and lasting 30 seconds or longer.Body Surface Potential Mapping: Recording of regional electrophysiological information by analysis of surface potentials to give a complete picture of the effects of the currents from the heart on the body surface. It has been applied to the diagnosis of old inferior myocardial infarction, localization of the bypass pathway in Wolff-Parkinson-White syndrome, recognition of ventricular hypertrophy, estimation of the size of a myocardial infarct, and the effects of different interventions designed to reduce infarct size. The limiting factor at present is the complexity of the recording and analysis, which requires 100 or more electrodes, sophisticated instrumentation, and dedicated personnel. (Braunwald, Heart Disease, 4th ed)Atrial Flutter: Rapid, irregular atrial contractions caused by a block of electrical impulse conduction in the right atrium and a reentrant wave front traveling up the inter-atrial septum and down the right atrial free wall or vice versa. Unlike ATRIAL FIBRILLATION which is caused by abnormal impulse generation, typical atrial flutter is caused by abnormal impulse conduction. As in atrial fibrillation, patients with atrial flutter cannot effectively pump blood into the lower chambers of the heart (HEART VENTRICLES).Tachycardia, Ventricular: An abnormally rapid ventricular rhythm usually in excess of 150 beats per minute. It is generated within the ventricle below the BUNDLE OF HIS, either as autonomic impulse formation or reentrant impulse conduction. Depending on the etiology, onset of ventricular tachycardia can be paroxysmal (sudden) or nonparoxysmal, its wide QRS complexes can be uniform or polymorphic, and the ventricular beating may be independent of the atrial beating (AV dissociation).Electrocardiography: Recording of the moment-to-moment electromotive forces of the HEART as projected onto various sites on the body's surface, delineated as a scalar function of time. The recording is monitored by a tracing on slow moving chart paper or by observing it on a cardioscope, which is a CATHODE RAY TUBE DISPLAY.Heart Conduction System: An impulse-conducting system composed of modified cardiac muscle, having the power of spontaneous rhythmicity and conduction more highly developed than the rest of the heart.Atrioventricular Node: A small nodular mass of specialized muscle fibers located in the interatrial septum near the opening of the coronary sinus. It gives rise to the atrioventricular bundle of the conduction system of the heart.Heart Atria: The chambers of the heart, to which the BLOOD returns from the circulation.Treatment Outcome: Evaluation undertaken to assess the results or consequences of management and procedures used in combating disease in order to determine the efficacy, effectiveness, safety, and practicability of these interventions in individual cases or series.Fluoroscopy: Production of an image when x-rays strike a fluorescent screen.Cardiac Catheters: Catheters inserted into various locations within the heart for diagnostic or therapeutic purposes.Ventricular Premature Complexes: A type of cardiac arrhythmia with premature contractions of the HEART VENTRICLES. It is characterized by the premature QRS complex on ECG that is of abnormal shape and great duration (generally >129 msec). It is the most common form of all cardiac arrhythmias. Premature ventricular complexes have no clinical significance except in concurrence with heart diseases.Recurrence: The return of a sign, symptom, or disease after a remission.Ablation Techniques: Removal of tissue by vaporization, abrasion, or destruction. Methods used include heating tissue by hot liquids or microwave thermal heating, freezing (CRYOABLATION), chemical ablation, and photoablation with LASERS.Tachycardia, Paroxysmal: Abnormally rapid heartbeats with sudden onset and cessation.Accessory Atrioventricular Bundle: Extra impulse-conducting tissue in the heart that creates abnormal impulse-conducting connections between HEART ATRIA and HEART VENTRICLES.Tachycardia, Sinoatrial Nodal Reentry: Abnormally rapid heartbeats caused by reentry circuit in or around the SINOATRIAL NODE. It is characterized by sudden onset and offset episodes of tachycardia with a HEART RATE of 100-150 beats per minute. The P wave is identical to the sinus P wave but with a longer PR interval.Tachycardia: Abnormally rapid heartbeat, usually with a HEART RATE above 100 beats per minute for adults. Tachycardia accompanied by disturbance in the cardiac depolarization (cardiac arrhythmia) is called tachyarrhythmia.Electrocoagulation: Procedures using an electrically heated wire or scalpel to treat hemorrhage (e.g., bleeding ulcers) and to ablate tumors, mucosal lesions, and refractory arrhythmias. It is different from ELECTROSURGERY which is used more for cutting tissue than destroying and in which the patient is part of the electric circuit.Follow-Up Studies: Studies in which individuals or populations are followed to assess the outcome of exposures, procedures, or effects of a characteristic, e.g., occurrence of disease.Surgery, Computer-Assisted: Surgical procedures conducted with the aid of computers. This is most frequently used in orthopedic and laparoscopic surgery for implant placement and instrument guidance. Image-guided surgery interactively combines prior CT scans or MRI images with real-time video.Catheterization: Use or insertion of a tubular device into a duct, blood vessel, hollow organ, or body cavity for injecting or withdrawing fluids for diagnostic or therapeutic purposes. It differs from INTUBATION in that the tube here is used to restore or maintain patency in obstructions.Cryosurgery: The use of freezing as a special surgical technique to destroy or excise tissue.Anti-Arrhythmia Agents: Agents used for the treatment or prevention of cardiac arrhythmias. They may affect the polarization-repolarization phase of the action potential, its excitability or refractoriness, or impulse conduction or membrane responsiveness within cardiac fibers. Anti-arrhythmia agents are often classed into four main groups according to their mechanism of action: sodium channel blockade, beta-adrenergic blockade, repolarization prolongation, or calcium channel blockade.Epicardial Mapping: Recording the locations and measurements of electrical activity in the EPICARDIUM by placing electrodes on the surface of the heart to analyze the patterns of activation and to locate arrhythmogenic sites.Cardiac Pacing, Artificial: Regulation of the rate of contraction of the heart muscles by an artificial pacemaker.Bundle of His: Small band of specialized CARDIAC MUSCLE fibers that originates in the ATRIOVENTRICULAR NODE and extends into the membranous part of the interventricular septum. The bundle of His, consisting of the left and the right bundle branches, conducts the electrical impulses to the HEART VENTRICLES in generation of MYOCARDIAL CONTRACTION.Pre-Excitation, Mahaim-Type: A form of ventricular pre-excitation characterized by a normal PR interval and a long QRS interval with an initial slow deflection (delta wave). In this syndrome, the atrial impulse travel to the ventricle via the MAHAIM FIBERS which connect ATRIOVENTRICULAR NODE directly to the right ventricle wall (NODOVENTRICULAR ACCESSORY PATHWAY) or to the RIGHT BUNDLE BRANCH OF HIS (nodofascicular accessory pathway).Tricuspid Valve: The valve consisting of three cusps situated between the right atrium and right ventricle of the heart.Catheterization, Central Venous: Placement of an intravenous CATHETER in the subclavian, jugular, or other central vein.Arrhythmias, Cardiac: Any disturbances of the normal rhythmic beating of the heart or MYOCARDIAL CONTRACTION. Cardiac arrhythmias can be classified by the abnormalities in HEART RATE, disorders of electrical impulse generation, or impulse conduction.Tachycardia, Ectopic Junctional: A rare form of supraventricular tachycardia caused by automatic, not reentrant, conduction initiated from sites at the atrioventricular junction, but not the ATRIOVENTRICULAR NODE. It usually occurs during myocardial infarction, after heart surgery, or in digitalis intoxication with a HEART RATE ranging from 140 to 250 beats per minute.Pericardium: A conical fibro-serous sac surrounding the HEART and the roots of the great vessels (AORTA; VENAE CAVAE; PULMONARY ARTERY). Pericardium consists of two sacs: the outer fibrous pericardium and the inner serous pericardium. The latter consists of an outer parietal layer facing the fibrous pericardium, and an inner visceral layer (epicardium) resting next to the heart, and a pericardial cavity between these two layers.Radio Waves: Electromagnetic waves with frequencies between about 3 kilohertz (very low frequency - VLF) and 300,000 megahertz (extremely high frequency - EHF). They are used in television and radio broadcasting, land and satellite communications systems, radionavigation, radiolocation, and DIATHERMY. The highest frequency radio waves are MICROWAVES.Pulmonary Veno-Occlusive Disease: Pathological process resulting in the fibrous obstruction of the small- and medium-sized PULMONARY VEINS and PULMONARY HYPERTENSION. Veno-occlusion can arise from fibrous proliferation of the VASCULAR INTIMA and VASCULAR MEDIA; THROMBOSIS; or a combination of both.Endocardium: The innermost layer of the heart, comprised of endothelial cells.Time Factors: Elements of limited time intervals, contributing to particular results or situations.Equipment Design: Methods of creating machines and devices.Radiography, Interventional: Diagnostic and therapeutic procedures that are invasive or surgical in nature, and require the expertise of a specially trained radiologist. In general, they are more invasive than diagnostic imaging but less invasive than major surgery. They often involve catheterization, fluoroscopy, or computed tomography. Some examples include percutaneous transhepatic cholangiography, percutaneous transthoracic biopsy, balloon angioplasty, and arterial embolization.Coronary Sinus: A short vein that collects about two thirds of the venous blood from the MYOCARDIUM and drains into the RIGHT ATRIUM. Coronary sinus, normally located between the LEFT ATRIUM and LEFT VENTRICLE on the posterior surface of the heart, can serve as an anatomical reference for cardiac procedures.Heart Block: Impaired conduction of cardiac impulse that can occur anywhere along the conduction pathway, such as between the SINOATRIAL NODE and the right atrium (SA block) or between atria and ventricles (AV block). Heart blocks can be classified by the duration, frequency, or completeness of conduction block. Reversibility depends on the degree of structural or functional defects.Heart Septum: This structure includes the thin muscular atrial septum between the two HEART ATRIA, and the thick muscular ventricular septum between the two HEART VENTRICLES.Electrocardiography, Ambulatory: Method in which prolonged electrocardiographic recordings are made on a portable tape recorder (Holter-type system) or solid-state device ("real-time" system), while the patient undergoes normal daily activities. It is useful in the diagnosis and management of intermittent cardiac arrhythmias and transient myocardial ischemia.Cardiac Catheterization: Procedures in which placement of CARDIAC CATHETERS is performed for therapeutic or diagnostic procedures.Feasibility Studies: Studies to determine the advantages or disadvantages, practicability, or capability of accomplishing a projected plan, study, or project.Atrial Function, Left: The hemodynamic and electrophysiological action of the LEFT ATRIUM.Prospective Studies: Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group.Tachycardia, Sinus: Simple rapid heartbeats caused by rapid discharge of impulses from the SINOATRIAL NODE, usually between 100 and 180 beats/min in adults. It is characterized by a gradual onset and termination. Sinus tachycardia is common in infants, young children, and adults during strenuous physical activities.Atrial Function, Right: The hemodynamic and electrophysiological action of the RIGHT ATRIUM.Central Venous Catheters: Catheters that are inserted into a large central vein such as a SUBCLAVIAN VEIN or FEMORAL VEIN.Electrophysiology: The study of the generation and behavior of electrical charges in living organisms particularly the nervous system and the effects of electricity on living organisms.Retrospective Studies: Studies used to test etiologic hypotheses in which inferences about an exposure to putative causal factors are derived from data relating to characteristics of persons under study or to events or experiences in their past. The essential feature is that some of the persons under study have the disease or outcome of interest and their characteristics are compared with those of unaffected persons.Atrial Premature Complexes: A type of cardiac arrhythmia with premature atrial contractions or beats caused by signals originating from ectopic atrial sites. The ectopic signals may or may not conduct to the HEART VENTRICLES. Atrial premature complexes are characterized by premature P waves on ECG which are different in configuration from the P waves generated by the normal pacemaker complex in the SINOATRIAL NODE.Esophageal Fistula: Abnormal passage communicating with the ESOPHAGUS. The most common type is TRACHEOESOPHAGEAL FISTULA between the esophagus and the TRACHEA.Cardiac Complexes, Premature: A group of cardiac arrhythmias in which the cardiac contractions are not initiated at the SINOATRIAL NODE. They include both atrial and ventricular premature beats, and are also known as extra or ectopic heartbeats. Their frequency is increased in heart diseases.Azygos Vein: A vein which arises from the right ascending lumbar vein or the vena cava, enters the thorax through the aortic orifice in the diaphragm, and terminates in the superior vena cava.Electrodes: Electric conductors through which electric currents enter or leave a medium, whether it be an electrolytic solution, solid, molten mass, gas, or vacuum.Atrial Appendage: Ear-shaped appendage of either atrium of the heart. (Dorland, 28th ed)Catheterization, Peripheral: Insertion of a catheter into a peripheral artery, vein, or airway for diagnostic or therapeutic purposes.Therapeutic Irrigation: The washing of a body cavity or surface by flowing water or solution for therapy or diagnosis.Urinary Catheterization: Passage of a CATHETER into the URINARY BLADDER or kidney.Atrial Septum: The thin membrane-like muscular structure separating the right and the left upper chambers (HEART ATRIA) of a heart.Heart Injuries: General or unspecified injuries to the heart.Cicatrix: The fibrous tissue that replaces normal tissue during the process of WOUND HEALING.Echocardiography, Transesophageal: Ultrasonic recording of the size, motion, and composition of the heart and surrounding tissues using a transducer placed in the esophagus.Heart Ventricles: The lower right and left chambers of the heart. The right ventricle pumps venous BLOOD into the LUNGS and the left ventricle pumps oxygenated blood into the systemic arterial circulation.Vena Cava, Superior: The venous trunk which returns blood from the head, neck, upper extremities and chest.Cardiac Imaging Techniques: Visualization of the heart structure and cardiac blood flow for diagnostic evaluation or to guide cardiac procedures via techniques including ENDOSCOPY (cardiac endoscopy, sometimes refered to as cardioscopy), RADIONUCLIDE IMAGING; MAGNETIC RESONANCE IMAGING; TOMOGRAPHY; or ULTRASONOGRAPHY.Cardiac Electrophysiology: The study of the electrical activity and characteristics of the HEART; MYOCARDIUM; and CARDIOMYOCYTES.Burns, Electric: Burns produced by contact with electric current or from a sudden discharge of electricity.Imaging, Three-Dimensional: The process of generating three-dimensional images by electronic, photographic, or other methods. For example, three-dimensional images can be generated by assembling multiple tomographic images with the aid of a computer, while photographic 3-D images (HOLOGRAPHY) can be made by exposing film to the interference pattern created when two laser light sources shine on an object.Ebstein Anomaly: A congenital heart defect characterized by downward or apical displacement of the TRICUSPID VALVE, usually with the septal and posterior leaflets being attached to the wall of the RIGHT VENTRICLE. It is characterized by a huge RIGHT ATRIUM and a small and less effective right ventricle.Urinary Catheters: Catheters inserted into the URINARY BLADDER or kidney for therapeutic or diagnostic purposes.Postoperative Complications: Pathologic processes that affect patients after a surgical procedure. They may or may not be related to the disease for which the surgery was done, and they may or may not be direct results of the surgery.Electric Countershock: An electrical current applied to the HEART to terminate a disturbance of its rhythm, ARRHYTHMIAS, CARDIAC. (Stedman, 25th ed)Equipment Failure: Failure of equipment to perform to standard. The failure may be due to defects or improper use.Ventricular Septum: The muscular structure separating the right and the left lower chambers (HEART VENTRICLES) of the heart. The ventricular septum consists of a very small membranous portion just beneath the AORTIC VALVE, and a large thick muscular portion consisting of three sections including the inlet septum, the trabecular septum, and the outlet septum.Sinus of Valsalva: The dilatation of the aortic wall behind each of the cusps of the aortic valve.Sinoatrial Node: The small mass of modified cardiac muscle fibers located at the junction of the superior vena cava (VENA CAVA, SUPERIOR) and right atrium. Contraction impulses probably start in this node, spread over the atrium (HEART ATRIUM) and are then transmitted by the atrioventricular bundle (BUNDLE OF HIS) to the ventricle (HEART VENTRICLE).Vena Cava, Inferior: The venous trunk which receives blood from the lower extremities and from the pelvic and abdominal organs.Echocardiography: Ultrasonic recording of the size, motion, and composition of the heart and surrounding tissues. The standard approach is transthoracic.Pre-Excitation Syndromes: A group of conditions in which HEART VENTRICLE activation by the atrial impulse is faster than the normal impulse conduction from the SINOATRIAL NODE. In these pre-excitation syndromes, atrial impulses often bypass the ATRIOVENTRICULAR NODE delay and travel via ACCESSORY CONDUCTING PATHWAYS connecting the atrium directly to the BUNDLE OF HIS.Ventricular Fibrillation: A potentially lethal cardiac arrhythmia that is characterized by uncoordinated extremely rapid firing of electrical impulses (400-600/min) in HEART VENTRICLES. Such asynchronous ventricular quivering or fibrillation prevents any effective cardiac output and results in unconsciousness (SYNCOPE). It is one of the major electrocardiographic patterns seen with CARDIAC ARREST.Predictive Value of Tests: In screening and diagnostic tests, the probability that a person with a positive test is a true positive (i.e., has the disease), is referred to as the predictive value of a positive test; whereas, the predictive value of a negative test is the probability that the person with a negative test does not have the disease. Predictive value is related to the sensitivity and specificity of the test.Pacemaker, Artificial: A device designed to stimulate, by electric impulses, contraction of the heart muscles. It may be temporary (external) or permanent (internal or internal-external).Ultrasonography, Interventional: The use of ultrasound to guide minimally invasive surgical procedures such as needle ASPIRATION BIOPSY; DRAINAGE; etc. Its widest application is intravascular ultrasound imaging but it is useful also in urology and intra-abdominal conditions.Anticoagulants: Agents that prevent clotting.Catheter-Related Infections: Infections resulting from the use of catheters. Proper aseptic technique, site of catheter placement, material composition, and virulence of the organism are all factors that can influence possible infection.Reoperation: A repeat operation for the same condition in the same patient due to disease progression or recurrence, or as followup to failed previous surgery.Defibrillators, Implantable: Implantable devices which continuously monitor the electrical activity of the heart and automatically detect and terminate ventricular tachycardia (TACHYCARDIA, VENTRICULAR) and VENTRICULAR FIBRILLATION. They consist of an impulse generator, batteries, and electrodes.Atrioventricular Block: Impaired impulse conduction from HEART ATRIA to HEART VENTRICLES. AV block can mean delayed or completely blocked impulse conduction.Heart Diseases: Pathological conditions involving the HEART including its structural and functional abnormalities.Cardiac Tamponade: Compression of the heart by accumulated fluid (PERICARDIAL EFFUSION) or blood (HEMOPERICARDIUM) in the PERICARDIUM surrounding the heart. The affected cardiac functions and CARDIAC OUTPUT can range from minimal to total hemodynamic collapse.Cardiac Surgical Procedures: Surgery performed on the heart.High-Intensity Focused Ultrasound Ablation: The use of focused, high-frequency sound waves to destroy tissue. It is sometimes used in conjunction with but is distinct from INTERVENTIONAL ULTRASONOGRAPHY.Punctures: Incision of tissues for injection of medication or for other diagnostic or therapeutic procedures. Punctures of the skin, for example may be used for diagnostic drainage; of blood vessels for diagnostic imaging procedures.Robotics: The application of electronic, computerized control systems to mechanical devices designed to perform human functions. Formerly restricted to industry, but nowadays applied to artificial organs controlled by bionic (bioelectronic) devices, like automated insulin pumps and other prostheses.Mitral Valve: The valve between the left atrium and left ventricle of the heart.Cardiomyopathies: A group of diseases in which the dominant feature is the involvement of the CARDIAC MUSCLE itself. Cardiomyopathies are classified according to their predominant pathophysiological features (DILATED CARDIOMYOPATHY; HYPERTROPHIC CARDIOMYOPATHY; RESTRICTIVE CARDIOMYOPATHY) or their etiological/pathological factors (CARDIOMYOPATHY, ALCOHOLIC; ENDOCARDIAL FIBROELASTOSIS).Pericardial Effusion: Fluid accumulation within the PERICARDIUM. Serous effusions are associated with pericardial diseases. Hemopericardium is associated with trauma. Lipid-containing effusion (chylopericardium) results from leakage of THORACIC DUCT. Severe cases can lead to CARDIAC TAMPONADE.Atrial Function: The hemodynamic and electrophysiological action of the HEART ATRIA.Monitoring, Intraoperative: The constant checking on the state or condition of a patient during the course of a surgical operation (e.g., checking of vital signs).Thromboembolism: Obstruction of a blood vessel (embolism) by a blood clot (THROMBUS) in the blood stream.Dextrocardia: A congenital defect in which the heart is located on the right side of the THORAX instead of on the left side (levocardia, the normal position). When dextrocardia is accompanied with inverted HEART ATRIA, a right-sided STOMACH, and a left-sided LIVER, the combination is called dextrocardia with SITUS INVERSUS. Dextrocardia may adversely affect other thoracic organs.Tomography, X-Ray Computed: Tomography using x-ray transmission and a computer algorithm to reconstruct the image.Risk Assessment: The qualitative or quantitative estimation of the likelihood of adverse effects that may result from exposure to specified health hazards or from the absence of beneficial influences. (Last, Dictionary of Epidemiology, 1988)Metaproterenol: A beta-2 adrenergic agonist used in the treatment of ASTHMA and BRONCHIAL SPASM.Arrhythmogenic Right Ventricular Dysplasia: A congenital cardiomyopathy that is characterized by infiltration of adipose and fibrous tissue into the RIGHT VENTRICLE wall and loss of myocardial cells. Primary injuries usually are at the free wall of right ventricular and right atria resulting in ventricular and supraventricular arrhythmias.Chi-Square Distribution: A distribution in which a variable is distributed like the sum of the squares of any given independent random variable, each of which has a normal distribution with mean of zero and variance of one. The chi-square test is a statistical test based on comparison of a test statistic to a chi-square distribution. The oldest of these tests are used to detect whether two or more population distributions differ from one another.Thermoluminescent Dosimetry: The use of a device composed of thermoluminescent material for measuring exposure to IONIZING RADIATION. The thermoluminescent material emits light when heated. The amount of light emitted is proportional to the amount of ionizing radiation to which the material has been exposed.Xiphoid Bone: Also called xiphoid process, it is the smallest and most inferior triangular protrusion of the STERNUM or breastbone that extends into the center of the ribcage.Bundle-Branch Block: A form of heart block in which the electrical stimulation of HEART VENTRICLES is interrupted at either one of the branches of BUNDLE OF HIS thus preventing the simultaneous depolarization of the two ventricles.Risk Factors: An aspect of personal behavior or lifestyle, environmental exposure, or inborn or inherited characteristic, which, on the basis of epidemiologic evidence, is known to be associated with a health-related condition considered important to prevent.Magnetics: The study of MAGNETIC PHENOMENA.Dogs: The domestic dog, Canis familiaris, comprising about 400 breeds, of the carnivore family CANIDAE. They are worldwide in distribution and live in association with people. (Walker's Mammals of the World, 5th ed, p1065)Situs Inversus: A congenital abnormality in which organs in the THORAX and the ABDOMEN are opposite to their normal positions (situs solitus) due to lateral transposition. Normally the STOMACH and SPLEEN are on the left, LIVER on the right, the three-lobed right lung is on the right, and the two-lobed left lung on the left. Situs inversus has a familial pattern and has been associated with a number of genes related to microtubule-associated proteins.Safety: Freedom from exposure to danger and protection from the occurrence or risk of injury or loss. It suggests optimal precautions in the workplace, on the street, in the home, etc., and includes personal safety as well as the safety of property.Autonomic Pathways: Nerves and plexuses of the autonomic nervous system. The central nervous system structures which regulate the autonomic nervous system are not included.Heart Rate: The number of times the HEART VENTRICLES contract per unit of time, usually per minute.Laser Therapy: The use of photothermal effects of LASERS to coagulate, incise, vaporize, resect, dissect, or resurface tissue.Atrial Remodeling: Long-term changes in the electrophysiological parameters and/or anatomical structures of the HEART ATRIA that result from prolonged changes in atrial rate, often associated with ATRIAL FIBRILLATION or long periods of intense EXERCISE.Treatment Failure: A measure of the quality of health care by assessment of unsuccessful results of management and procedures used in combating disease, in individual cases or series.Phlebography: Radiographic visualization or recording of a vein after the injection of contrast medium.Warfarin: An anticoagulant that acts by inhibiting the synthesis of vitamin K-dependent coagulation factors. Warfarin is indicated for the prophylaxis and/or treatment of venous thrombosis and its extension, pulmonary embolism, and atrial fibrillation with embolization. It is also used as an adjunct in the prophylaxis of systemic embolism after myocardial infarction. Warfarin is also used as a rodenticide.Ventricular Outflow Obstruction: Occlusion of the outflow tract in either the LEFT VENTRICLE or the RIGHT VENTRICLE of the heart. This may result from CONGENITAL HEART DEFECTS, predisposing heart diseases, complications of surgery, or HEART NEOPLASMS.Kaplan-Meier Estimate: A nonparametric method of compiling LIFE TABLES or survival tables. It combines calculated probabilities of survival and estimates to allow for observations occurring beyond a measurement threshold, which are assumed to occur randomly. Time intervals are defined as ending each time an event occurs and are therefore unequal. (From Last, A Dictionary of Epidemiology, 1995)Swine: Any of various animals that constitute the family Suidae and comprise stout-bodied, short-legged omnivorous mammals with thick skin, usually covered with coarse bristles, a rather long mobile snout, and small tail. Included are the genera Babyrousa, Phacochoerus (wart hogs), and Sus, the latter containing the domestic pig (see SUS SCROFA).Constriction, Pathologic: The condition of an anatomical structure's being constricted beyond normal dimensions.Foreign-Body Migration: Migration of a foreign body from its original location to some other location in the body.

Frequency and long term follow up of valvar insufficiency caused by retrograde aortic radiofrequency catheter ablation procedures. (1/3420)

OBJECTIVE: To assess the frequency of valvar complications caused by left sided radiofrequency catheter ablation using the retrograde aortic technique. METHODS: 179 patients (118 male) with a mean (SD) age of 43 (17) years underwent 216 procedures at one centre. The target of the ablation was an accessory atrioventricular pathway in 144 patients, the atrioventricular junction in 29 patients, and a ventricular tachycardia in six patients. In 25 patients structural heart disease was identified before the procedure (ischaemic heart disease 10, cardiomyopathy nine, valvar three, other three). Echo/Doppler examinations were performed the day before the procedure and within 24 hours postablation; the investigations were all reviewed by the same investigator. Patients with identified valvar injury caused by the procedure were followed for 42 (7) months. RESULTS: Valvar injury caused by the ablation procedure was identified in four young (age 30 (8) years), otherwise healthy patients with left lateral atrioventricular accessory pathways. Mild mitral insufficiency with a central regurgitation jet was detected in two patients and remained unchanged at follow up. Mild aortic insufficiency was detected in another two patients. In one of these the regurgitation jet was central and remained unchanged at follow up. In one patient the regurgitation jet was located between the non-coronary and left cusps in relation to a loosely attached structure. Both the structure and the valvar regurgitation disappeared during follow up. No clinical complications occurred in any of the patients during follow up. CONCLUSION: In this study, the frequency of valvar complications after left sided radiofrequency catheter ablation using the retrograde aortic technique was 1.9%.  (+info)

AV reentrant and idiopathic ventricular double tachycardias: complicated interactions between two tachycardias. (2/3420)

An electrophysiological study was performed in a 61 year old man with Wolff- Parkinson-White (WPW) syndrome. At baseline, neither ventricular nor supraventricular tachycardias could be induced. During isoprenaline infusion, ventricular tachycardia originating from the right ventricular outflow tract (RVOT) with a cycle length of 280 ms was induced and subsequently atrioventricular reentrant tachycardia (AVRT) with a cycle length of 300 ms using an accessory pathway in the left free wall appeared. During these tachycardias, AVRT was entrained by ventricular tachycardia. The earliest ventricular activation site during the ventricular tachycardia was determined to be the RVOT site and a radiofrequency current at 30 W successfully ablated the ventricular tachycardia at this site. The left free wall accessory pathway was also successfully ablated during right ventricular pacing. The coexistence of WPW syndrome and cathecolamine sensitive ventricular tachycardia originating from the RVOT has rarely been reported. Furthermore, the tachycardias were triggered by previous tachycardias.  (+info)

Tachycardia induced tachycardia: case report of right ventricular outflow tract tachycardia and AV nodal reentrant tachycardia. (3/3420)

Tachycardia induced tachycardia, or so called double tachycardia, is rare. A 34 year old woman is described who had a history of syncope, frequent extrasystoles, and episodes of non-sustained ventricular tachycardia, perceived as palpitation, without syncope. At electrophysiological study, during infusion of isoprenaline, an episode of non-sustained ventricular tachycardia arising from the right ventricular outflow tract initiated sustained atrioventricular nodal reentrant tachycardia, thought to be the cause of the patient's syncope. Ablation of the right ventricular outflow tract focus abolished the ventricular ectopy; the slow AV nodal pathway was also ablated. The patient no longer has either syncope or palpitation.  (+info)

Clinical application of an integrated 3-phase mapping technique for localization of the site of origin of idiopathic ventricular tachycardia. (4/3420)

BACKGROUND: Radiofrequency (RF) catheter ablation provides curative treatment for idiopathic ventricular tachycardia (VT). METHODS AND RESULTS: Nineteen consecutive patients with an idiopathic VT underwent RF catheter ablation. An integrated 3-phase mapping approach was used, consisting of the successive application of online 62-lead body surface QRS integral mapping, directed regional paced body surface QRS integral mapping, and local activation sequence mapping. Mapping phase 1 was localization of the segment of VT origin by comparing the VT QRS integral map with a database of mean paced QRS integral maps. Mapping phase 2 was body surface pace mapping during sinus rhythm in the segment localized in phase 1 until the site at which the paced QRS integral map matched the VT QRS integral map was identified (ie, VT exit site). Mapping phase 3 was local activation sequence mapping at the circumscribed area identified in phase 2 to identify the site with the earliest local endocardial activation (ie, site of VT origin). This site became the ablation target. Ten VTs were ablated in the right ventricular outflow tract, 2 at the basal LV septum, and 7 at the midapical posterior left ventricle. A high long-term ablation success (mean follow-up duration, 14+/-9 months) was achieved in 17 of the 19 patients (89%) with a low number of RF pulses (mean, 3.3+/-2.2 pulses per patient). CONCLUSIONS: This prospective study shows that integrated 3-phase mapping for localization of the site of origin of idiopathic VT offers efficient and accurate localization of the target site for RF catheter ablation.  (+info)

LocaLisa: new technique for real-time 3-dimensional localization of regular intracardiac electrodes. (5/3420)

BACKGROUND: Estimation of the 3-dimensional (3D) position of ablation electrodes from fluoroscopic images is inadequate if a systematic lesion pattern is required in the treatment of complex arrhythmogenic substrates. METHODS AND RESULTS: We developed a new technique for online 3D localization of intracardiac electrodes. Regular catheter electrodes are used as sensors for a high-frequency transthoracic electrical field, which is applied via standard skin electrodes. We investigated localization accuracy within the right atrium, right ventricle, and left ventricle by comparing measured and true interelectrode distances of a decapolar catheter. Long-term stability was analyzed by localization of the most proximal His bundle before and after slow pathway ablation. Electrogram recordings were unaffected by the applied electrical field. Localization data from 3 catheter positions, widely distributed within the right atrium, right ventricle, or left ventricle, were analyzed in 10 patients per group. The relationship between measured and true electrode positions was highly linear, with an average correlation coefficient of 0.996, 0.997, and 0.999 for the right atrium, right ventricle, and left ventricle, respectively. Localization accuracy was better than 2 mm, with an additional scaling error of 8% to 14%. After 2 hours, localization of the proximal His bundle was reproducible within 1.4+/-1.1 mm. CONCLUSIONS: This new technique enables accurate and reproducible real-time localization of electrode positions in cardiac mapping and ablation procedures. Its application does not distort the quality of electrograms and can be applied to any electrode catheter.  (+info)

Atrioventricular nodal ablation and implantation of mode switching dual chamber pacemakers: effective treatment for drug refractory paroxysmal atrial fibrillation. (6/3420)

OBJECTIVE: To assess the effect of atrioventricular node ablation and implantation of a dual chamber, mode switching pacemaker on quality of life, exercise capacity, and left ventricular systolic function in patients with drug refractory paroxysmal atrial fibrillation. PATIENTS: 18 consecutive patients with drug refractory paroxysmal atrial fibrillation. METHODS: Quality of life was assessed before and after the procedure using the psychological general wellbeing index (PGWB), the McMaster health index (MHI), and a visual analogue scale for cardiac symptoms. Nine of the patients also underwent symptom limited exercise tests and echocardiography to assess left ventricular systolic function. RESULTS: The procedure allowed a reduction in antiarrhythmic drug treatment (p < 0.01). PGWB and symptom scores improved (p < 0.01) but the MHI score did not change. Left ventricular systolic function and exercise capacity were unchanged. CONCLUSIONS: Atrioventricular node ablation and implantation of a DDDR/MS pacemaker is effective treatment for refractory paroxysmal atrial fibrillation, producing improved quality of life while allowing a reduction in drug burden. The popularity of the treatment is justified, but further studies are needed to determine optimum timing of intervention.  (+info)

Predictors of atrial rhythm after atrioventricular node ablation for the treatment of paroxysmal atrial arrhythmias. (7/3420)

OBJECTIVE: To assess the natural history of the atrial rhythm of patients with paroxysmal atrial arrhythmias undergoing atrioventricular node ablation and permanent pacemaker implantation. DESIGN AND SETTING: A retrospective cohort study of consecutive patients identified from the pacemaker database and electrophysiology records of a tertiary referral hospital. PATIENTS: 62 consecutive patients with paroxysmal atrial arrhythmias undergoing atrioventricular node ablation and permanent pacemaker implantation between 1988 and July 1996. MAIN OUTCOME MEASURES: (1) Atrial rhythm on final follow up ECG, classified as either ordered (sinus rhythm or atrial pacing) or disordered (atrial fibrillation, atrial flutter or atrial tachycardia). (2) Chronic atrial fibrillation, defined as a disordered rhythm on two consecutive ECGs (or throughout a 24 hour Holter recording) with no ordered rhythm subsequently documented. RESULTS: Survival analysis showed that 75% of patients progressed to chronic atrial fibrillation by 2584 days (86 months). On multiple logistic regression analysis a history of electrical cardioversion, increasing patient age, and VVI pacing were associated with the development of chronic atrial fibrillation. A history of electrical cardioversion and increasing patient age were associated with a disordered atrial rhythm on the final follow up ECG. CONCLUSIONS: Patients with paroxysmal atrial arrhythmias are at high risk of developing chronic atrial fibrillation. A history of direct current cardioversion.  (+info)

Recovery pattern of left ventricular dysfunction following radiofrequency ablation of incessant supraventricular tachycardia in infants and children. (8/3420)

OBJECTIVE: To assess recovery pattern of left ventricular function secondary to incessant tachycardia after radiofrequency ablation in a group of infants and children. DESIGN AND SETTING: A combined prospective and retrospective echocardiographic study carried out in a tertiary paediatric cardiac centre. PATIENTS: Echocardiographic evaluation of left ventricular size and function in nine children with incessant tachycardia, before and after successful radiofrequency ablation. Age at ablation ranged from 2 months to 12.5 years (mean 4.1 years). Recovery of left ventricular function was analysed in relation to age at ablation (group I < 18 months, group II > 18 months). MAIN OUTCOME MEASURE: Ventricular recovery pattern. RESULTS: Seven of the nine children had left ventricular dysfunction; six of these also had left ventricular dilatation. All children with left ventricular dysfunction had normalisation of ejection fraction and fractional shortening; left ventricular dilatation also improved, but the improvement occurred after recovery of function. There was a shorter recovery time for left ventricular function in younger (group I) than in older children (group II) (mean (SD) 5.7 (7.2) months v 31.3 (5.2) (p < 0.002). CONCLUSIONS: Tachycardia induced cardiomyopathy is reversible following curative treatment with radiofrequency. Recovery of left ventricular systolic function precedes recovery of left ventricular dilatation. Time course to recovery is shorter in younger children.  (+info)

Damage to the coronary artery is a rare but important complication following radiofrequency catheter ablation. This case report describes the management of circumflex artery occlusion following mitral isthmus ablation in a 62-year-old male. It also provides a brief literature review and discusses the clinical implications of this complication.
INTENDED USE/INDICATIONS FOR USE. The Maestro 4000 Cardiac Ablation System is intended for use with BSC cardiac ablation catheters in cardiac ablation procedures.. Note: Refer to the individual catheter Directions for Use for catheter compatibility to the Maestro 4000 Cardiac Ablation System. It is also important to carefully review the specific indications, contraindications, warnings, precautions and adverse events included with each catheter, prior to use of the catheter with the Maestro 4000 Cardiac Ablation System.. CONTRAINDICATIONS. There are no specific contraindications for use of the Maestro 4000 Cardiac Ablation System itself. However, users should read and understand the specific indications, contraindications, warnings, and precautions included with any cardiac ablation catheter used in conjunction with the System.. Note: The contraindications listed in the catheter Directions For Use also apply to the use of the Maestro 4000 Cardiac Ablation System. Carefully review the specific ...
Successful Anesthetic Management for Surgical Repair of Atrio-Esophageal Fistula Following Radiofrequency Ablation for Atrial Fibrillation. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.
TY - JOUR. T1 - Liver abscess after percutaneous radiofrequency ablation for hepatocellular carcinomas. T2 - Frequency and risk factors. AU - Choi, Dongil. AU - Lim, Hyo K.. AU - Kim, Min Ju. AU - Kim, Suk Jung. AU - Kim, Seung Hoon. AU - Lee, Won Jae. AU - Lim, Jae Hoon. AU - Paik, Seung Woon. AU - Yoo, Byung Chul. AU - Choi, Moon Seok. AU - Kim, Seonwoo. PY - 2005/1/1. Y1 - 2005/1/1. N2 - OBJECTIVE. The purpose of this study was to clarify the frequency and risk factors of liver abscess formation after percutaneous radiofrequency ablation in patients with hepatocellular carcinoma. MATERIALS AND METHODS. Over a 4-year period, 603 patients with 831 hepatocellular carcinomas measuring 5 cm or less in maximum diameter who underwent a total of 751 percutaneous radiofrequency ablation procedures were enrolled in this study. We retrospectively reviewed the medical records and analyzed the overall frequency of liver abscess, risk factors for abscess, and clinical features of the patients. The ...
References: Symptomatic improvement after radiofrequency catheter ablation for typical atrial flutter; Heart 2001;86:167-171 Quality-of-Life in Patients With Paroxysmal Atrial Fibrillation After Catheter Ablation: Results of Long-Term Follow-Up; PACE 2003; 26:678-684 Quality of life restored to normal in patients with atrial fibrillation after pulmonary vein ostial Isolation; Am Heart J 2004;148:318-25 Effect of Left Atrial Ablation on the Quality of Life in Patients With Atrial Fibrillation; Circ J 2008; 72: 582-587 Catheter Ablation for Atrial Fibrillation in Congestive Heart Failure; N Engl J Med 2004;351:2373-83. Effects of Radiofrequency Catheter Ablation on Quality of Life in Patients With Atrial Flutter; Am J Cardiol 1999;84:278-283 Radiofrequency Catheter Ablation of Common Atrial Flutter : Significance of Palpitations and Quality-of-Life Evaluation in Patients With Proven Isthmus Block; Circulation 1999;99;534-540 Relationship Between Atrial Fibrillation and Typical Atrial Flutter in ...
Headline: Bitcoin & Blockchain Searches Exceed Trump! Blockchain Stocks Are Next!. The Ablation Technologies Market report covers detailed competitive outlook including the market share and company profiles of the key participants operating in the global market.. Worldwide Ablation Technologies Market 2022, presents critical information and factual data about the Ablation Technologies Market globally, providing an overall statistical study of the Ablation Technologies Market on the basis of market drivers, Ablation Technologies Market limitations, and its future prospects. The prevalent global Ablation Technologies trends and opportunities are also taken into consideration in Ablation Technologies Market study.. Global Ablation Technologies Market 2022 report has Forecasted Compound Annual Growth Rate (CAGR) in % value for particular period for Ablation Technologies Market, that will help user to take decision based on futuristic chart. Report also includes key players in global Ablation ...
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OBJECTIVE: To evaluate the indications, results and complications of radiofrequency catheter ablation in small infants with supraventricular tachycardia due to an accessory atrioventricular pathway. METHODS: Five infants less than 9 months old underwent radiofrequency catheter ablation of accessory pathways. Ablation was done for medically refractory tachyarrhythmia associated with aborted sudden death in two patients, left ventricular dysfunction in one, failure of antiarrhythmic drugs in one, and planned cardiac surgery in one. All five patients underwent a single successful procedure. Three left free wall pathways were ablated by transseptal approach, a right posteroseptal pathway was ablated from the inferior vena cava, and a left posteroseptal pathway was approached from the inferior vena cava into the coronary sinus. A deflectable 5F bipolar electrode catheter with a 3 mm tip was used. RESULTS: A sudden increment in impedance indicative of coagulum formation was observed in two procedures. ...
This report describes successful radiofrequency ablation of an accessory pathway in a situation with no identifiable AV valve ring. Mapping and ablation of accessory pathways are performed where they cross the fibrous AV valve ring, which provides purchase for the catheter and lessens the degree of myocardial injury. Precise localisation of a well defined AV ring may be a problem in patients with Ebsteins disease4 and possibly in patients with an unguarded tricuspid orifice.. Pulmonary atresia, intact ventricular septum with complete absence of tricuspid valve tissue, is an extremely rare lesion that was first described in a pathological specimen by Klein in 1938.7Anderson et al differentiates a true unguarded orifice from the much more common Ebsteins anomaly on the basis of presence or absence of the mural leaflet of the tricuspid valve.6The three necropsy cases they described all had a dilated right ventricle. Using echocardiography and angiography, further cases have been described usually ...
Mitral isthmus ablation forms part of the electrophysiologists armoury in the catheter ablation treatment of atrial fibrillation. It is well recognised however, that mitral isthmus ablation is technically challenging and incomplete ablation may be pro-arrhythmic, leading some to question its role. This article first reviews the evidence for the use of adjunctive mitral isthmus ablation and its association with the development of macroreentrant perimitral flutter. It then describes the practical techniques of mitral isthmus ablation, with particular emphasis on the assessment of bi-directional mitral isthmus block. The anatomy of the mitral isthmus is also discussed in order to understand the possible obstacles to successful ablation. Finally, novel techniques which may facilitate mitral isthmus ablation are reviewed.
Mitral isthmus is often targeted as a part of stepwise approach during radiofrequency ablation for persistent atrial ablation. Acute success rate in achieving the mitral isthmus block is only modest, late reconduction rate is relatively high and, consequently, incomplete lesion may be proarrhythmic. We describe the first-in-man experience with successful MI ablation by bipolar RF energy delivery. A 64-year-old caucasian man after two previous ablation procedures for drug resistant atrial fibrillation in recent four years, which included pulmonary vein isolation and linear left atrial lesions, was referred for the treatment of recurrent perimitral flutter. Despite the third attempt to create bidirectional block at the mitral isthmus region, we were not even able to stop the arrhythmia by aggressive unipolar radiofrequency ablation both from the left atrium and coronary sinus, because of deeply embedded slow conducting channel probably around the vein of Marshall. Arrhythmia was finally terminated and the
Background- Segmental ostial catheter ablation (SOCA) to isolate the pulmonary veins (PVs) and left atrial catheter ablation (LACA) to encircle the PVs both may eliminate paroxysmal atrial fibrillation (PAF). The relative efficacy of these 2 techniques has not been directly compared.. Methods and Results- Of 80 consecutive patients with symptomatic PAF (age, 52±10 years), 40 patients underwent PV isolation by SOCA and 40 patients underwent LACA to encircle the PVs. During SOCA, ostial PV potentials recorded with a ring catheter were targeted. LACA was performed by encircling the left- and right-sided PVs 1 to 2 cm from the ostia and was guided by an electroanatomic mapping system; ablation lines also were created in the mitral isthmus and posterior left atrium. The mean procedure and fluoroscopy times were 156±45 and 50±17 minutes for SOCA and 149±33 and 39±12 minutes for LACA, respectively. At 6 months, 67% of patients who underwent SOCA and 88% of patients who underwent LACA were free of ...
This is a multi-center, observational, 1-year prospective cohort study (1 year follow-up, at 3, 6 and 12 month) with approximately 675 participants. We will conduct a thorough outcomes assessment utilizing data from Magnetic Resonance Imaging (MRI) scans, as well as pre-procedure and follow-up data. Scans will be blinded to location of participating site. MRI scans will be sequenced and analyzed as they arrive from the database.. Imaging Protocol: All patients will undergo a Delayed-Enhancement MRI (DE-MRI) within 30 days prior to the atrial fibrillation (AF) ablation procedure. The purpose of the initial MRI is to quantify the degree of atrial structural remodeling or fibrosis pre-ablation. Following ablation, DE-MRI will be obtained at 3, 6, and 12 months follow-up to detect and quantify ablation-related scar formation.. Clinical Follow-up: The institution where the ablation was performed will continue post-procedural care following standard of care procedures.. Atrial arrhythmia recurrences ...
TY - JOUR. T1 - Effect of radiofrequency ablation on atrial mechanical function in patients with atrial flutter. AU - Welch, Patrick J.. AU - Afridi, Imran. AU - Joglar, Jose A.. AU - Sheehan, Clifford J.. AU - Zagrodzky, Jason D.. AU - Abraham, Theodore P.. AU - Page, Richard L.. AU - Hamdan, Mohamed H.. PY - 1999/8/15. Y1 - 1999/8/15. N2 - Atrial stunning, as assessed by left atrial appendage emptying and increased spontaneous echo contrast, is known to occur following direct- current cardioversion of atrial fibrillation (AF) and atrial flutter (AFI). Little is known on atrial mechanical function and the time course of atrial recovery following radiofrequency ablation of AFI. Fourteen patients undergoing radiofrequency ablation of persistent typical counterclockwise AFI were enrolled. Two-dimensional and pulse Doppler transesophageal echocardiography (TEE) were performed before ablation and immediately following restoration of sinus rhythm. Left atrial spontaneous echo contrast grades, left ...
Evidence-based recommendations on endoscopic bipolar radiofrequency ablation for biliary obstruction caused by bile duct and pancreas cancers..
Abstract:. Ventricular tachycardia (VT) is one of the major causes of sudden cardiac death (SCD). In general, VT could be managed with antiarrhythmic drugs (AADs) therapy, catheter ablation and implantable cardioverter defibrillators (ICD). While the AADs therapy and catheter ablation have been shown to reduce the recurrence of VT, only the ICD therapy is effective in aborting SCD. The recently published VANISH trial reveals that VT catheter ablation significantly decreases the rate of death, VT storm and appropriate ICD shock comparing with an escalation of AADs therapy for ischemic cardiomyopathy (ICM). However, the mapping strategies and feasibility of VT catheter ablation are often limited by the hemodynamically intolerant VT. Substrate modification strategy and percutaneous left ventricular assist device (pLVAD) are often used to overcome the hemodynamic intolerance. So far there are no large-scale randomized clinical trials comparing different mapping strategies in the setting of ...
The global Ablation Technology Market is primarily driven by high incidence of chronic illnesses, such as cancer. Rising cancer cases fuel the need for minimally invasive procedures for diagnostics purposes. Surgical removal of body tissues is carried out by minimally invasive procedures. These procedures employ ablation technologies. Besides being economical, ablation technologies ensure quick recovery and cause lesser damage to body tissues. They also ensure lower risks of infection.. Favorable government initiatives and a rapidly growing geriatric population are factors that positively impact demand. Owing to high success rates in diagnosis of chronic illnesses and minimal risks, developing economies, such as Brazil, India, Russia, and China are gradually adopting ablation technologies. It is anticipated that popularity of minimally invasive procedures and surging per capita expenditure on healthcare may propel the ablation technology market during the forecast period (2012 to 2020).. Browse ...
Radiofrequency ablation is today the most common invasive technique used to treat thyroid pancreas, bone, liver, kidneys, and lung cancer. It is an intricate procedure done by highly experienced Interventional Radiologists. In the US, for instance, the Austin radiofrequency ablation clinic in Texas has been attested. This is due to their high patient survival rates.. What is Radiofrequency Ablation?. If you or your loved one has cancer, then youve probably heard the doctor say that surgeries are, at times, not an option. This usually happens when the patients malignant tumor is at an early stage or is in locations that cant be surgically removable. Other times the patient is unable to afford the cost of surgical resection of the tumor.. Radiofrequency ablation involves the application of a high heat current through the tumor to kill the diseased cells.. How is it done?. Four key stages are followed to ensure a successful radiofrequency ablation.. Preoperative Evaluation. This is the first ...
Atrial fibrillation is the commonest cardiac arrhythmia. While a number of established drug therapies are often successful in achieving satisfactory control, more recently radiofrequency catheter ablation has emerged as an effective therapy for patients with paroxysmal AF. However, the place of catheter ablation remains unclear with limited data comparing ablation with antiarrhythmic drug therapy as first-line treatment in patients.. In the MANTRA-PAF trial 294 patients (mean age 55) with new onset paroxysmal atrial fibrillation and no history of antiarrhythmic drug use were randomly assigned to an initial strategy of either catheter ablation (146 patients) or therapy with class IC or class III antiarrhythmic agents (148 patients). Follow-up was by 7-day Holter-monitoring at 3, 6, 12, 18, and 24 months. The primary end points were the cumulative and per-visit burden of atrial fibrillation (i.e., percentage of time in atrial fibrillation). During follow-up there was no significant difference ...
TY - JOUR. T1 - Elimination of triggers without an additional substrate modification is not sufficient in patients with persistent atrial fibrillation. AU - Park, Junbeom. AU - Pak, Hui Nam. PY - 2015/2/1. Y1 - 2015/2/1. N2 - Atrial fibrillation (AF) is a multifactorial disease with complex pathophysiology. Although restoring sinus rhythm delays the progression of atrial remodeling, non-pharmacologic intervention, such as radiofrequency catheter ablation (RFCA), should be done based on the background pathophysiology of the disease. While circumferential pulmonary vein isolation (CPVI) has been known to be the cornerstone of AF catheter ablation, a clinical recurrence rate after CPVI is high in patients with persistent AF (PeAF). Step-wise linear ablation, complex fractionate atrial electrogram (CFAE)-guided ablation, rotor ablation, ganglionate plexus ablation, and left atrial appendage isolation may improve the ablation success rate after CPVI. But, there are still substantial AF recurrences ...
Objectives: To describe the initial results and early follow-up data after radiofrequency catheter ablation (RFA) of septal hypertrophy in children with hypertrophic obstructive cardiomyopathy (HOCM).. Methods: 11 children (5 female; age range 5-17 years; weight range 17-52 kg) with symptomatic HOCM underwent RFA for septal reduction. After initial left ventricular angiography to delineate the anatomic extent of the obstruction, sequential AV pacing at varying AV delays was performed to determine whether the LVOT gradient could be influenced by pacing techniques. If this was not the case, RFA was performed. The His bundle was plotted and marked using the LocaLisa navigation system (Medtronic, Minneapolis). Using an 8F cooled tip catheter (Sprinklr, Medtronic) with an infusion rate of 300 ml/hour during RFA, ablation was commenced at the most apical extent of the hypertrophied septum. Three lines of contiguous RF lesions were made, extending upto just under the aortic valve. Care was taken to ...
BACKGROUND Even with a low energy setting, radiofrequency energy applications on the left atrial (LA) posterior wall may cause excessive transmural injury (ETI) during catheter ablation of atrial fibrillation (AF). OBJECTIVE The purpose of this study was to clarify the prevalence and characteristics of ETI. METHODS This study included 104 patients with AF who underwent extensive encircling pulmonary vein isolation (EEPVI) followed by an endoscopic examination (≤48 hours after EEPVI). EEPVI was performed under conscious sedation, and the ablation settings at the LA posterior wall were a maximum energy of 20 to 25 W and duration of ≤30 seconds. The ETI was defined as any injury that resulted from EEPVI, including esophageal damage or periesophageal nerve injury. RESULTS ETIs were found in 10 (9.6%) patients and were all asymptomatic; esophageal damage in 4 patients and periesophageal nerve injury in the remaining 6. All patients with ETI were below normal weight (body mass index [BMI] | 24.9 kg
The need for this trial arises out of 1) the rapidly increasing number of pts , 60 years of age with AF accompanied by symptoms and morbidity, 2) the failure of anti-arrhythmic drug therapy to maintain sinus rhythm and reduce mortality, 3) the rapidly increasing application of radio-frequency catheter ablation without appropriate evidence-based validation, and 4) the expanding impact of AF on health care costs.. This study will randomize up to 2200 patients to a strategy of catheter ablation versus pharmacologic therapy with rate or rhythm control drugs. Each pt will have 1) characteristics similar to AFFIRM pts (≥65 yo or ,65 with ,1 risk factor for stroke, 2) Documented AF warranting treatment, and 3) Eligibility for both catheter ablation and ≥2 anti-arrhythmic or ≥2 rate control drugs. Pts will be followed every 6 months for an average of approximately 5 years and will undergo repeat trans-telephonic monitor, Holter monitor, and CT/MR studies to assess the impact of treatment.. The ...
To the Editor:. Catheter ablation is an important treatment for recurrent, symptomatic atrial fibrillation (AF). The original procedure targeted focal triggers of AF arising from within the pulmonary veins (PVs). This technique generated minimal left atrial (LA) scar but was complicated by the development of PV stenosis (1). Pulmonary vein antral isolation (PVAI) creates circular ablation lines within the left atrium, minimizing the risk for PV stenosis, and has become the preferred procedure for paroxysmal AF ablation. However, when PVAI is combined with adjunctive ablation, as much as 40% of the LA myocardium may be replaced by scar during a single catheter ablation (2), raising a concern that the procedure may adversely affect the ability of the left atrium to act as a contractile chamber (transport function) and/or compliance chamber (reservoir function). Although prior studies have examined the effect of AF ablation (3) and scar (4) on LA contractility, the effect on LA compliance has ...
RF has been successful in destroying tumors in patients with HCC. It has many advantages compared with other methods of thermal ablation. Rossi et al.8 reported that the maximum diameter of coagulation necrosis was 2.5 cm. This was achieved with a single electrode insertion using an RF generator with a frequency of 480 kHz, a maximum output power of 50 W (electrosurgical generator, RITA Medical System), and four expandable needle electrodes. In our study, the greatest long-axis dimension of standard RFA was 26.7 ± 6.4 mm. using an RITA 500PA with a frequency of 460 kHz, a maximum output power of 50 W, and four expandable needle electrodes. A necrotic area of up to 3 cm in dimension produced with a cooled RF single electrode was observed in tumors10 and cluster electrodes achieved a much larger necrotic area.9, 12, 29 However, the limited volume of coagulation necrosis obtained at each activation of the RF system and the sometimes irregular burn shape due to the proximity of large vessels that ...
Between February 1995 to May 2000, 626 consecutive patients underwent radiofrequency catheter ablation for various types of cardiac arrhythmia. The mean age was 41 years, range 1-85 years. Mapping and ablation were guided by intracardiac electrogram and anatomical approaches. The initial success, compliction, recurrent and final success rates are shown below :-WPW AVRT AT AFI AVNRT PVC VT AF Initial success (%) 95 100 83 91 100 89 95 81 Complication (%) 2.1 4.6 7.1 8.8 6.0 7.7 1.4 25 Recurrence (%) 9 4 13 6 1 11 11 6 Final success (%) 93 99 77 88 100 89 91 75 Conclusion, RFCA is an effective treatment and should be considered as first line treatment for certain tachyarrhythmia ...
Ventricular arrhythmias (VAs) arising from the origin above pulmonary valve lack comprehensive investigation. This study aimed to disclose the characteristics and radiofrequency catheter ablation (RFCA) outcomes for those VAs. One hundred six VAs arising from the region above pulmonary valve treated with RFCA were included in this study. Seventy-five cases were identified in the pulmonary sinus cusps (PSCs, 32 in left sinus cusp (PLC), 15 in right (PRC), 28 in anterior (PAC)) and 31 cases were in the main stem of pulmonary artery (MSPA, 18 above PLC (LMSPA), 3 above PRC (RMSPA), 10 above PAC (AMSPA)). Compared with PSCs VAs, MSPA VAs exhibited a higher R wave amplitude in the inferior leads, a total inferior R amplitude | 5.1 mV predicting MSPA origins. LMSPA, RMSPA and AMSPA VAs resembled PLC, PRC and PAC VAs in electrocardiographic characteristics respectively. No electrophysiological differences were found between PSCs and MSPA VAs. The irrigated-up catheter and R0 Swartz long sheath were more
TY - JOUR. T1 - RFA Guardian. T2 - Comprehensive Simulation of Radiofrequency Ablation Treatment of Liver Tumors. AU - Voglreiter, Philip. AU - Mariappan, Panchatcharam. AU - Pollari, Mika. AU - Flanagan, Ronan. AU - Blanco Sequeiros, Roberto. AU - Portugaller, Rupert Horst. AU - Fütterer, Jurgen. AU - Schmalstieg, Dieter. AU - Kolesnik, Marina. AU - Moche, Michael. PY - 2018/12/1. Y1 - 2018/12/1. N2 - The RFA Guardian is a comprehensive application for high-performance patient-specific simulation of radiofrequency ablation of liver tumors. We address a wide range of usage scenarios. These include pre-interventional planning, sampling of the parameter space for uncertainty estimation, treatment evaluation and, in the worst case, failure analysis. The RFA Guardian is the first of its kind that exhibits sufficient performance for simulating treatment outcomes during the intervention. We achieve this by combining a large number of high-performance image processing, biomechanical simulation and ...
Iatrogenic ATs have been reported after either surgical or catheter ablation of AF.7-14 After ablation of paroxysmal AF (wherein the initial ablation procedure is predominantly directed to PV isolation), the mechanism of AT is virtually always focal, originating from reconnected PVs.10 However, ablation of persistent AF typically involves LA, and sometimes RA, "substrate" ablation (linear lesions and ablation of sites of complex fractionated electrograms) beyond simple PV isolation. Here, we report a novel approach to mapping these postablation scar-related ATs by using a combination of activation mapping with a multielectrode array mapping catheter and targeted entrainment mapping.. The mechanisms of postablation ATs depend to a large extent on the ablation performed in the index procedure. A segmental approach to PV isolation, confirmed with a circular mapping catheter, resulted in most postablation ATs being of a focal mechanism from reconnected PV ostia.10,12 Anatomic approaches have been ...
This analysis confirms that noninducibility of any VT after catheter ablation for patients with prior MI is significantly associated with a decreased risk of the primary outcome of a composite endpoint of death, appropriate shock, or VT storm after 30 days in addition to the secondary outcome of a composite of appropriate ICD shock at any time, VT storm at any time, and sustained VT below the ICD detection limit. Although the VANISH design allowed a procedural endpoint if only VT ,300 ms was inducible, our analysis suggests that even these faster VTs may predict worse outcomes. These results are particularly important given that the VANISH trial was a randomized controlled trial with standardized ICD programming and AAD use.. Although we clearly found that patients rendered noninducible with VT ablation had a better prognosis, we were unable to identify any baseline clinical characteristics that were predictive of noninducibility in this patient population. Other studies have demonstrated the ...
Pulmonary thromboembolism (PTE) is a fatal condition that may rarely occur due to complications of coronary catheter insertion. In this case report, a 41-year-old male was presented 48 hours after radiofrequency catheter ablation(RFCA) for the management of Wolf-Parkinson-White syndromewith acute onset of dyspnea, hemoptysis, and chest pain. The physical examination revealed coarse crackles in the base of left hemithorax and laboratory tests were normal. The patient was suspicious for PTE based on clinical symptoms and the history ofRFCA. Diagnosis was confirmed by computed tomography angiography of lungs. Patient symptoms improved after 3 months of treatment with warfarin
Ablation refers to minimally invasive procedures which entail the surgical excision of body tissues. Ablation procedures are gaining rapid popularity across the globe on account of the fact that they are used in minimally invasive ablation procedures. Lower risk of damage to tissues, lower risk of infection, quick recovery and cost effectiveness of ablation are some of the major drivers of this market.. Full research report on Ablation Technology Market Analysis: http://www.grandviewresearch.com/industry-analysis/ablation-devices-industry. Growing base of geriatric population across the world clubbed with rising incidence rates of target conditions such as cancer and urological diseases will serve the global Ablation Technology market as high impact rendering drivers. Growing adoption of ablation procedures in emerging economies such as India, China, Russia and Brazil owing to the presence of high unmet medical needs and rising per capita healthcare expenditure in these countries, will fuel the ...
PurposeThe purpose of this study was to evaluate need for antibiotic prophylaxis for radiofrequency ablation (RFA) of liver tumors in patients with no significant co-existing risk factors for infection.Materials and MethodsFrom January 2004 to September 2013, 83 patients underwent 123 percutaneous RFA procedures for total of 152 hepatocellular carcinoma (HCC) lesions. None of the patients had pre-existing biliary enteric anastomosis (BEA) or any biliary tract abnormality predisposing to ascending biliary infection or uncontrolled diabetes mellitus. No pre- or post-procedure antibiotic prophylaxis was provided for 121 procedures. Data for potential risk factors were reviewed retrospectively and analyzed for the frequency of infectious complications, including abscess formation.ResultsOne patient (1/121 (0.8 %) RFA sessions) developed a large segment 5 liver abscess/infected biloma communicating with the gallbladder 7 weeks after the procedure, successfully treated over 10 weeks with IV and PO ...
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Radio-frequency ablation (RFA) is used to locally disrupt electrical propagation in myocardium and treat arrhythmias, and direct visualization of ablation
Kumar N, Gaba RC, Knuttinen MG, Omene BO, Martinez BK, Owens CA, et al. Tract seeding following radiofrequency ablation for hepatocellular carcinoma: prevention, detection, and management. Semin Interv Radiol. 2011;28(2):187-92.CrossRefGoogle Scholar ...
During radiofrequency ablation, Dr. Lee will first make a very small incision to create room for a slender catheter. The catheter serves as a delivery tool for concentrated heat (the radiofrequency energy,) which is sent directly into the vein walls. This heat forces the vein to compress. The blood inside the vein will then gradually be redirected into healthy veins below. The vein, which will then be just a shell, will gradually be absorbed by the body and replaced with scar tissue. This leaves the surface of the skin smooth and clear. The radiofrequency ablation treatment process usually takes less than an hour, but it depends on how many veins are being treated during the session. Radiofrequency ablation is quite well tolerated and most patients need only local anesthesia or mild sedation for the procedure.. ...
Aims Early identification of patients who could benefit from early re-intervention after catheter ablation is highly warranted. Our aim was to investigate the association between post-procedural burden of supraventricular ectopic complexes (SVEC) and the risk of long-term atrial fibrillation (AF) recurrence. Methods and results A total of 125 patients undergoing catheter ablation for AF were included. Patients underwent 7-day Holter recordings immediately post-procedural. The number of SVEC in post-procedural Holter recordings was categorized into quartiles: 0-72, 73-212, 213-782 and amp;gt;= 783 SVEC/day. Long-term AF recurrence was defined as a combined endpoint of AF amp;gt;= 1 min during follow-up Holter recordings, cardioversion or hospitalization for AF after a 3-month blanking period and within 24 months of follow-up. High post-procedural supraventricular ectopy burden was associated with an increased risk of long-term AF recurrence in a dose-dependent manner (amp;gt;= 783 SVEC: HR 4.6 ...
Sonacare Medical. The report studies the industry for Tumor Ablation across the globe taking the existing industry chain, the import and export statistics in Tumor Ablation market & dynamics of demand and supply of Tumor Ablation into consideration. The Tumor Ablation research study covers each and every aspect of the Tumor Ablation market globally, which starts from the definition of the Tumor Ablation industry and develops towards Tumor Ablation market segmentations. Further, every segment of the Tumor Ablation market is classified and analyzed on the basis of product types, application, and the end-use industries of the Tumor Ablation market. The geographical segmentation of the Tumor Ablation industry has also been covered at length in this report.. The competitive landscape of the worldwide market for Tumor Ablation is determined by evaluating the various industry participants, production capacity, Tumor Ablation markets production chain, and the revenue generated by each manufacturer in ...
Biosense Webster, a subsidiary of Johnson & Johnson, accounted for the majority of the cardiac ablation market with its line of irrigated RF ablation catheters. Biosense offers the CELSIUS, EZ Steer®, Navistar® and ThermoCool® ablation catheter product lines. Biosense Webster is also a major supplier of diagnostic electrophysiology catheters that are often used in conjunction with ablation catheters. The company is expected to increase their market share as these devices gain popularity.. Medtronic competes in the cardiac ablation market primarily with its ENHANCR® II and RF Conductr® ablation catheter product lines. Medtronic also acquired CryoCath Technologies Inc. in 2008 for $380 million and Ablation Frontiers LLC for $225 million in 2009 to gain market share advantage in the potentially lucrative cryoablation market. Cryoablation catheters have a significantly higher ASP than RF catheters. Medtronic also acquired ATS Medical for $350 million in 2010, further strengthening Medtronics ...
A study published in February reported that patients who took Pradaxa (dabigatran) following radiofrequency ablation to treat atrial fibrillation experienced more bleeding and blood clots compared to people who were treated with warfarin post-procedure. The authors of the study, published in the Journal of the American College of Cardiology, noted that the lack of antidote to reverse life-threatening Pradaxa bleeding side effects "makes the risk of excessive bleeding complications all the more important.". The study looked at 290 patients who had undergone atrial fibrillation ablation procedures performed at eight high-volume hospitals from January 2010 to July 2011. Roughly half were treated with 150 mg of Pradaxa twice daily for at least 30 days before AF ablation. Pradaxa was withheld on the day of surgery and restarted 3 hours after ablation. The remaining patients were assigned uninterrupted periprocedural warfarin.. Overall, 2.1% of patients assigned Pradaxa experienced thromboembolic ...
Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia encountered in clinical practice. Radiofrequency catheter ablation (CA) is increasingly employed to treat this disease, yet the selection of persistent AF patients who will benefit from this treatment remains a challenging task. Several parameters of the surface electrocardiogram (ECG) have been analyzed in previous works to predict AF termination by CA, such as fibrillatory wave (f-wave) amplitude. However, they are usually manually computed and only a subset of electrodes is inspected. In this study, a novel perspective of the role of f-wave amplitude as a potential noninvasive predictor of CA outcome is adopted by exploring ECG interlead spatial variability. An automatic procedure for atrial amplitude computation based on cubic Hermite interpolation is first proposed. To describe the global f-wave peakto-peak amplitude distribution, signal contributions from multiple leads are then combined by condensing the most
The purpose of this EP Wire is to survey clinical practice in this rapidly evolving field as the variety of surgical techniques and the heterogeneity of treated patients make the comparison of results and outcomes challenging. Twenty-four European centres, all members of the EHRA EP research network, responded to this survey and completed the questions. Of the participating centres, 11 (46) performed (irrespective of the technique) stand-alone surgical atrial fibrillation (AF) ablation in 2011. Seven hospitals (64) performed totally thoracoscopic AF ablation procedures off-pump (in 20100 of their cases). The most commonly used lesion set was only pulmonary vein isolation in five hospitals (46). Eight centres (73) performed validation of the surgical lesion set at the time of intervention. The most important indication for performing stand-alone, totally thoracoscopic surgical AF ablation in seven participating hospitals was failed catheter ablation. According to their definition of success, ...
Percutaneous catheter ablation is a key treatment modality in the contemporary management of ventricular arrhythmias (VA). Ablation reduces the burden of implanted cardioverter-defibrillator shocks,1 which are otherwise associated with poor quality of life and increased mortality.2 Ablation can be life saving for incessant or repeated VA electrical storm (ES).3 However, acute and long-term efficacy remain suboptimal. Acute procedural success is achievable in 56% to 77% of patients with ventricular tachycardia (VT) related to ischemic cardiomyopathy and 38% to 67% of patients with nonischemic cardiomyopathy (NICM), whereas 30% to 50% of patients recur during long-term follow-up.4-6 Exhaustive efforts using endocardial and epicardial ablation at times fail to abolish VA. Such patients suffer a poor prognosis from uncontrollable arrhythmia, progressive heart failure, and high mortality.1 As the utilization of VT ablation continues to increase over time, the complexity of patients being referred for ...
In clinical radiology, there are numerous examples of new techniques that were initially enthusiastically promoted and then subsequently abandoned when early promise was not realized in routine patient care. Appropriateness of new or established interventional radiology techniques to specific clinical conditions must be determined from clinical experience, from communication with experts in the field and/or careful review of available medical literature, and on an individual patient basis by means of review of clinical notes and diagnostic imaging studies. For patients with liver neoplasms, regional techniques such as radiofrequency ablation (RFA) have been developed and are now the subject of ongoing research. This article describes the utilization of Evidence-Based Practice (EBP) techniques as a means of deciding the appropriateness of percutaneous RFA in treating colorectal liver metastases (CLM ...
Figure 9. Activation maps for 1 of the capture episodes obtained after lesion induction. The recording obtained with 1 of the electrodes indicates the time corresponding to each of the maps. The color coding indicates local activation times and isochrones. The stimulating electrode is positioned in the central area of the multiple electrode, located on the left ventricular anterior wall.. Discussion The main results of this study are as follows: a) the induction of a lesion in the LV free wall increases the heterogeneity of myocardial activation during VF and modifies the arrival of fronts in adjacent regions; b) stimulation during VF using trains of high-frequency stimuli causes occasional captures during at least 3 consecutive stimuli, and c) lesion elongation slightly increases consecutive captures when using cycles slightly longer than those of the arrhythmia.. Modification of Myocardial Activation During Ventricular Fibrillation Caused by the Lesion Radiofrequency catheter ablation is a ...
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Radiofrequency ablation (RFA) is a procedure that destroys tumor cells by heating them using a needle electrode and high-frequency electrical currents. Ultrasound or CT imaging may be used to help the radiologist guide the needle into the tumor.. Over the last few years, developments in tumor ablation have allowed large volume tissue ablation to be performed safely on selected patients. While other minimally invasive methods of tumor ablation have been used, at this point in time, RFA has been the most commonly used method.. When should I consider RFA?. Radiofrequency ablation can be a viable and effective treatment option for patients who wish to avoid conventional surgery or are too ill to undergo surgery. RFA can be an appropriate treatment for cancer of the liver, kidney, lung, and bones, depending on the specifics of each case. RFA may also be used to reduce the size of a tumor so that it can be more easily eliminated by conventional treatment (chemotherapy or radiation) or to provide ...
Introduction. Multiple important advances in ablation have taken place over the past year. Seminal articles in the ablation of atrial fibrillation (AF) and ventricular tachycardia (VT) were published.. Atrial Fibrillation. The multicenter FIRE AND ICE (Comparative Study of Two Ablation Procedures in Patients With Atrial Fibrillation) trial randomized 769 patients with paroxysmal AF to cryoballoon or radiofrequency ablation. This landmark trial showed that cryoballoon ablation was non-inferior to radiofrequency ablation in terms of the primary efficacy endpoint. In addition, safety analysis showed that both procedures have similar safety profiles.1 The randomized AATAC (Ablation vs Amiodarone for Treatment of AFib in Patients With CHF and an ICD) trial, which included 203 patients with persistent AF, NYHA class II to III heart failure with reduced ejection fraction and an implantable cardioverter defibrillator, showed that catheter ablation is superior to amiodarone in preventing AF recurrence.2 ...
Guides you through the decision to have catheter ablation for the heart rhythm problem atrial fibrillation. Lists benefits and risks of catheter ablation and medical therapy. Includes interactive tool to help you make your decision.
PurposeThe aim of the present study was to investigate the technical feasibility of flat-panel cone-beam CT (CBCT)-guided radiofrequency ablation (RFA) of very small (,1.5 cm) liver tumors.Materials and MethodsPatients included were candidates for hepatic percutaneous RFA as they had single biopsy-proven hepatic tumors sized ≤1.5 cm and poorly defined on ultrasonography. Following apnea induction, unenhanced CBCT scans were acquired and used to deploy the RF electrode with the aid of a virtual navigation system. If the tumor was not clearly identified on the unenhanced CBCT scan, a right retrograde arterial femoral access was established to carry out hepatic angiography and localize the tumor. Patients lesions and procedural variables were recorded and analyzed.ResultsThree patients (2 male and 1 female), aged 68, 76, and 87 years were included; 3 lesions (2 hepato-cellular carcinoma and 1 metastasis from colorectal cancer) were treated. One patient required hepatic angiography. Cycles of ...
PURPOSE: The aim of this study was to evaluate the literature for articles assessing radiofrequency ablation (RFA) for pulmonary malignancy. MATERIALS AND METHODS: The bottom-up approach to evidence-based practice was applied by 2 reviewers to the retrieval and appraisal of original research articles published on pulmonary RFA between 2002 and 2009. Primary lung cancer and pulmonary metastases data were analyzed separately. The relationship between the percentage of local recurrence rate and lesion size, patient age, follow-up duration, and time to local recurrence was assessed using Spearmans rank correlation. Discrete time series were used to evaluate time trends. RESULTS: Secondary evidence yielded 1 review of 26 observational studies. Primary evidence yielded 46 studies that seemed suitable for detailed appraisal. A total of 2905 ablations were performed in 1584 patients. Eight studies evaluated primary lung cancers alone, 11 evaluated pulmonary metastases alone, 25 evaluated both, and 2 ...
The endovenous radio frequency ablation (or VNUS Closure) procedure is a minimally-invasive vein treatment. It uses a patented radiofrequency catheter inserted into the vein, which applies RF energy to heat the vein. This causes the vein to collapse and seal shut. The VNUS Closure procedure has been FDA-approved since 1999 and over 250,000 procedures have been performed worldwide.
The endovenous radio frequency ablation (or VNUS Closure) procedure is a minimally-invasive vein treatment. It uses a patented radiofrequency catheter inserted into the vein, which applies RF energy to heat the vein. This causes the vein to collapse and seal shut. The VNUS Closure procedure has been FDA-approved since 1999 and over 250,000 procedures have been performed worldwide.
Baseline characteristics of the patients in this study were generally comparable to those in the pre-approval THERMOCOOL VT ablation trial, including use of amiodarone (68.3% vs. 70%, respectively) (9); however, some differences are notable. Whereas a majority of the patients in the present study had coronary artery disease (95.4%) and MI (85.4%), only patients with previous MI (100%) were enrolled in the previous study. Also, more patients in the current study had hypertension, coronary angioplasty, and history of atrial fibrillation, as well as slightly higher mean LVEF (30% vs. 25%). Whereas baseline patient characteristics differed somewhat, both studies had almost identical study designs and ablation strategies. Of note, the all-cause mortality rate of 13.4% at 12 months post-ablation in the present study was better than in the previous study, where 1-year mortality was 18%. The improved mortality may be linked to patient selection with a better EF and lower prior MI rate in the current ...
Background A remote magnetic navigation (MN) system is available for radiofrequency ablation of atrial fibrillation (AF), challenging the conventional manual ablation technique. The myocardial markers were measured to compare the effects of the two types of MN catheters with those of a manual-irrigated catheter in AF ablation. Methods AF patients underwent an ablation procedure using either a conventional manual-irrigated catheter (CIR, n=65) or an MN system utilizing either an irrigated (RMI, n=23) or non-irrigated catheter (RMN, n=26). Levels of troponin T (TnT) and the cardiac isoform of creatin kinase (CKMB) were measured before and after ablation. Results Mean procedure times and total ablation times were longer employing the remote magnetic system. In all groups, there were pronounced increases in markers of myocardial injury after ablation, demonstrating a significant correlation between total ablation time and post-ablation levels of TnT and CKMB (CIR r=0.61 and 0.53, p,0.001; RMI r=0.74 ...
Atrial fibrillation catheter ablation energy sources radiofrequency, cryothermy, and laser energy and catheter types, including balloon catheters.
Radiofrequency ablation (RFA) is a medical procedure in which part of the electrical conduction system of the heart, tumor or other dysfunctional tissue is ablated using the heat generated from medium frequency alternating current (in the range of 350-500 kHz). RFA is generally conducted in the outpatient setting, using either local anesthetics or conscious sedation anesthesia. When it is delivered via catheter, it is called radiofrequency catheter ablation. Two important advantages of radio frequency current (over previously used low frequency AC or pulses of DC) are that it does not directly stimulate nerves or heart muscle and therefore can often be used without the need for general anesthetic, and that it is very specific for treating the desired tissue without significant collateral damage.[citation needed] Documented benefits have led to RFA becoming widely used during the 21st century. RFA procedures are performed under image guidance (such as X-ray screening, CT scan or ultrasound) by an ...
SEE PAGE 14 D urable isolation following pulmonary vein (PV) ablation may not be necessary for effective suppression of atrial fibrillation (AF) in certain patients with AF. However, most patients are thought to benefit from durable PV isolation, because PV reconnection seems to by and large underlie the mechanism of AF following catheter ablation (1). A recent study found that among patients undergoing $3 radiofrequency (RF) catheter ablations for AF, presence of durable isolation in all PVs was only noted in w8% (2). It has been shown that in most cases, PV conduction recovery occurs rapidly, with as many as one-third of targeted PVs and four-fifths of those that recover electrical conduction reconnecting in as little as 30 min (3). Moreover, there still remains the possibility that conduction block may be observed despite presence of a conduction gap. Ranjan et al. (4) created a 2-dimensional model of the cardiac syncytium simulating RF ablation lines with gaps of varying lengths, conductivity, and
A catheter ablation procedure, with ablation catheters from Medtronic, is a minimally invasive procedure to treat atrial fibrillation.
New life-saving treatments for Arrythmia in clinical trial on The Use of Remote Magnetic Navigation in Catheter Ablation of Heart Arrythmia
In the in vitro study, the mean temperature at the front and ventral wall of the spinal canal was 50.8 °C and 43.6°C, respectively at 20 mm significantly greater than 37.7 °C and 33.7±1.7 °C, respectively, at 10 mm ablation depth. The coagulative necrosis area was significantly (P,0.0001) greater at 20 mm depth than at 10 mm depth (mean 17.0×20.7 mm2 vs. 14.2×16.6mm2). In the in vivo experiment, the local temperature increased significantly (P,0.05) from around 36 °C before ablation to over 41 °C at 20 minutes after ablation, with the temperature at the electrode tip (90.4°C) and withint the vertebral body (67.0°C) significantly (P,0.05) greater than at the posterior (41.9°C) and lateral wall (41.8°C). Immediately and one week after RFA, coagulative necrosis was present in the ablation site. From 2 to 5 weeks, bone remodeling began with proliferatin of granulation, fibrous tissues, callus, and normal bone trabecula. Clinically, all four patients had successful RFA and ...
Learn about radiofrequency ablation therapy for kidney tumor. Radiofrequency ablation, sometimes referred to as RFA, is a minimally invasive treatment for cancer.
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The purpose of the study is to evaluate the effectiveness of radiofrequency ablation by pathological correlation and to characterize the tissue response
CHICAGO - The largest-ever randomized trial of catheter ablation for atrial fibrillation ended in a draw, but there may be a clear winner for some patients.
Clinical assessment of computed tomography guided radiofrequency ablation in the treatment of inoperable patients with pulmonary tumors
Hoyt et al identified risk factors for complications following atrial fibrillation. These can help to identify a patient who may benefit from alternative therapy or referral to an expert. The authors are from the Johns Hopkins University.
Targeted radiofrequency ablation (also written t-RFA) is a minimally invasive procedure to treat severe pain and discomfort caused from metastatic tumors in the vertebral body of the spine. This procedure uses radiofrequency energy to target and ablate a specific spinal tumor, causing it shrink and reduce the pressure on the surrounding nerves and tissues. The procedure minimizes damage to the vertebrae and surrounding tissues. It is used as a palliative therapy rather with the intention of treating the cancer itself. Targeted radiofrequency ablation was first developed by DFINE, Inc., a medical device company based in San Jose, California.[citation needed] Its product, the STAR Tumor Ablation System received 510(k) clearance from the United States Food and Drug Administration in August 2010.[citation needed] It is cleared for sale in the US and CE marked in Europe. The procedure was first performed at the James Graham Brown Cancer Center located at the University of Louisville Hospital in March ...
OBJECTIVES: The HISTORIC-AF trial is a prospective, multicentre, single-arm study designed to evaluate the outcomes of a staged endoscopic and transcatheter ablation in patients with stand-alone, persistent or long-standing persistent atrial fibrillation (AF). METHODS: From 2012 to 2015, 100 consecutive patients were enrolled and underwent thoracoscopic left atrial epicardial isolation (box lesion) followed by transcatheter ablation in case of AF recurrency. The safety end point was the composite outcome of freedom from major adverse events at 30-days, while efficacy end points were: (i) primary: freedom from AF and stable sinus rhythm following isolated thoracospic ablation ,60% and (ii) secondary: freedom from AF and stable sinus rhythm ,80% following hybrid ablation (as per HRS criteria ...
Ventricular radio-frequency ablation (RFA) can have a critical impact on preventing sudden cardiac arrest but is challenging due to a highly complex arrhythmogenic substrate. This work aims to identify local image characteristics capable of predicting the presence of local abnormal ventricular activities (LAVA). This can allow, pre-operatively and non-invasively, to improve and accelerate the procedure. To achieve this, intensity and texture-based local image features are computed and random forests are used for classification. However using machine-learning approaches on such complex multimodal data can prove difficult due to the inherent errors in the training set. In this manuscript we present a detailed analysis of these error sources due in particular to catheter motion and the data fusion process. We derived a principled analysis of confidence impact on classification. Moreover, we demonstrate how formal integration of these uncertainties in the training process improves the algorithms
Catheter ablation complex or fractionated atrial electrograms (CFAE) may improve outcomes for persistent AF. However, it is unclear whether CFAE are important in maintaining AF or whether targeting of CFAE can be refined based on electrogram morphology or knowledge of the remodelling process. A detailed classification of CFAE was described. Assessment of 100 CFAE by visual inspection in real time correlated well with detailed offline measurement. Targeting of different CFAE morphologies in 20 patients with persistent AF caused cycle length prolongation only with ablation of certain CFAE morphologies. Therefore, targeting CFAE is not simply atrial de-bulking, certain CFAE morphologies are more important for maintaining AF. A computer model was established to simulate LA wall stress using a 3D reconstruction of the chamber from CT imaging. Electrophysiologic data was acquired in 19 patients in persistent AF and compared to simulated wall stress data. Peaks in wall stress were associated with areas ...
TY - JOUR. T1 - Novel methods for renal tissue ablation. AU - Olweny, Ephrem O.. AU - Cadeddu, Jeffrey A. PY - 2012/9/1. Y1 - 2012/9/1. N2 - PURPOSE OF REVIEW: To provide an overview of the current research on renal tissue ablation, highlighting novel ablation techniques and technologies. RECENT FINDINGS: As long-term data on renal radio frequency ablation (RFA) and cryoablation confirming their oncologic efficacy emerge, ongoing research aims at improving the treatment profiles of these techniques as well as developing novel methods for renal tissue ablation. SUMMARY: Although nephron-sparing surgery is the gold standard treatment for small renal masses confirmed malignant, ablative therapies are an option in elderly patients, who may be poor surgical candidates. RFA and cryoablation have each been used for renal tissue ablation for over a decade but their efficacy in ablation of central lesions or lesions more than 3cm in size is limited. Increasing ablation size and improving efficiency of ...
A cell necrosis apparatus includes an introducer with a tissue piercing distal end. An RF electrode device includes a first RF electrode with a tissue piercing distal end, a second RF electrode with a tissue piercing distal end, and a third RF electrode with a tissue piercing distal end. The first and second electrodes each have an exterior non-insulated energy delivery surface and an exterior opposing insulated surface. The first, second and third RF electrodes are deployable from the introducer with the first and second RF electrodes exterior non-insulated energy delivery surfaces facing and surrounding the third RF electrode.
Regardless of the patients baseline thromboembolic risk, OAC therapy is indicated to prevent thromboembolism during, and shortly after, catheter ablation procedure for AF due to the increased periprocedural risk of stroke or TIA.1 The long-term continuation of OAC following the procedure is less evidence-based, and is currently tailored according to the patients thromboembolic and bleeding risks.1,4 Other factors might be weighed in this decision making: on the one hand, the long-term risk of stroke after AF ablation, as shown by this trial and others,5 is low; on the other hand, AF recurrence after ablation is more likely to be asymptomatic and can recur late after the procedure.6. The key finding of this study is that the continuation of OAC therapy beyond three months post-RFA did not significantly reduce thromboembolic risk, even in patients with higher CHA2DS2-VASc scores. However, OAC treatment was associated with an increased risk of serious bleeding, suggesting that in these patients, ...
The (Catheter Ablation Versus Anti-arrhythmic Drug Therapy for Atrial Fibrillation Trial) CABANA Trial has the overall goal of establishing the appropriate roles for medical and ablative intervention for atrial fibrillation (AF). The CABANA Trial is designed to test the hypothesis that the treatment strategy of left atrial catheter ablation for the purpose of eliminating atrial fibrillation (AF) will be superior to current state-of-the-art therapy with either rate control or rhythm control drugs for decreasing the incidence of the composite endpoint of total mortality, disabling stroke, serious bleeding, or cardiac arrest in patients with untreated or incompletely treated AF. ...
Task Force to Explore Thyroid Applications of Radiofrequency Ablation (RFA). 1. Assess all aspects of radiofrequency ablation (RFA) to include initial FDA approval of the device, CPT codes for payment related to thyroid disease, indications for treatment, anesthesia and safety issues.. 2. Establish a plan for clinical trials of thyroid applications of radio frequency ablation.. 3. Develop educational initiatives and opportunities for AACE members to become proficient in thyroid applications of radiofrequency ablation.. Training workshops in Thyroid RFA presently are located in three centers.. ...
...ROCKVILLE Md. July 6 -- A procedure that sen... ...The report examines the use of a procedure called radiofrequency cathe... ...,New,AHRQ,Study,Finds,Mixed,Evidence,on,Use,of,Radiofrequency,Catheter,Ablation,for,Treating,Atrial,Fibrillation,medicine,advanced medical technology,medical laboratory technology,medical device technology,latest medical technology,Health
Catheter ablation of most arrhythmias has a high success rate. Success rates for WPW syndrome have been as high as 95% [1] For SVT, single procedure success is 91% to 96% (95% CI) and multiple procedure success is 92% to 97% (95% CI).[2] For atrial flutter, single procedure success is 88% to 95% (95% CI) and multiple procedure success is 95% to 99% (95% CI).[2] For automatic atrial tachycardias, the success rates are 70-90%.[citation needed] The potential complications include bleeding, blood clots, pericardial tamponade, and heart block, but these risks are very low, ranging from 2.6-3.2%. For atrial fibrillation, several experienced teams of electrophysiologists in US heart centers claim they can achieve up to a 75% success rate. However one recent study claims that the success rates are in fact much lower - at 28% for single procedures. Often, several procedures are needed to raise the success rate to the 70-80% range.[3] One reason for this may be that once the heart has undergone atrial ...
The advent of catheter ablation has revolutionized the treatment of supraventricular cardiac arrhythmias, including in the last few years, atrial fibrillation. The discovery of electrically active sleeves of atrial myocardium extending into the pulmo
Japans largest platform for academic e-journals: J-STAGE is a full text database for reviewed academic papers published by Japanese societies
TY - JOUR. T1 - Radio-frequency thermal ablation of liver metastases with a cooled-tip electrode needle. T2 - Results of a pilot clinical trial. AU - Lencioni, R.. AU - Goletti, O.. AU - Armillotta, N.. AU - Paolicchi, A.. AU - Moretti, M.. AU - Cioni, D.. AU - Donati, F.. AU - Cicorelli, A.. AU - Ricci, S.. AU - Carrai, M.. AU - Conte, P. F.. AU - Cavina, E.. AU - Bartolozzi, C.. PY - 1998. Y1 - 1998. N2 - The aim of this study was to evaluate feasibility, safety, and effectiveness of radio-frequency (RF) thermal ablation, performed by using a cooled-tip electrode needle, in the treatment of liver metastases. Twenty-nine patients (20 males and 9 females; age range 43-77 years) with one to four hepatic metastases 1.1-4.8 cm in diameter (mean 2.9 ± 0.8 cm) from previously resected intra-abdominal primary malignancies were treated. All patients were excluded from surgery and had partial or no response to chemotherapy. Radio-frequency ablation was performed by using a 100-W generator and 17-gauge, ...
Our website is designed for anybody that is seeking information on heart rhythm problems and some of the treatments available. The heart rhythm problems we treat include: atrial fibrillation, ventricular tachycardia, supra-ventricular tachycardia, atrial fibrillation. Our procedures and diagnostic tests used to treat these heart rhythm problems include: radio-frequency ablation, cryo-ablation, atrial fibrillation ablation, atrial flutter ablation, cardiac catheterisation, heart rhythm monitoring, implantable cardiac defibrillators, pacemakers and superventricular tachycardia ablation. The website also introduces our team of consultants and details our full range of procedures.. For general queries about our services, please click here and we will respond within 72 hours. To arrange a consultation, you will need to be referred to us by your GP.. ...
Cardiac arrhythmias are a debilitating, potentially life threatening condition involving aberrant electrical activity in the heart which results in abnormal heart rhythm. Virtual cardioscopy can play an important role in minimally invasive treatment of cardiac arrhythmias. Second and third generation image-guidance systems are now available for the treatment of arrhythmias using RF ablation catheters. While these 3D tools provide useful information to the clinician, additional enhancements to the virtual cardioscopy display paradigm are critical for optimal therapy guidance. Based on input from clinical collaborators, several key visualization techniques have been developed to enhance the use of virtual cardioscopy during cardiac ablation procedures. We have identified, designed and incorporated several visual cues important to successful virtual cardioscopy. These features include the use of global reference maps, parametric mapping, and focused navigation and targeting using abnormal ...
The benefits of avoiding radiation are very clear. While a typical one-off x-ray such as those used to diagnose lung infections or bone fractures emit a single, very low dose of radiation, fluoroscopy involves a continuous stream of x-rays to guide the catheter and map the heart. X-rays are cumulative in ones lifetime. During a typical catheter ablation, patients are exposed to often unnecessary radiation. At teaching hospitals, where doctors are learning on patients, this can be exponentially increased. This cannot be fully mitigated by blocking x-rays with metal (lead), since we require unobstructed views and access to a large area of the torso. Avoidance of fluoroscopy is especially important for those who are more sensitive to radiation such as children, young adults and pregnant women. As with all procedures, the goal is to offer our patients the best outcomes with the fewest potential side effects.. The benefits of a no-radiation option also extend to Dr. Gidney and his staff, who do not ...
The electrical system of the heart controls each heartbeat. Electrical impulses generated by special tissue (nodes) travel set pathways through the heart causing the muscle to contract, or "beat". When abnormal electrical signals interfere with the normal flow of impulses, an irregular heartbeat occurs. Cardiac ablation is a procedure used to correct irregular heartbeats by destroying the tissue that creates the abnormal electrical signals. A catheter is threaded into the heart and the tip is guided to the area producing abnormal electrical signals. The catheter then emits a pulse of high-energy electricity that destroys the abnormal tissue and corrects the irregular heartbeat.. Request Stock Pricing. Parent Topic: Catheter Ablation ...
www.google.eshttp://www.google.es/patents/EP1059067B8?cl=en&utm_source=gb-gplus-sharePatente EP1059067B8 - Ablation treatment of bone metastases ...
Author Response.pdf. Reviewer 2 Report. This paper tests the hypothesis that the Kolmogorov complexity of a single atrial bipolar electrogram recorded during AF within the coronary sinus at the beginning of the catheter ablation may predict AF termination directly after pulmonary vein isolation (PVI). Results show significant differences in Kolmogorov complexity between patients with AF termination directly after PVI compared to patients undergoing additional ablation. Therefore, authors affirm that Kolmogorov complexity of electrograms measured at baseline before PVI can predict self-termination of AF directly after PVI. Overall, I believe that the goal of this study is very interesting and the tools used are appropriate. However, I have several major comments regarding the paper:. Authors talk about complexity measures, however they are different types of measurements and they do not measure complexity. Additional 30 second electrograms recorded 30 prior to AF termination were analyzed as the ...
The results of this meta-analysis indicate that RFA is superior to PEI in terms of overall survival and lower local recurrence rates for patients with Child-Pugh class A or B cirrhosis and an early nonsurgical HCC. However, the higher rate of adverse events displayed is something that will have to be tested with appropriate weighting of the possible benefits in each individual case.. While according to recent guidelines PEI should be considered the standard technique for percutaneous treatment of HCC in patients with cirrhosis [30], RFA has emerged as a real competitor to PEI in clinical grounds and is currently used as the primary ablative modality at most institutions [31, 32]. However, to date, the survival benefit of RFA versus that of PEI for HCC is controversial [1, 13, 14, 31].. In this study, a significant benefit in RFA vs. PEI in overall survival was observed. Interestingly enough, though individual studies provide data only in the first 4 years of treatment, the advantage in survival ...
You will be taken to the catheter lab where a nurse will stay with you and be there to reassure you throughout the procedure. There is a lot of equipment in the room, which is used to monitor your heart rhythm. You will be awake during the procedure, but to help you relax your doctor will give you a short acting sedative.. The doctor will inject a local anaesthetic into your groin to numb your leg. This may sting a little and you may feel some mild discomfort. When the local anaesthetic has taken effect, the doctor will insert a small tube (sheath) into your groin. You should not feel any pain, but let your doctor know if you do. Through the sheath the doctor will gently thread several flexible wires (catheter electrodes) into your heart. These special wires will record and ablate (destroy) the extra electrical signals from within your heart. The type of arrhythmia you have, will determine how many wires your doctor will use for your ablation. The catheters are about the size of a small drinking ...
Santa Rosa, CA (PRWEB) January 28, 2015 -- Atrial fibrillation (Afib) is a common, potentially life-threatening heart condition in which the upper heart
The RFA and/or vertebroplasty with cement injection were successful in all patients (100%). Except for one patient who had cement leakage, no intraprocedural complications occurred. After RFA, severe refractory pain was greatly relieved in all patients, with pretreatment VAS score of 8.1±1.4 significantly reduced to 5.5±1.1 at 24 h, 2.8±0.6 at one week and 1.4±0.8 at 6 months (P,0.01). The EORTC QLQ-C30 scale at one month demonstrated significant improvement (P,0.05) in the physical (P=0.03) and emotion function (P=0.003), global health status (P=0.002), pain (P=0.001) and insomnia (P=0.002). The analgesics were reduced after the procedure and stopped two months later in all patients, with greatly improved quality of life and no apparent pain. Followed up for 6-12 months, all patients remained alive with no recurrence of pain. ...
SUNNYVALE, Calif.--(BUSINESS WIRE)--Mar 6, 2012-- Covidien (NYSE: COV), a leading global provider of healthcare products, today announced the launch of the HALO60 Ablation Catheter, the latest addition to the HALO family of catheters for the endoscopic treatment of Barretts esophagus. The HALO product line joined the Covidien portfolio earlier when the Company acquired BARRX Medical, a leader in the development of minimally invasive medical devices to remove potentially precancerous tissue from the gastrointestinal tract.. Barretts esophagus is a precancerous condition of the lining of the esophagus caused by gastroesophageal reflux disease (GERD). Left untreated, backward flow of stomach contents such as acid and bile into the esophagus can lead to injury and chronic inflammation of the esophagus lining. A proportion of GERD patients are at risk of developing Barretts esophagus, which can lead to esophageal adenocarcinoma, a lethal cancer with a five-year survival rate of approximately ...
Treatment of atrial fibrillation by open cardiac ablation under 3-d mapping (costs for program #139941) ✔ University Hospital Münster ✔ Department of Congenital (CHD) and Acquired Heart Defects ✔ BookingHealth.com
TY - JOUR. T1 - Magnetic resonance imaging characteristics of renal tumors after radiofrequency ablation. AU - Svatek, Robert S.. AU - Sims, Robert. AU - Anderson, J. Kyle. AU - Abdel-Aziz, Khaled. AU - Cadeddu, Jeffrey A.. PY - 2006/3. Y1 - 2006/3. N2 - Objectives. The interpretation of radiographic findings in renal tumors treated with minimally invasive modalities, such as radiofrequency ablation (RFA), is critical for assessing treatment adequacy. Magnetic resonance imaging (MRI) is commonly used for patients with renal insufficiency or contrast allergy. Because the MRI experience with renal RFA is limited, we reviewed our experience and report the unique MRI characteristics of RFA-treated renal tumors. Methods. A single-institution database of renal RFA was reviewed to identify patients followed up with MRI. A radiologist and urologist retrospectively reviewed all MRI scans to identify the characteristic lesion findings after RFA. Results. Eleven patients (12 tumors) treated by RFA were ...
DM Zimmaro; Catheter ablation of ventricular tachycardia and related nursing interventions. Crit Care Nurse 1 July 1987; 7 (4): 20-28. doi: https://doi.org/10.4037/ccn1987.7.4.20. Download citation file:. ...
Background: Pancreatic cancer is the fourth leading cause of cancer related death in the Western world. At time of diagnosis, 20% of patients present with a resectable tumour, 40% with an irresectable locally advanced tumor (without metastases) and 40% with metastatic disease. The median survival of patients with irresectable locally advanced pancreatic cancer is only 6 months. Currently, there is no effective treatment for these patients Importance: There is an urgent need for new therapeutical options in pancreatic adenocarcinoma. Radiofrequency ablation (RFA) is a technique that has been demonstrated to be effective in the treatment of several irresectable tumours such as liver and lung neoplasms. RFA produces local tumour destruction from an electrode implanted directly into the tumour causing frictional heating. Objective: To evaluate whether endoscopic ultrasound-guided radiofrequency ablation (EUSRFA) plus conventional treatment (chemotherapy ± radiotherapy) improves overall survival in ...
This invention is related to a tissue ablation system and method that treats atrial arrhythmia by ablating a circumferential region of tissue at a location where a pulmonary vein extends from an atrium. The system includes a circumferential ablation member with an ablation element and also includes a delivery assembly for delivering the ablation member to the location. The circumferential ablation member is generally adjustable between different configurations to allow both the delivery through a delivery sheath into the atrium and the ablative coupling between the ablation element and the circumferential region of tissue.
DUGi: Viewing Item from repository Recercat: Background: Pancreatic cancer is the fourth leading cause of cancer related death in the Western world. At time of diagnosis, 20% of patients present with a resectable tumour, 40% with an irresectable locally advanced tumor (without metastases) and 40% with metastatic disease. The median survival of patients with irresectable locally advanced pancreatic cancer is only 6 months. Currently, there is no effective treatment for these patients Importance: There is an urgent need for new therapeutical options in pancreatic adenocarcinoma. Radiofrequency ablation (RFA) is a technique that has been demonstrated to be effective in the treatment of several irresectable tumours such as liver and lung neoplasms. RFA produces local tumour destruction from an electrode implanted directly into the tumour causing frictional heating. Objective: To evaluate whether endoscopic ultrasound-guided radiofrequency ablation (EUSRFA) plus conventional treatment (chemotherapy ±
WASHINGTON, DC - New multicenter research reveals that female patients fail ablation procedures more often than male patients, according to a study published in the February edition of the HeartRhythm Journal, the official journal of the Heat Rhythm Society. The study also shows that males undergo catheter ablation for the treatment of atrial fibrillation five times as often as females and typically with significantly fewer complications.
Catheter ablation[edit]. A further treatment option for people with Brugada syndrome is radiofrequency catheter ablation.[33] ... Kautzner J, Peichl P (June 2017). "Catheter ablation to prevent sudden cardiac death". International Journal of Cardiology. 237 ...
Definitive care may include catheter ablation. AV reentrant tachycardia (AVRT) requires an accessory pathway for its ...
Definitive care may include catheter ablation.[citation needed] AV reentrant tachycardia[edit]. AV reentrant tachycardia (AVRT ...
Catheter ablationEdit. *Ablation therapy - Catheter based ablation of lesions in the heart (with radiofrequency energy, ... "Non-complex" ablations include ablation for arrhythmias such as: AV nodal reentrant tachycardia, accessory pathway mediated ... "Complex" ablations include ablation for arrhythmias such as multifocal atrial tachycardia, atrial fibrillation, and ventricular ... In addition to the apparatus used for a "non-complex" ablation, these procedures often make use of sophisticated computer ...
Practical Guide to Catheter Ablation of Atrial Fibrillation (2nd ed.). Wiley-Blackwell. pp. 65-73. ISBN 9781118658505.. .mw- ... Radiofrequency ablation. References[edit]. *^ a b c Fauci, Anthony, et al. Harrison's Textbook of Medicine. New York: McGraw ... ablation.[5] Its navigation system calculates the position and orientation of the catheter tip, using three known magnetic ... The system is designed to visualise the real-time calculated position and orientation of a specialised RF ablation catheter ...
"The first Latin American Catheter Ablation Registry". Europace. 17: 794-800. doi:10.1093/europace/euu322. PMID 25616407. CS1 ...
Catheter ablation is a possible treatment for those with recurrent VT.[14] Remote magnetic navigation is one effective method ... There was consensus among the task force members that catheter ablation for VT should be considered early in the treatment of ... June 2009). "EHRA/HRS Expert Consensus on Catheter Ablation of Ventricular Arrhythmias: developed in a partnership with the ... Wissner E, Stevenson WG, Kuck KH (June 2012). "Catheter ablation of ventricular tachycardia in ischaemic and non-ischaemic ...
Future episodes can be prevented by catheter ablation. About 2.3 per 1000 people have paroxysmal supraventricular tachycardia. ...
Catheter ablation may be used to treat intractable ventricular tachycardia. It has a 60-90% success rate. Unfortunately, due to ... Indications for catheter ablation include drug-refractory VT and frequent recurrence of VT after ICD placement, causing ... catheter ablation, and placement of an implantable cardioverter-defibrillator. Prior to the decision of the treatment option, ... "Ventricular tachycardia catheter ablation in arrhythmogenic right ventricular dysplasia: a 16-year experience". DR HAKEEM ...
... in people treated with radiofrequency catheter ablation for WPW. If radiofrequency catheter ablation is successfully performed ... Radiofrequency catheter ablation is not performed in all individuals with WPW because inherent risks are involved in the ... WPW syndrome is treated with either medications or radiofrequency catheter ablation. It affects between 0.1 and 0.3% in the ... Thakur RK, Klein GJ, Yee R (September 1994). "Radiofrequency catheter ablation in patients with Wolff-Parkinson-White syndrome ...
If medications fail to control an arrhythmia, another treatment option may be catheter ablation. In these procedures, wires are ... Main articles: Heart arrhythmia, Radiofrequency ablation, and Artificial cardiac pacemaker. Abnormal heart rhythms (arrhythmias ... Whilst the majority of arrhythmias can be treated using minimally invasive catheter techniques, some arrhythmias (particularly ...
Efficacy and risks of catheter ablation of AF are areas of active debate. A worldwide survey of the outcomes of 8745 ablation ... A thorough discussion of results of catheter ablation was published in 2007; it notes that results are widely variable, due in ... A report of the Heart Rhythm Society (HRS) Task Force on catheter and surgical ablation of atrial fibrillation". Heart Rhythm. ... 2009). "Prevalence and causes of fatal outcome in catheter ablation of atrial fibrillation". J. Am. Coll. Cardiol. 53 (19): ...
Invasive treatments include forms of catheter ablation such as sinus node modification (selective ablation of the sinus node), ... Treatments in the form of pharmacological therapy or catheter ablation are available, although it is currently difficult to ... "Sinus node revisited in the era of electroanatomical mapping and catheter ablation". Heart. 91 (2): 189-94. doi:10.1136/hrt. ... complete sinus node ablation (with associated implantation of a permanent artificial pacemaker) and AV node ablation in very ...
Inoue, Shin; Becker, Anton E. (1998). "Koch's Triangle Sized Up: Anatomical Landmarks in Perspective of Catheter Ablation ... Implications for Catheter Ablation". Revista Española de Cardiología. 63 (6): 660-7. doi:10.1016/S1885-5857(10)70140-7. PMID ...
In August 2007, Phillips announced that he would undergo catheter ablation to address his heart problems.[14] Later that autumn ...
Reducing frequent PVC (>20%) by antiarrhythmic drugs or by catheter ablation significantly improves heart performance. Recent ... Radiofrequency catheter ablation treatment. It is advised for people with ventricular dysfunction and frequent arrhythmias or ... In these cases, if the PVCs are reduced or removed (for example, via ablation therapy) the cardiomyopathy usually regresses. ... Belhassen B (2005). "Radiofrequency ablation of "benign" right ventricular outflow tract extrasystoles: a therapy that has ...
It is performed without surgery, by using radiofrequency catheter ablation with one-day hospital. The results up to 100 months ... Catheter ablation of severe neurally meditated reflex (neurocardiogenic or vasovagal) syncope: cardioneuroablation long-term ... Syncopal high-degree AV block treated with catheter RF ablation without pacemaker implantation. Pacing Clin Electrophysiol. ... functional AV block and sinus dysfunction using catheter RF-ablation. Europace. 2005 Jan;7(1):1-13. PubMed PMID 15670960. ...
Cheema A; Vasamreddy CR; Dalal D. "Long-term single procedure efficacy of catheter ablation of atrial fibrillation". J Interv ... is a cardiac arrhythmia mapping company for targeting catheter ablation company launched in San Diego, California and ... "Topera receives FDA clearance for FIRMap Catheter". News Medical. Retrieved 15 April 2014. "Topera's FIRMap Catheter Receives ... "Catheter ablation for atrial fibrillation: are results maintained at 5 years of follow-up?". J Am Coll Cardiol. 57 (2): 160-6. ...
... it is often possible to ablate the circuit that causes atrial flutter with radiofrequency catheter ablation. Catheter ablation ... Atrial flutter can be treated more definitively with a technique known as catheter ablation. This involves the insertion of a ... Atypical atrial flutter rarely occurs in people who have not undergone previous heart surgery or previous catheter ablation ... Atrial fibrillation often occurs (30% within 5 years) after catheter ablation for atrial flutter. Although often regarded as a ...
Vagal maneuvers or a procedure known as catheter ablation may be effective in certain types. For atrial fibrillation calcium ... Ablation has been shown to be highly effective: around 90% in the case of AVNRT. Similar high rates of success are achieved ... Cryoablation uses a catheter supercooled by nitrous oxide gas freezing the tissue to −10 °C (+14.0ºF). This provides the same ... Radiofrequency ablation has revolutionized the treatment of tachycardia caused by a re-entrant pathway. This is a low-risk ...
Catheter ablation is a possible treatment for those with recurrent VT.[16] Remote magnetic navigation is one effective method ... There was consensus among the task force members that catheter ablation for VT should be considered early in the treatment of ... June 2009). "EHRA/HRS Expert Consensus on Catheter Ablation of Ventricular Arrhythmias: developed in a partnership with the ... "Catheter ablation of ventricular tachycardia in ischaemic and non-ischaemic cardiomyopathy: where are we today? A clinical ...
Imran invented a cooled RF ablation catheter for the treatment of ventricular arrhythmias. This invention became the initial ... In 1995, he developed a low-pressure balloon and aspirator system for use in catheter based interventions. Mr. Imran was the ...
Radiofrequency catheter ablation of atrial fibrillation guided by spectral mapping of atrial fibrillation nests in sinus rhythm ... A new treatment for atrial fibrillation based on spectral analysis to guide the catheter RF-ablation. Europace. 2004 Nov;6(6): ... Arruda M, Natale A. Ablation of permanent AF: adjunctive strategies to pulmonary veins isolation: targeting AF NEST in sinus ...
September 2007). "Cost Comparison of Catheter Ablation and Medical Therapy in Atrial Fibrillation". Journal of Cardiovascular ... He started a complex ablation program there, developing it into one of the most successful ablation programs in Canada, ... He has published research into complex ablation and pioneered cardiac ablation methods. Khaykin attended the University of ... "Prior Rhythm-Control Failure With Amiodarone Predicts Atrial Fibrillation Recurrence Following Catheter Ablation: Presented at ...
... its current usage is guiding magnetic catheters during electrophysiology studies and catheter ablation procedures to treat ... "Long-term outcomes of the current remote magnetic catheter navigation technique for ablation of atrial fibrillation". ... The rotation of the magnets within the Niobe pods influences the magnetic catheters in the heart to make micro movements of the ... This force is then transferred over the entire length until it reaches the tip of the catheter within the patient's heart. " ...
... catheter ablation) କାର୍ଯ୍ୟକ୍ଷମ ହୁଏ । ଆଟ୍ରିଆଲ ଫିବ୍ରିଲେସନ ନିମନ୍ତେ କ୍ୟାଲସିଅମ ଚାନେଲ ବ୍ଲକର (calcium channel blockers) ବା ବିଟା ବ୍ଲକର ...
Keywords: Follow-Up Studies, Pulmonary Veins, Electrophysiologic Techniques, Cardiac, Catheter Ablation, Diabetes Mellitus ... Comparison of radiofrequency catheter ablation of drivers and circumferential pulmonary vein isolation in atrial fibrillation: ... Radiofrequency Catheter Ablation of Drivers vs. Circumferential Pulmonary Vein Isolation in Patients With Atrial Fibrillation ... However, high-frequency source ablation was noninferior in regard to freedom from AF at 12 months, and was associated with a ...
Simplified catheter ablation could slash waiting lists for atrial fibrillation patients A day case catheter ablation procedure ... Loyola tests new catheter ablation system that can reach deeper into heart muscle Loyola Medicine is among two centers in the ... Catheter ablation better than drug therapy for reducing AFib episodes, but not for reducing death Atrial fibrillation is a ... Catheter ablation provides better outcomes for AF patients than conventional drug therapies Every year millions of people ...
Catheter ablation for cardiac arrhythmias. BMJ 2001; 322 doi: https://doi.org/10.1136/bmj.322.7286.613/a (Published 10 March ... Ablation should not be denied to elderly patients on basis of age. *David Bourne ([email protected]), specialist ...
I had my third ablation in February for recurring Atrial Fibrillation, since then my condition has worsen, to where I have had ... Catheter Ablation Leonard834 I had my third ablation in February for recurring Atrial Fibrillation, since then my condition has ... Catheter Ablation. I had my third ablation in February for recurring Atrial Fibrillation, since then my condition has worsen, ... My ablation was in January 08, however I was told in 2006 I needed an ablation because my a-fib was a very rapid a-fib and it ...
Catheter ablation is an important therapy for atrial and ventricular arrhythmias. Catheter ablation is now an established first ... Advanced Catheter Ablation. Start Date:. Saturday, 23 September, 2017. End Date:. Tuesday, 26 September, 2017 12:00pm. ... discussing detailed patient cases provide a step-by-step analysis and in-depth review of approaches to catheter ablation for ... the spectrum of cardiac arrhythmias including atrial fibrillation, complex atrial arrhythmias after AF ablation or in ...
4. Balloon-Based Ablation Catheter Point-to-point ablation using a focal catheter for PV isolation is associated with technical ... After ablation, AF burden was reduced from 26% to 9%. 5.3. Complications of Cryoballoon Catheter Ablation. Phrenic nerve ... Another study, the Freeze AF trial, is being planned to compare cryoballoon catheter ablation with open-irrigation RF ablation ... Comparison with Conventional Radiofrequency Catheter Ablation. Both conventional focal RF ablation and cryoablation are used ...
According to one aspect of the present invention, an ablation catheter includes an elongated flexible tubular member that is ... The catheter also includes a monopole antenna with tip section and a body section that includes a distal end and a proximal end ... antenna that is arranged to provide a relatively uniform electric field and a method for using such an ablation catheter ... produce a relatively uniform electric field around the monopole antenna which is sufficiently strong to cause tissue ablation. ...
A meta-analysis of randomized controlled trials found that catheter ablation was superior to conventional drug therapy alone ... Catheter ablation superior to standard drug. American College of Physicians. Journal. Annals of Internal Medicine. Keywords. * ... Catheter ablation is an established therapeutic strategy for atrial fibrillation, but guidelines recommend caution in certain ... The benefits and harms of catheter ablation versus drug therapy for patients with atrial fibrillation have not been firmly ...
Does anyone know how long is the typical recovery period from a catheter ablation for tachycardia? And how long it will take to ... Catheter Ablation Recovery Period vbluraschi Does anyone know how long is the typical recovery period from a catheter ablation ... Catheter Ablation Recovery Period. Does anyone know how long is the typical recovery period from a catheter ablation for ... I had a ablation just over a month ago now. I had to have 2 weeks off work as my groin area on my right leg was very painful ...
hi am just wondering if anyone can give me any advise i had my ablation in august 2009 and have been absolutely fine since then ... CATHETER ABLATION PROBLEMS RETURNED?. hi am just wondering if anyone can give me any advise i had my ablation in august 2009 ... I had an ablation back in Aug 09 also; my eps told me its possible for my heart to return to the rhythms it had previous or ... I had an ablation back in Aug 09 also; my eps told me its possible for my heart to return to the rhythms it had previous or ...
Catheter ablation is widely accepted as an effective and safe form of therapy for cardiac arrhythmia. In many instances this ... Progress in Catheter Ablation. Clinical Application of New Mapping and Ablation Technology. ... Catheter ablation is widely accepted as an effective and safe form of therapy for cardiac arrhythmia. In many instances this ... Radiofrequency Linear Ablation Using Looped Multipolar Catheters Boaz Avitall, Arvydas Urbonas, Dalia Urboniene, Scott C. ...
The location of this ablation target is determined by a process called mapping, in which the ablation catheter is moved from ... A catheter with a large electrode at its tip is in contact with the focus; after ablation (right), the area of the focus has ... Figure 2. Ablation of an SVT. Two electrocardiographic recordings (ECG) and a recording from a catheter in the atrium are shown ... What Types of Problems Are Treated by Catheter Ablation?. CA can be used to treat a wide variety of tachycardias, which can ...
AVNRT Ablation, Atrial Flutter Ablation, Atrioventricular Reciprocating Tachycardia Ablation, AVRT Ablation, Atrial Catheter ... Cardiac Catheter Ablation, Cardiac Ablation, Atrial Fibrillation Ablation, Supraventricular Tachycardia Ablation, Atrial ... Ablation, Catheter, Catheter Ablation, ABLATION CATH, CATH ABLATION, catheter ablation, catheter ablation (treatment), ablation ... ablation catheter, ablations catheter, ablations cardiac, cardiac ablation, Cardiac Ablation, Catheter ablation, Cardiac ...
Catheter ablation is usually performed by an electrophysiologist (a specially trained cardiologist) in a cath lab or a ... Catheter ablation involves advancing several flexible catheters into the patients blood vessels, usually either in the femoral ... Catheter ablation of most arrhythmias has a high success rate. Success rates for WPW syndrome have been as high as 95% [1] For ... Catheter ablation is a procedure used to remove or terminate a faulty electrical pathway from sections of the hearts of those ...
Catheter-ablation treatment is related to, but distinct from, surgical ablation, which was the subject of a Page One article in ... Catheter ablation can help, he said. Douglas L. Packer, a Mayo Clinic cardiologist, also presented early results of a planned ... Ablation redirects electricity onto its proper path.. *The catheter typically is inserted into the femoral vein in the groin ... Catheter ablation may treat some patients who have atrial fibrillation.. *In atrial fibrillation, the hearts electrical ...
The catheter is characterized in having a tip member which during the initial placement of the catheter within the vascular ... A RF ablation catheter for removing athero-stenotic lesions or modifying the tissue characteristics of the interior walls of ... the ablation catheter with means for deploying electrodes following the positioning of the distal end of the ablation catheter ... an important aspect of the ablation catheter of the present invention is that as the catheter is being routed through the ...
... and ablation, wherein a flexible electrode catheter, having a tip electrode with suspension structure, is pre-shaped to snugly ... A catheter-based method for coronary sinus mapping, pacing, ... Ablation Frontiers, Inc.. Atrial ablation catheter and method ... Curved ablation catheter. US20050267460 *. May 27, 2004. Dec 1, 2005. Roop John A. Ablation catheter with suspension system ... Medtronic Ablation Frontiers Llc. Ablation catheter. US8771269. May 8, 2008. Jul 8, 2014. Medtronic Ablation Frontiers Llc. RF ...
Minimally-invasive surgery to correct drug refractory atrial fibrillation appears to work better than catheter-based ablation ... Surgical ablation was significantly better than catheter ablation. A higher percentage of surgically treated patients were free ... Source Reference: Boersma L, et al "Atrial fibrillation catheter ablation versus surgical ablation treatment (FAST): a 2-center ... This small randomized trial compared catheter-based ablation and open surgical ablation for atrial fibrillation. All subjects ...
Jude Medical to initiate a clinical trial of the companys Duo irrigated ablation catheter for treatment of atrial fibrillation ... 1 between the companys Duo 12 port open irrigated catheter ablation system and an irrigated catheter ablation system that has ... Duo Ablation Catheter Going on Trial. February 3rd, 2010 Editors Cardiac Surgery, Cardiology ... The IRASE AF trial is the industrys first and the largest head-to-head IDE trial studying irrigated ablation catheters, which ...
Gordys heart doctor talked to him about catheter ablation, and specifically the Arctic Front® Cardiac CryoAblation Catheter, ... Catheter ablation is a minimally-invasive procedure in which energy terminates (ablates) the abnormal electrical pathways in ... The Arctic Front cryoablation catheter is a flexible thin tube that is maneuvered through a vessel into the left atrium. Once ... positioned in the heart, the balloon portion of the catheter is filled with a coolant which applies subzero temperatures to the ...
... with ablation catheters from Medtronic, is a minimally invasive procedure to treat atrial fibrillation. ... your doctor may recommend catheter ablation. Catheter ablation is a minimally invasive procedure that may lessen the number of ... there are benefits and risks with catheter ablation. An important benefit of successful catheter ablation is that you may ... Catheter ablation is a minimally invasive procedure in which the doctor threads a flexible thin tube (catheter) through the ...
Catheter Ablation at University of Maryland. Our program offers several advantages when it comes to catheter ablation:. * ... Heart Ablation Effectiveness. While it still depends on the type of arrhythmia, we are increasingly using catheter ablation for ... Catheter ablation provides a minimally invasive option when other approaches - such as regular checkups, lifestyle changes, ... A standard form of such ablation uses thin tubes (catheters) to reach the heart from a blood vessel. ...
Catheter Ablation of Ventricular Tachycardia Beneath an Endoventricular Patch Michifumi Tokuda, Jaimie Manlucu, Scott Brancato ... Wolff-Parkinson-White Syndrome in the Era of Catheter AblationCLINICAL PERSPECTIVEInsights From a Registry Study of 2169 ... Surgical Septal Myectomy Versus Alcohol Septal AblationAssessing the Status of the Controversy in 2014 Barry J. Maron and Rick ...
Catheter Ablation for Paroxysmal Atrial Fibrillation. Segmental Pulmonary Vein Ostial Ablation Versus Left Atrial Ablation. ... Background- Segmental ostial catheter ablation (SOCA) to isolate the pulmonary veins (PVs) and left atrial catheter ablation ( ... whereas left atrial ablation requires only a single catheter in the left atrium. Left atrial catheter ablation necessitates the ... Repeat Ablation Procedures. To minimize the risk of PV stenosis, a 4-mm-tip ablation catheter was used, and the power of ...
... called catheter ablation, for atrial fibrillation if medicine is not effective or not tolerated. Also discusses implanting a ... Should I Have Catheter Ablation?. AV node ablation. AV node ablation is a slightly different type of ablation procedure for ... catheter ablation did not stop your atrial fibrillation, or you cannot have catheter ablation. With AV node ablation, the ... Catheter Ablation for Atrial Fibrillation. Treatment Overview. Catheter ablation is a minimally invasive procedure to treat ...
  • A RF ablation catheter for removing athero-stenotic lesions or modifying the tissue characteristics of the interior walls of selected blood vessels is described. (google.co.uk)
  • The pressure exerted by the ablation catheter on the tissue has been shown to play an important role on determining the size and the potential efficacy of the ablation lesions. (clinicaltrials.gov)
  • With catheter ablation, lesions ('burns') are made around the opening of each pulmonary vein until there is no electrical conduction into the vein. (prweb.com)
  • Our analyses were primarily based on catheter ablation data collected during a multicenter, prospective, randomized clinical trial of the Chilli Cooled Ablation System (Cardiac Pathways Corporation, Sunnyvale, Calif). This catheter ablation system can create larger lesions than standard radiofrequency (RF) energy, 6 and recently was approved by the United States Food and Drug Administration for treating mappable VT attributable to ischemic heart disease or cardiomyopathy. (ahajournals.org)
  • When the targeted area is located, the tip of the catheter delivers cryo (cold) or radiofrequency (heat) energy to create lesions or scars. (medtronic.com)
  • For the creation of controllable larger ablation lesions, cooled tipped RF delivery has already been shown to be effective 10 while alternative forms of energy delivery capable of creating large lesions, such as ultrasound, laser, microwave and percutaneous cryotherapy, are at an early stage of development. (bmj.com)
  • Excess damage caused to the heart as a result of unnecessary ablation lesions will be limited, decreasing the likelihood of future complications. (clinicaltrials.gov)
  • This study is a prospective, single-arm, single-center, pilot study of bronchoscopic Radio-Frequency Ablation (RFA) treatment of target lung lesions, prior to surgical tumor resection. (clinicaltrials.gov)
  • The present invention eliminates many of the problems associated with previous ablation catheters by providing an ablation treatment not dependent upon continuous lesions. (patents.com)
  • Impact of ablation-associated clinically overt strokes or MRI-detected bus clincally 'silent' acute brain lesions on cognitive function after ablation [ Time Frame: appr. (clinicaltrials.gov)
  • lesions delivered at multiple sites based on multipolar catheter position within renal artery. (clinicaltrials.gov)
  • They explain that catheter ablation of paroxysmal AF is effective in more than 80% of cases, and persistent AF can often be dealt with thoracoscopically by pulmonary vein isolation and creating linear lesions. (thedoctorschannel.com)
  • In addition to the apparatus used for a "non-complex" ablation, these procedures often make use of sophisticated computer mapping systems to localize the source of the abnormal rhythm and to direct delivery of ablation lesions. (wikipedia.org)
  • The doctor threads thinner tubes (catheters) with electrodes into the sheath and toward the heart. (umm.edu)
  • The distal mapping section of the Achieve Mapping Catheter is a circular loop with eight evenly spaced electrodes for mapping electrical conduction between the left atrium and pulmonary veins. (medtronic.com)
  • The company's Globe catheter array consists of 122 individually controllable electrodes, allowing for single-shot ablation anywhere within the heart's left atrium, as well as high-definition anatomical and electrical mapping of the organ. (fiercebiotech.com)
  • The tip of the catheter has a spherical wire basket that has 64 evenly placed electrodes over the 8 splines that make up the basket. (wikipedia.org)
  • Interventional oncology has developed to a separate pillar of modern oncology and it employs X-ray, ultrasound, computed tomography (CT) or magnetic resonance imaging (MRI) to help guide miniaturized instruments (e.g. biopsy needles, ablation electrodes, intravascular catheters) to allow targeted and precise treatment of solid tumours (also known as neoplasms) located in various organs of the human body, including but not limited to the liver, kidneys, lungs, and bones. (wikipedia.org)
  • They are large and looming and will sandwich the patient, but are able to precisely control the position of the electrodes that are on the end of the catheters. (wikipedia.org)
  • This may be useful for the applications above and also for confirmation of targeting for placement of ventricular catheters, biopsies, or deep brain stimulation electrodes. (wikipedia.org)
  • The subjects of this study were 80 consecutive patients with symptomatic PAF selected to undergo catheter ablation. (ahajournals.org)
  • Despite the complications associated with catheter ablation, the authors explain that the long-term benefits in all-cause mortality, heart failure hospitalizations, and overall clinical outcomes must be weighed in clinical decision making. (eurekalert.org)
  • Catheter ablation involves advancing several flexible catheters into the patient's blood vessels, usually either in the femoral vein, internal jugular vein, or subclavian vein. (wikipedia.org)
  • They placed a right external jugular vein catheter, tunneling subcutaneously to exit from the patient's upper back, near the midline, just below his neck. (eurekalert.org)
  • Our new research shows the more successful we are in treating the abnormal rhythm through the process required with catheter ablation, the better chance we have of lowering a patient's long-term risk of stroke. (eurekalert.org)
  • During the ablation process, a catheter is snaked through the patient's body to the site of abnormal heart cells. (utah.edu)
  • The system is designed to visualise the real-time calculated position and orientation of a specialised RF ablation catheter within the patient's heart in order to minimise radiation exposure during fluoroscopy, increase the accuracy of targeted RF ablation and reacquisition of pacing sites for re-ablation. (wikipedia.org)
  • This force is then transferred over the entire length until it reaches the tip of the catheter within the patient's heart. (wikipedia.org)
  • The Sensei system operates by guiding standard catheters through a manipulated robotically steerable sheath (hollow tube) in the patient's vasculature. (wikipedia.org)
  • The Arctic Front cryoablation catheter is a flexible thin tube that is maneuvered through a vessel into the left atrium. (medtronic.com)
  • A proximal cooling chamber can be positioned proximally to a thermal mass for cooling a proximal portion of the catheter. (google.es)
  • In addition, or alternatively, a distal cooling chamber can be positioned for cooling a distal portion of the catheter tip. (google.es)
  • We have achieved some of the lowest complication rates associated with catheter ablation and less than ten percent of our patients in the last two years needed a repeat ablation, a rate less than half the average. (dukehealth.org)
  • One patient developed a transient ischaemic complication after ablation of a left lateral accessory pathway by transseptal approach. (bmj.com)
  • Recent studies have suggested an increasing trend in AFib ablation-related complication rates despite advances in catheter technology and operator experience," Cheng et al. (cardiovascularbusiness.com)
  • The ability to titrate catheter contact force using the Sensei system's built-in pressure sensor technology (called intellisense) may allow operators to maximise the chance of creating effective burns across the thickness of the atrial wall, whilst minimising the risk of complication. (wikipedia.org)
  • ORLANDO -- Minimally-invasive surgery to correct drug refractory atrial fibrillation appears to work better than catheter-based ablation techniques, researchers said here. (medpagetoday.com)
  • Catheter ablation provides a minimally invasive option when other approaches - such as regular checkups, lifestyle changes, brief external shocks ( cardioversion ) or medications - do not work. (umm.edu)
  • Rising market penetration of ablation and diagnostic catheters in developing countries of Asia Pacific and Latin America will positively impact industry expansion. (openpr.com)