Atrioventricular block. Medical search

Impaired impulse conduction from HEART ATRIA to HEART VENTRICLES. AV block can mean delayed or completely blocked impulse conduction.

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.

A device designed to stimulate, by electric impulses, contraction of the heart muscles. It may be temporary (external) or permanent (internal or internal-external).

Cardiac arrhythmias that are characterized by excessively slow HEART RATE, usually below 50 beats per minute in human adults. They can be classified broadly into SINOATRIAL NODE dysfunction and ATRIOVENTRICULAR BLOCK.

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.

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.

Regulation of the rate of contraction of the heart muscles by an artificial pacemaker.

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.

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.

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.

The measurement of magnetic fields generated by electric currents from the heart. The measurement of these fields provides information which is complementary to that provided by ELECTROCARDIOGRAPHY.

A condition caused by dysfunctions related to the SINOATRIAL NODE including impulse generation (CARDIAC SINUS ARREST) and impulse conduction (SINOATRIAL EXIT BLOCK). It is characterized by persistent BRADYCARDIA, chronic ATRIAL FIBRILLATION, and failure to resume sinus rhythm following CARDIOVERSION. This syndrome can be congenital or acquired, particularly after surgical correction for heart defects.

A malignant form of polymorphic ventricular tachycardia that is characterized by HEART RATE between 200 and 250 beats per minute, and QRS complexes with changing amplitude and twisting of the points. The term also describes the syndrome of tachycardia with prolonged ventricular repolarization, long QT intervals exceeding 500 milliseconds or BRADYCARDIA. Torsades de pointes may be self-limited or may progress to VENTRICULAR FIBRILLATION.

A condition of fainting spells caused by heart block, often an atrioventricular block, that leads to BRADYCARDIA and drop in CARDIAC OUTPUT. When the cardiac output becomes too low, the patient faints (SYNCOPE). In some cases, the syncope attacks are transient and in others cases repetitive and persistent.

A plant genus of the family ERICACEAE.

A transient loss of consciousness and postural tone caused by diminished blood flow to the brain (i.e., BRAIN ISCHEMIA). Presyncope refers to the sensation of lightheadedness and loss of strength that precedes a syncopal event or accompanies an incomplete syncope. (From Adams et al., Principles of Neurology, 6th ed, pp367-9)

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.

A class I anti-arrhythmic agent (one that interferes directly with the depolarization of the cardiac membrane and thus serves as a membrane-stabilizing agent) with a depressant action on the heart similar to that of guanidine. It also possesses some anticholinergic and local anesthetic properties.

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.

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.

Pathophysiological conditions of the FETUS in the UTERUS. Some fetal diseases may be treated with FETAL THERAPIES.

Abnormal accumulation of serous fluid in two or more fetal compartments, such as SKIN; PLEURA; PERICARDIUM; PLACENTA; PERITONEUM; AMNIOTIC FLUID. General fetal EDEMA may be of non-immunologic origin, or of immunologic origin as in the case of ERYTHROBLASTOSIS FETALIS.

Methods to induce and measure electrical activities at specific sites in the heart to diagnose and treat problems with the heart's electrical system.

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.

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.

A plant genus of the family APOCYNACEAE. It is a very poisonous plant that contains cardioactive agents.

Prenatal interventions to correct fetal anomalies or treat FETAL DISEASES in utero. Fetal therapies include several major areas, such as open surgery; FETOSCOPY; pharmacological therapy; INTRAUTERINE TRANSFUSION; STEM CELL TRANSPLANTATION; and GENETIC THERAPY.

A form of CARDIAC MUSCLE disease in which the ventricular walls are excessively rigid, impeding ventricular filling. It is marked by reduced diastolic volume of either or both ventricles but normal or nearly normal systolic function. It may be idiopathic or associated with other diseases (ENDOMYOCARDIAL FIBROSIS or AMYLOIDOSIS) causing interstitial fibrosis.

Irregular HEART RATE caused by abnormal function of the SINOATRIAL NODE. It is characterized by a greater than 10% change between the maximum and the minimum sinus cycle length or 120 milliseconds.

The number of times the HEART VENTRICLES contract per unit of time, usually per minute.

MYOCARDIAL INFARCTION in which the inferior wall of the heart is involved. It is often caused by occlusion of the right coronary artery.

Recording of the moment-to-moment electromotive forces of the heart on a plane of the body surface delineated as a vector function of time.

A condition that is characterized by episodes of fainting (SYNCOPE) and varying degree of ventricular arrhythmia as indicated by the prolonged QT interval. The inherited forms are caused by mutation of genes encoding cardiac ion channel proteins. The two major forms are ROMANO-WARD SYNDROME and JERVELL-LANGE NIELSEN SYNDROME.

The heart rate of the FETUS. The normal range at term is between 120 and 160 beats per minute.

A generic expression for any tachycardia that originates above the BUNDLE OF HIS.

Inflammatory processes of the muscular walls of the heart (MYOCARDIUM) which result in injury to the cardiac muscle cells (MYOCYTES, CARDIAC). Manifestations range from subclinical to sudden death (DEATH, SUDDEN). Myocarditis in association with cardiac dysfunction is classified as inflammatory CARDIOMYOPATHY usually caused by INFECTION, autoimmune diseases, or responses to toxic substances. Myocarditis is also a common cause of DILATED CARDIOMYOPATHY and other cardiomyopathies.

Interruption of NEURAL CONDUCTION in peripheral nerves or nerve trunks by the injection of a local anesthetic agent (e.g., LIDOCAINE; PHENOL; BOTULINUM TOXINS) to manage or treat pain.

Disturbance in the atrial activation that is caused by transient failure of impulse conduction from the SINOATRIAL NODE to the HEART ATRIA. It is characterized by a delayed in heartbeat and pauses between P waves in an ELECTROCARDIOGRAM.

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.

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.

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)

Developmental abnormalities in any portion of the VENTRICULAR SEPTUM resulting in abnormal communications between the two lower chambers of the heart. Classification of ventricular septal defects is based on location of the communication, such as perimembranous, inlet, outlet (infundibular), central muscular, marginal muscular, or apical muscular defect.

A condition characterized by the thickening of ENDOCARDIUM due to proliferation of fibrous and elastic tissue, usually in the left ventricle leading to impaired cardiac function (CARDIOMYOPATHY, RESTRICTIVE). It is most commonly seen in young children and rarely in adults. It is often associated with congenital heart anomalies (HEART DEFECTS CONGENITAL;) INFECTION; or gene mutation. Defects in the tafazzin protein, encoded by TAZ gene, result in a form of autosomal dominant familial endocardial fibroelastosis.

A sweet viscous liquid food, produced in the honey sacs of various bees from nectar collected from flowers. The nectar is ripened into honey by inversion of its sucrose sugar into fructose and glucose. It is somewhat acidic and has mild antiseptic properties, being sometimes used in the treatment of burns and lacerations.

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.

A CATHETER-delivered implant used for closing abnormal holes in the cardiovascular system, especially HEART SEPTAL DEFECTS; or passageways intentionally made during cardiovascular surgical procedures.

Ultrasonic recording of the size, motion, and composition of the heart and surrounding tissues. The standard approach is transthoracic.

Determination of the nature of a pathological condition or disease in the postimplantation EMBRYO; FETUS; or pregnant female before birth.

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.

Autoantibodies directed against various nuclear antigens including DNA, RNA, histones, acidic nuclear proteins, or complexes of these molecular elements. Antinuclear antibodies are found in systemic autoimmune diseases including systemic lupus erythematosus, Sjogren's syndrome, scleroderma, polymyositis, and mixed connective tissue disease.

A form of CARDIAC MUSCLE disease, characterized by left and/or right ventricular hypertrophy (HYPERTROPHY, LEFT VENTRICULAR; HYPERTROPHY, RIGHT VENTRICULAR), frequent asymmetrical involvement of the HEART SEPTUM, and normal or reduced left ventricular volume. Risk factors include HYPERTENSION; AORTIC STENOSIS; and gene MUTATION; (FAMILIAL HYPERTROPHIC CARDIOMYOPATHY).

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).

Procedures in which placement of CARDIAC CATHETERS is performed for therapeutic or diagnostic procedures.

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.

Modified cardiac muscle fibers composing the terminal portion of the heart conduction system.

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).

The chambers of the heart, to which the BLOOD returns from the circulation.

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).

This structure includes the thin muscular atrial septum between the two HEART ATRIA, and the thick muscular ventricular septum between the two HEART VENTRICLES.

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.

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).

An adrenergic beta-antagonist that is used in the treatment of life-threatening arrhythmias.

A voltage-gated sodium channel subtype that mediates the sodium ion PERMEABILITY of CARDIOMYOCYTES. Defects in the SCN5A gene, which codes for the alpha subunit of this sodium channel, are associated with a variety of CARDIAC DISEASES that result from loss of sodium channel function.

Imaging of a ventricle of the heart after the injection of a radioactive contrast medium. The technique is less invasive than cardiac catheterization and is used to assess ventricular function.

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.

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.

The hollow, muscular organ that maintains the circulation of the blood.

A form of CARDIAC MUSCLE disease that is characterized by ventricular dilation, VENTRICULAR DYSFUNCTION, and HEART FAILURE. Risk factors include SMOKING; ALCOHOL DRINKING; HYPERTENSION; INFECTION; PREGNANCY; and mutations in the LMNA gene encoding LAMIN TYPE A, a NUCLEAR LAMINA protein.

Elements of limited time intervals, contributing to particular results or situations.

Developmental abnormalities involving structures of the heart. These defects are present at birth but may be discovered later in life.

Surgical insertion of synthetic material to repair injured or diseased heart valves.

An idiopathic systemic inflammatory granulomatous disorder comprised of epithelioid and multinucleated giant cells with little necrosis. It usually invades the lungs with fibrosis and may also involve lymph nodes, skin, liver, spleen, eyes, phalangeal bones, and parotid glands.

The abrupt cessation of all vital bodily functions, manifested by the permanent loss of total cerebral, respiratory, and cardiovascular functions.

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.

A nucleoside that is composed of ADENINE and D-RIBOSE. Adenosine or adenosine derivatives play many important biological roles in addition to being components of DNA and RNA. Adenosine itself is a neurotransmitter.

A standard and widely accepted diagnostic test used to identify patients who have a vasodepressive and/or cardioinhibitory response as a cause of syncope. (From Braunwald, Heart Disease, 7th ed)

The innermost layer of the heart, comprised of endothelial cells.

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.

Fetal ECG: a novel predictor of atrioventricular block in anti-Ro positive pregnancies. (1/265)

OBJECTIVE: Approximately 2.8% of pregnancies are Ro/La antibody positive. 3-15% of fetuses develop complete heart block (CHB). First-degree atrioventricular heart block (1 degrees AVB) is reported in a third of Ro/La fetuses but as most have a normal postnatal ECG this may reflect inadequacies of Doppler measurement techniques. METHODS: Comparison was made between mechanical (mPR) and electrical (ePR) intervals obtained prospectively using Doppler and non-invasive fetal ECG (fECG) in 52 consecutive Ro/La pregnancies in 46 women carrying 54 fetuses in an observational study at a fetal medicine unit. 121 mPR and 37 ePR intervals were recorded in 49 Ro/La fetuses. Five were referred with CHB and excluded. ePR was measured successfully in 35/37 (94%) and mPR was measured in all cases. 1 degrees AVB was defined as PR >95% CI. Logistic regression predicted abnormal final fetal rhythm from first mPR or ePR. RESULTS: The ePR model gave 66.7% sensitivity (6 of 8 final abnormal fetal rhythm cases were predicted correctly in fetuses >20 weeks) and 96.2% specificity. mPR gave 44.4% sensitivity (4 of 9 cases) and 88.5% specificity. Z scores for ePR (zPR) were calculated from 199 normal fetuses. The area under the receiver operator characteristic (ROC) curve was 0.88 (95% CI, 0.754 to 1.007). A cut-off of 1.65 gave a sensitivity of 87.5% and specificity of 95% for those with prolonged and normal ePR intervals, respectively. CONCLUSION: zPR is better than mPR at differentiating between normal and prolonged PR intervals, suggesting that fECG is the diagnostic tool of choice to investigate the natural history and therapy of conduction abnormalities in Ro/La pregnancies. (+info)

Tachycardia after pacemaker implantation in a patient with complete atrioventricular block. (2/265)

The atrioventricular (AV) node allows ante- and retrograde conduction between atria and ventricles. It is commonly assumed that these AV nodal conduction properties go hand in hand. However, ante- and retrograde AV conduction can be completely independent from each other in individual patients. We report about a patient with permanent AV block III degrees requiring implantation of a pacemaker. As soon as a dual-chamber device was connected to the implanted leads, a tachycardia started at the maximum tracking rate, which was subsequently reprogrammed from 120 to 170 bpm. Non-invasive electrophysiologic testing showed that this patient demonstrated 1:1 ventriculoatrial (VA) conduction up to 170 bpm leading to endless loop tachycardia (ELT) while the antegrade AV block III degrees persisted. This case impressively illustrates that one has to take into account that patients with antegrade AV block III degrees may still have a high VA conduction capacity leading to ELT. Dual-chamber devices therefore have to be programmed accordingly, activating dedicated reactions after ventricular premature beats and automatic ELT detection and termination algorithms. (+info)

Randomized comparison of bipolar vs unipolar plus bipolar recordings during atrioventricular junction ablation: importance and efficacy of unipolar recording. (3/265)

BACKGROUND: No prior studies have clarified the utility and efficacy of unipolar recording for identifying successful sites for atrioventricular junction (AVJ) ablation. METHODS AND RESULTS: Thirty-six patients underwent radiofrequency (RF) AVJ ablation for drug-resistant atrial fibrillation (AF) or AF/flutter. AVJ ablation was performed with either bipolar (Bi-group; n=18) or unipolar plus bipolar recording (Uni-group; n=18). In the Uni-group, the primary parameter used to select ablation sites was a QS or rS morphology of the His bundle unipolar recording. There was no significant difference between the 2 groups for the bipolar electrogram characteristics at the successful ablation site. However, in the Uni-group, the procedure time and fluoroscopy duration were shorter (both p<0.05), and the total number of RF energy applications less (p<0.05) than in the Bi-group. In the Uni-group, unipolar His bundle recordings could be assessed in 26 (76%) of 34 RF energy applications: Complete atrioventricular block was obtained at 15 (83%) of 18 sites with QS morphology and in 3 (37%) of 8 sites with rS morphology on the unipolar His bundle recording. CONCLUSIONS: AVJ ablation can be achieved more efficiently and with fewer RF energy applications when guided by unipolar recordings than by bipolar recordings alone. (+info)

Safety of and tolerance to adenosine infusion for myocardial perfusion single-photon emission computed tomography in a Japanese population. (4/265)

BACKGROUND: Adenosine has been available for use in myocardial perfusion single-photon emission computed tomography (SPECT) in Japan since 2005. The purpose of this study was to evaluate the safety of and tolerance to thallium-201 myocardial perfusion SPECT with intravenous adenosine infusion in Japanese patients with suspected coronary artery disease. METHODS AND RESULTS: Two hundred and six consecutive patients who underwent an adenosine infusion (120 mug . kg(-1) . min(-1)) SPECT at Sumitomo Besshi Hospital (Niihama, Japan) were investigated. The effects of adenosine infusion were monitored for each patient. A coronary angiography was performed in 81 patients. Adenosine infusion significantly decreased blood pressure and increased heart rate. Adverse reactions were observed in 161 patients (78.2%). Most reactions were transient, disappearing soon after the termination of adenosine infusion. No serious adverse reactions, such as acute myocardial infarction or death, occurred. Adenosine infusion was terminated in 3 patients (1.5%) because of near syncope or sustained 2:1 atrioventricular block. Electrocardiographic changes occurred in 15 patients (7.3%). Self-assessed scoring after SPECT showed that the patients were very tolerant (74.6% of 177 patients) of adenosine infusion myocardial SPECT. The sensitivity and specificity were 75.0% and 69.7%, respectively. CONCLUSIONS: Adenosine infusion myocardial SPECT is safe and well tolerated in the Japanese population, despite the frequent occurrence of minor adverse reactions. (+info)

Sinus node function in children with congenital complete atrioventricular block. (5/265)

AIMS: Children with congenital complete atrioventricular block (CCAVB) often need pacemaker therapy. In these children, it may be preferable to use single-lead VDD pacing, but for VDD pacing a normal sinus node function is required. Our aim was to study sinus node function in children with CCAVB. METHODS AND RESULTS: We longitudinally evaluated sinus rate in 36 children with CCAVB and normal anatomy of the heart. The rate of sinus rhythm on a 12-lead ECG, in Holter recordings, and exercise tests were evaluated at regular intervals. Age at the first visit of the children was 2.5+/-3.3 years (mean+/-SD). Follow-up was 10.6+/-7.3 years. The rate of sinus rhythm on a 12-lead ECG was at every age within the normal values for age (e.g. 0-1 year: 153+/-24 bpm, and 17-18 years: 76+/-4 bpm). Lowest and highest sinus rates in the Holter recordings were normal. During exercise, mean sinus rate in the total group of children increased from 92+/-8 at rest to 171+/-9 bpm at maximal exercise. CONCLUSION: We conclude that sinus node function is normal in children with CCAVB. Because of the normal increase in sinus rate during exercise, a single-lead VDD pacemaker can be safely implanted in these children. (+info)

Acute and chronic effects of cardiac resynchronization in patients developing heart failure with long-term pacemaker therapy for acquired complete atrioventricular block. (6/265)

AIMS: We assessed the effects of cardiac re-synchronization therapy (CRT) in patients who developed otherwise unexplained heart failure (HF) during right ventricular apical (RVA)-pacing for acquired complete atrioventricular block (CAVB). METHODS AND RESULTS: Eighteen consecutive CAVB patients with HF during RVA-pacing were assessed with haemodynamic studies immediately and 12 months after CRT-upgrade. Ten patients had idiopathic CAVB and 13 showed normal left ventricular (LV) function at RVA-pacemaker implantation. HF developed after 81 +/- 10 months. RVA-pacing duration correlated (r = 0.49, P < 0.05) with LV ejection fraction (LVEF) deterioration. Biventricular- (BiV) and LV-pacing acutely improved the systolic function comparably, but only BiV improved diastolic function. One-year post-CRT-initiation, New York Heart Association classification improved 35 +/- 3% (P < 0.05) and the number of hospitalizations decreased 85 +/- 3% (P < 0.0001). CRT decreased LV end-diastolic diameter (LVEDd) 7 +/- 2% (P < 0.01) and increased LVEF by 23 +/- 7% (P < 0.01). The CRT-induced reduction in LVEDd tended to be greater in patients with RVA-pacing for < 5 years vs. > 5 years (7.7 +/- 2.5 vs. 3.6 +/- 1.0 mm, P = 0.08). CONCLUSION: CRT-upgrade improves the cardiac function and symptoms in CAVB patients with HF progression related to RVA-pacing. Because adverse LV-remodelling may be partly irreversible, consideration should be given to BiV- and LV-pacing upgrade as soon as possible after the indications appear, and prospective studies of the optimal timing of CRT-upgrade may be useful. (+info)

Transient atrioventricular block shortly after uneventful cryoablation of atrioventricular nodal re-entrant tachycardias: report of two cases. (7/265)

We report two patients with atrioventricular (AV) nodal re-entrant tachycardias who developed transient AV block immediately after uneventful cryoablation of the slow pathway was completed. No tachycardia recurrences were observed after an asymptomatic follow-up of 12 months and 10 months, respectively. This is the first report of this unexpected, transient phenomenon. The exact mechanism(s) remain(s) unclear. (+info)

A randomized trial comparing two different approaches of pacemaker selection. (8/265)

AIMS: DDD-pacemakers are favoured in patients with sick-sinus-syndrome or AV-block. However, AAI-pacemakers for sick-sinus-syndrome or VDD-pacemakers for AV-block may provide similar benefit with lower costs. The aim is to show that a tailored approach (TA) with arrhythmia-specific pacemaker selection was equal to a standard approach (SA) regarding quality of life (QoL) at lower costs. METHODS AND RESULTS: The study was prospective and randomized with QoL as primary endpoint. Secondary endpoints were a combined endpoint of all-cause mortality, worsening heart failure or angina, atrial fibrillation (AF), stroke, these endpoints individually and costs. Of 198 patients (age 77 +/- 10 years, 43% female, ejection fraction 54 +/- 12%, follow-up 38 +/- 15 months), 94 were randomized to SA and 104 to TA. Thirty-two patients (34%) died in the SA group vs. 25 (24%) in the TA (P= ns). QoL showed no differences in all dimensions. The combined secondary endpoint was reached more frequently with SA (51%) compared to TA (37%, P = 0.045). There was no difference regarding all single secondary endpoints. Hardware costs were reduced by 15% (P < 0.0001). CONCLUSION: In long-term follow-up, a TA is equal to SA regarding the primary endpoint QoL and secondary endpoints as AF and mortality. Depending on the healthcare system, it may significantly reduce costs. (+info)

ISBN 978-93-5152-140-2. "Atrioventricular Block". The Lecturio Medical Concept Library. Retrieved 3 July 2021. Khairy P, ... P waves first degree atrioventricular block manifesting as a prolonged PR-interval low amplitude QRS complexes in the right ... This can lead to abnormal heart rhythms including atrioventricular re-entrant tachycardia.[citation needed] Other abnormalities ... precordial leads atypical right bundle branch block T wave inversion in V1-V4 and Q waves in V1-V4 and II, III and aVF. An ...

https://en.wikipedia.org/wiki/Ebstein's_anomaly

Sauer WH (3 June 2021). Link MS, Yeon SB (eds.). "Etiology of Atrioventricular block". UpToDate. Retrieved March 10, 2022. ... Common complications First degree heart block Second degree heart block Third degree heart block (Complete heart block) ... Second degree heart block commonly progresses to complete heart block. Second degree heart block can also reverse on its own. ... Fetal heart block treatment varies based on the degree. First degree heart block is usually treated with glucocorticoids, but ...

https://en.wikipedia.org/wiki/Neonatal_lupus_erythematosus

Lev M (1964). "Anatomic basis for atrioventricular block". Am J Med. 37 (5): 742-8. doi:10.1016/0002-9343(64)90022-1. PMID ... Lenegre J (1964). "Etiology and pathology of bilateral bundle branch block in relation to complete heart block". Prog ... Heart block Schott JJ, Alshinawi C, Kyndt F, et al. (1999). "Cardiac conduction defects associate with mutations in SCN5A". Nat ... Lev's disease is an acquired complete heart block due to idiopathic fibrosis and calcification of the electrical conduction ...

https://en.wikipedia.org/wiki/Lev's_disease

Atrioventricular difference of moricizine block". Vascular Pharmacology. 38 (3): 131-41. doi:10.1016/S1537-1891(02)00213-6. ... March 2002). "Analysis of moricizine block of sodium current in isolated guinea-pig atrial myocytes. ...

https://en.wikipedia.org/wiki/Moracizine

Ufberg, JW; Clark, JS (February 2006). "Bradydysrhythmias and atrioventricular conduction blocks". Emerg. Med. Clin. North Am. ... AV conduction disturbances (AV block; primary AV block, secondary type I AV block, secondary type II AV block, tertiary AV ... The clinical relevance pertaining to AV blocks is greater than that of SA blocks. Beta blocker medicines also can slow the ... Pathological causes include sinus bradycardia, sinus arrest, sinus exit block, or AV block. Idioventricular rhythm, also known ...

https://en.wikipedia.org/wiki/Bradycardia

Chacón suffered from dextrocardia and an atrioventricular block. Université Laval "Ministra de Defensa: Carme Chacón Piqueras ...

https://en.wikipedia.org/wiki/Carme_Chacón

"Cause of atrioventricular block in patients after heart transplantation". Transplantation journal. "USC AGSA Dinner Dance and ... He co-authored a research article in the peer-reviewed journal Transplantation on "Cause of Atrioventricular Block in Patients ...

https://en.wikipedia.org/wiki/Armen_Margarian

Other lethal cardiovascular effects include bradycardia, hypotension, and atrioventricular block. Dyspnea, and prostration may ... Quinidine is an example of a Na channel blocker which may be helpful in curing heart block. USDA, NRCS (n.d.). "Rhododendron ...

https://en.wikipedia.org/wiki/Rhododendron_arborescens

"Walter Gaskell and the understanding of atrioventricular conduction and block". J Am Coll Cardiol. 39 (10): 1574-1580. doi: ... "Walter Gaskell and the understanding of atrioventricular conduction and block". American College of Cardiology Foundation. ... introduction of the concept of heart block and the experimental demonstration of the myogenic origin of the heartbeat. His ...

https://en.wikipedia.org/wiki/W._H._Gaskell

"Woldemar Mobitz and His 1924 classification of second-degree atrioventricular block". Circulation. 110 (9): 1162-7. doi:10.1161 ... Mobitz included 2 : 1, 3 : 1 AV block in his type II classification, and indicated the serious nature of type II block and its ... With type II block (Mobitz type II), all conducted beats show a constant, typically normal PR interval, and conduction to the ... The forms of second degree AV block are named after him for him. Mobitz was born on May 31, 1889 in St. Petersburg, Russia. He ...

https://en.wikipedia.org/wiki/Woldemar_Mobitz

... block is the most common cardiac conduction deficit. This often progresses to a Third-degree atrioventricular block, which is a ... Symptoms of heart block include syncope, exercise intolerance, and bradycardia.[citation needed] Kearns-Sayre patients are ... KEARNS TP; SAYRE GP (1958). "Retinitis Pigmentosa, External Ophthalmoplegia, and Complete Heart Block Unusual Syndrome with ... deafness and heart block". The American Journal of Medicine. 29 (5): 888-893. doi:10.1016/0002-9343(60)90122-4. PMID 13789175. ...

https://en.wikipedia.org/wiki/Kearns–Sayre_syndrome

He also contributed to Karel Frederik Wenckebach's work on what is now known as second-degree atrioventricular block of the ... "Woldemar Mobitz and His 1924 Classification of Second-Degree Atrioventricular Block". Circulation. 110 (9): 1162-7. doi:10.1161 ... heart in which Wenckebach described the periodicity of this block as "Luciani periodicity." http://www.ibro.org/Pub/Pub_Main_ ...

https://en.wikipedia.org/wiki/Luigi_Luciani

Kii Y, Ito T (May 2002). "Drug-induced ventricular tachyarrhythmia in isolated rabbit hearts with atrioventricular block". ...

https://en.wikipedia.org/wiki/Mosapride

"Torsades de pointes complicating atrioventricular block: evidence for a genetic predisposition". Heart Rhythm. 4 (2): 170-4. ... hERG, and IKr, are highly susceptible to block by a range of structurally diverse pharmacological agents. This property means ...

https://en.wikipedia.org/wiki/KCNE2

Barold SS, Lüderitz B (June 2001). "John Hay and the earliest description of type II second-degree atrioventricular block". Am ... In 1905 he identified a form of second degree AV block. In 1907 he was appointed Assistant Physician and set up the first ...

https://en.wikipedia.org/wiki/John_Hay_(cardiologist)

It is contraindicated in patients with AV (atrioventricular) heart block or digoxin toxicity. Bretylium should be used only in ... It also acts by blocking K+ channels and is considered a class III antiarrhythmic. The dose is 5-10 mg/kg and side effects are ... It blocks the release of noradrenaline from nerve terminals. In effect, it decreases output from the peripheral sympathetic ...

https://en.wikipedia.org/wiki/Bretylium

Khoury MY, Moukarbel GV, Obeid MY, Alam SE (May 2001). "Effect of aminophylline on complete atrioventricular block with ...

https://en.wikipedia.org/wiki/Adenosine_A2A_receptor

... second-degree atrioventricular block. An example of irregular intermittent (irregularly irregular) pulse is atrial fibrillation ... An unequal pulse between upper and lower extremities is seen in coarctation to aorta, aortitis, block at bifurcation of aorta, ... partial heart block etc. Intermittent dropping out of beats at pulse is called "intermittent pulse". Examples of regular ... complete heart block, aortic regurgitation), decreased distensibility of arterial system (as seen in atherosclerosis, ...

https://en.wikipedia.org/wiki/Pulse

When it is administered intravenously, adenosine causes transient heart block in the atrioventricular (AV) node. This is ... Adenosine is one of the four nucleoside building blocks of RNA (and its derivative deoxyadenosine is a building block of DNA), ... If this has no effect (i.e., no evidence of transient AV block), a dose of 12 mg can be given 1-2 minutes after the first dose ... Caffeine acts by blocking binding of adenosine to the adenosine A1 receptor, which enhances release of the neurotransmitter ...

https://en.wikipedia.org/wiki/Adenosine

Others include: QT prolongation, bundle branch block, first-degree atrioventricular block, and even sinus tachycardia. It may ...

https://en.wikipedia.org/wiki/Calcium_channel_blocker_toxicity

Arrhythmias such as tachycardia, bradycardia, atrioventricular block, and premature ventricular beats have also been reported. ... Ranitidine is an H2 histamine receptor antagonist that works by blocking histamine, thus decreasing the amount of acid released ...

https://en.wikipedia.org/wiki/Ranitidine

"The bee venom peptide tertiapin underlines the role of IKACh in acetylcholine-induced atrioventricular blocks". British Journal ... This α-helix is plugged into the external end of the conduction pore, thereby blocking the channel. The N-terminal of the ... Excessive stimulation with acetylcholine can induce an AV-block in the heart as shown in guinea pigs, which can be prevented by ... Tertiapin is a 21-amino acid peptide isolated from venom of the European honey bee (Apis mellifera). It blocks two different ...

https://en.wikipedia.org/wiki/Tertiapin

Overdose of Drotaverine potentially can cause atrioventricular (AV) block, cardiac arrest, paralysis of respiratory system. In ...

https://en.wikipedia.org/wiki/Drotaverine

Types of bradyarrhythmias sinus bradycardia: normal rhythm, slow rate atrioventricular block first degree: prolonged PR ... obstruction of a pulmonary artery or a branch of the pulmonary arteries most commonly by a clot causing blocked flow of blood ...

https://en.wikipedia.org/wiki/Pediatric_advanced_life_support

Features also seen on the ECG include right atrial enlargement and varying degrees of atrioventricular block. When a person is ... Endocardial cushion defects are associated with abnormalities of the atrioventricular valves (the mitral valve and the ... but it is more commonly classified as an atrioventricular septal defect. Hemodynamically significant ASDs (flow ratio 1.5:1) ... suspected of having an ASD based on the findings of an incomplete right bundle branch block with a rSr' or rSR', the frontal ...

https://en.wikipedia.org/wiki/Ostium_primum_atrial_septal_defect

When hyperstimulated, the left vagal branch predisposes the heart to conduction block at the atrioventricular node. At this ... "Device blocking stomach nerve signals shows promise in obesity" (Press release). Mayo Clinic. Archived from the original on 8 ... In a six-month open-label trial involving three medical centers in Australia, Mexico, and Norway, vagus nerve blocking helped ... Vagus nerve blocking (VBLOC) therapy is similar to VNS but used only during the day. ...

https://en.wikipedia.org/wiki/Vagus_nerve

Atrioventricular Block at eMedicine This article incorporates text from the CC-BY book: OpenStax College, Anatomy & Physiology ... Drugs known as calcium channel blockers slow HR by binding to these channels and blocking or slowing the inward movement of ... HR= 1,500 number of large blocks Heart rate monitors allow measurements to be taken continuously and can be used during ... A very slow heart rate (bradycardia) may be associated with heart block. It may also arise from autonomous nervous system ...

https://en.wikipedia.org/wiki/Heart_rate

It is characterized by sinoatrial node dysfunction and may include atrioventricular node disease and bundle branch block. ... Chalazion* is a granuloma that forms in the eyelid due to blocked secretions from the meibomian gland. Inflammation of the ... Dysplasia of the mitral and tricuspid valves - also known as the atrioventricular (AV) valves - can appear as thickened, ... Congenital vertebral anomalies, including butterfly, block, and transitional vertebrae, and hemivertebrae, are a collection of ...

https://en.wikipedia.org/wiki/List_of_dog_diseases

Where the problem is atrioventricular block (AVB) the pacemaker is required to detect (sense) the atrial beat and after a ... Temporary epicardial pacing is used during open heart surgery should the surgical procedure create atrio-ventricular block. The ... it is anticipated that leadless dual-chamber pacing for patients with atrioventricular block will become possible with further ... The equivalent atrial pacing mode is AAI or AAIR which is the mode of choice when atrioventricular conduction is intact but the ...

https://en.wikipedia.org/wiki/Artificial_cardiac_pacemaker

Furthermore, beta-blockers should be avoided in patients with atrioventricular blocks unless a pacemaker has been implanted. In ... Similarly, calcium channel blockers should also be avoided in patients with atrioventricular blocks unless a pacemaker has been ... However, AV node ablation creates a complete heart block and requires the placement of a permanent pacemaker. Administration of ... These agents act to suppress atrial rate and decrease conduction through the atrioventricular node, thereby slowing the ...

https://en.wikipedia.org/wiki/Multifocal_atrial_tachycardia

First IL-6-blocking drug nears approval for rare blood disorder, Nature Medicine, October 7, 2013 ... been shown that the reduction of abdominal obesity by exercise in human adults can be reversed by the IL-6 receptor blocking ...

https://en.wikipedia.org/wiki/Interleukin_6

... is usually caused by sinoatrial node dysfunction or block or atrioventricular block.[17] ... Electrocardiogram (ECG) finds that should be looked for include signs of heart ischemia, arrhythmias, atrioventricular blocks, ... However, while an ECG may identify conditions such as atrial fibrillation, heart block, or a new or old heart attack, it ... Adams-Stokes syndrome is a cardiac syncope that occurs with seizures caused by complete or incomplete heart block. Symptoms ...

https://en.m.wikipedia.org/wiki/Syncope_

Sinoatrial block）. *AV *1°. *2°（英语：Second-degree atrioventricular block） ... Heart block（英语：Heart block）: Sinoatrial（英语： ... Bundle branch block（英语：Bundle branch block） *Right. *Left（英语： ...

https://zh.wikipedia.org/wiki/心脏病

These are also known as AV blocks, because the vast majority of them arise from pathology at the atrioventricular node. They ... or by blocking of the electrical impulse on its way from the atria to the ventricles (AV block or heart block). Heart block ... Third-degree heart block, also known as complete heart block. First, second, and third-degree blocks also can occur at the ... First-degree heart block, which manifests as PR prolongation. *Second-degree heart block *Type 1 Second degree heart block, ...

https://en.wikipedia.org/wiki/Cardiac_dysrhythmia

Second degree heart block *Type 1 Second degree heart block, also known as Mobitz I or Wenckebach ... Rhythms produced by an ectopic focus in the atria, or by the atrioventricular node, are the least dangerous dysrhythmias; but ...

https://new.m.wikipedia.org/wiki/कार्दियाक_अरिदमिया

There may be atrio-ventricular disassociation with more ventricular signals than atrial signals. The cause of JET is felt to be ... For instance, if the atria are electrically activated at 300 beats per minute, half those electrical impulses are blocked by ... In this case the right bundle branch block was present during tachycardia and during normal sinus rhythm. ... There may a 1:1 relationship between atria and ventricular activity with a short RP interval, or atrioventricular dissociation ...

https://en.wikipedia.org/wiki/Junctional_ectopic_tachycardia

Atrioventricular conduction disease (AV block) describes impairment of the electrical continuity between the atria and ... November 2007). "Abnormal Conduction and Morphology in the Atrioventricular Node of Mice With Atrioventricular Canal-Targeted ... Atrioventricular nodal re-entry tachycardia, which is caused by a dual AV node physiology and AVNRT can only occur in people ... Cystic tumour of atrioventricular nodal region (CTAVN) CTAVN is of endodermal origin and occurs exclusively in the area of the ...

https://en.wikipedia.org/wiki/Atrioventricular_node

... third degree 426.11 Atrioventricular block, first degree 426.12 Atrioventricular block, Mobitz II 426.13 Atrioventricular block ... left 426.4 Bundle branch block, right 426.6 Sinoatrial heart block 426.7 Atrioventricular excitation, anomalous Wolff-Parkinson ... diseases classified elsewhere 425.9 Secondary cardiomyopathy unspecified 426 Conduction disorders 426.0 Atrioventricular block ...

https://en.wikipedia.org/wiki/List_of_ICD-9_codes_390–459:_diseases_of_the_circulatory_system

Congenital l Congenital heart block Congenital heart disease ptosis hypodontia craniostosis Congenital heart disease radio ... Compartment syndrome Complement component 2 deficiency Complement component receptor 1 Complete atrioventricular canal Complex ...

https://en.wikipedia.org/wiki/List_of_diseases_(C)

Lyme carditis in 19-87% of people adversely impacts the heart's electrical conduction system, causing atrioventricular block ... About half the people with Lyme carditis progress to complete heart block, but it usually resolves in a week. Other Lyme heart ... About 94% of people have full recovery, but 5% need a permanent pacemaker and 1% end up with persistent heart block (the actual ... "Fatal Lyme carditis and endodermal heterotopia of the atrioventricular node". Postgraduate Medical Journal. 66 (772): 134-6. ...

https://en.wikipedia.org/wiki/Lyme_disease

... and atrioventricular block) Allergic/toxic: skin rash, photosensitivity, liver damage of the cholestatic type (rarely), ... along with blocking histamine, acetylcholine, and serotonin. Doxepin was approved for medical use in the United States in 1969 ...

https://en.wikipedia.org/wiki/Doxepin

First-degree atrioventricular block (First-degree AV block, PR prolongation) Heart block Inappropriate sinus tachycardia ... Atherosclerosis Atrial flutter Atrial septal defect Atrioventricular canal defect Atrioventricular septal defect Avascular ... ISBN 0-07-242903-8. Olshansky, Brian; Sandesara, C; Quick, A; Barzallo, A. (2009-06-11). "Atrioventricular Nodal Reentry ... and Lange-Nielsen syndrome Junctional escape beat Junctional rhythm Left bundle branch block Left anterior fascicular block ...

https://en.wikipedia.org/wiki/List_of_circulatory_system_conditions

The agents work by prolonging the Effective Refractory Period (ERP) either by blocking sodium ions (Class I drugs) or by ... the atrioventricular node - which regulates heart rate, and to implant a pacemaker instead. This "ablate and pace" technique ... The intention was to eliminate AF by using incisional scars to block abnormal electrical circuits (atrial macroreentry) that AF ... Rate control is achieved with medications that work by increasing the degree of block at the level of the AV node, effectively ...

https://en.wikipedia.org/wiki/Management_of_atrial_fibrillation

If the SA node does not function, or the impulse generated in the SA node is blocked before it travels down the electrical ... Impulses from the sinus node reach the atrioventricular node which acts as the secondary pacemaker. The cells of the AV node ... Cardiac arrhythmias can cause heart block, in which the contractions lose any useful rhythm. In humans, and sometimes in other ... This center is typically represented by cells inside the atrioventricular node (AV node), which is an area between the atria ...

https://en.wikipedia.org/wiki/Cardiac_pacemaker

Congenital Heart Surgeons' Society Congenital heart block Hoffman JI, Kaplan S (June 2002). "The incidence of congenital heart ... Aortic stenosis Arrhythmogenic right ventricular cardiomyopathy Atrial septal defect (ASD) Atrioventricular septal defect (AVSD ... Obstructive defects occur when heart valves, arteries, or veins are abnormally narrow or blocked. Common defects include ... and atrioventricular septal defects.[citation needed] Congenital heart defects are known by a number of names including ...

https://en.wikipedia.org/wiki/Congenital_heart_defect

Su AI, Wiltshire T, Batalov S, Lapp H, Ching KA, Block D, Zhang J, Soden R, Hayakawa M, Kreiman G, Cooke MP, Walker JR, ... In-situ hybridization of the human transcriptome indicates expression is highest in the atrioventricular node, followed by the ...

https://en.wikipedia.org/wiki/C1orf112

However, it may show wide QRS complexes on the ECG if a bundle branch block is present. At high rates, the QRS complex may also ... Adrenergic storm Anaemia Anxiety Atrial fibrillation Atrial flutter Atrial tachycardia Atrioventricular reentrant tachycardia ...

https://en.wikipedia.org/wiki/Tachycardia

HR Atrioventricular canal defect; 600309; AVSD1 Atrioventricular septal defect; 600309; GJA1 Atrioventricular septal defect, ... WFS1 Heart block, nonprogressive; 113900; SCN5A Heart block, progressive, type IA; 113900; SCN5A Heinz body anemia; 140700; ... POLG Progressive familial heart block, type IB; 604559; TRPM4 Proguanil poor metabolizer; 609535; CYP2C Prolidase deficiency; ... TLL1 Atrial septal defect with atrioventricular conduction defects; 108900; NKX2E Atrial septal defect-2; 607941; GATA4 ...

https://en.wikipedia.org/wiki/List_of_OMIM_disorder_codes

... is usually caused by sinoatrial node dysfunction or block or atrioventricular block. Blockages in major vessels or within the ... Adams-Stokes syndrome is a cardiac syncope that occurs with seizures caused by complete or incomplete heart block. Symptoms ... Bradycardia can be caused by heart blocks. Tachycardias include SVT (supraventricular tachycardia) and VT (ventricular ...

https://en.wikipedia.org/wiki/Syncope_(medicine)

It occurs when the rate of depolarization of the sinoatrial node falls below the rate of the atrioventricular node. This ... It can also occur following a premature ventricular contraction or blocked premature atrial contraction. Junctional rhythms (if ... or a complete AV block.[citation needed] Rate: 35-60 bpm Rhythm: Irregular in single junctional escape complex; regular in ... dysrhythmia also may occur when the electrical impulses from the SA node fail to reach the AV node because of SA or AV block. ...

https://en.wikipedia.org/wiki/Junctional_escape_beat

The calcium blocking activity of AH-1058 can decrease ventricular contractility, heart rate, and conductance through the ... atrioventricular conduction > sinoatrial automaticity (level of sinoatrial self-activation). Takahara A, Uneyama H, Sasaki N, ... Dohmoto H, Takahara A, Uneyama H, Yoshimoto R (February 2003). "Cardiac Ca(2+) channel-blocking effects of the cyproheptadine ... It is derived from cyproheptadine, a compound with known antiserotonic, antihistaminic and calcium channel blocking properties ...

https://en.wikipedia.org/wiki/AH-1058

This may be preceded by first-degree AV block, second-degree AV block, bundle branch block, or bifascicular block. In addition ... Atrioventricular block First-degree AV block Second-degree AV block "ECG Conduction Abnormalities". Retrieved 2009-01-07. " ... Third-degree atrioventricular block (AV block) is a medical condition in which the electrical impulse generated in the ... OCLC 915775025.{{cite book}}: CS1 maint: others (link) "Third-Degree Atrioventricular Block (Complete Heart Block) Treatment & ...

https://en.wikipedia.org/wiki/Third-degree_atrioventricular_block

This condition is sometimes confused with sinoatrial block, a condition in which the pacing impulse is generated, but fails to ... such as the atrio-ventricular junction or the ventricles, begins pacing and restores the heart action. This condition can be ...

https://en.wikipedia.org/wiki/Sinoatrial_arrest

... the shortness of breath is due to a blunted heart rate response to exertion caused by excessive atrioventricular node-blocking ... Rate control is achieved with medications that work by increasing the degree of the block at the level of the AV node, ... A heartbeat results when an electrical impulse from the atria passes through the atrioventricular (AV) node to the ventricles ... In addition to these agents, amiodarone has some AV node blocking effects (in particular when administered intravenously) and ...

https://en.wikipedia.org/wiki/Atrial_fibrillation

Patients with NKX2-5 mutations commonly present AV conduction block and atrial septal defects (ASD). Recently, postnatal roles ... atrioventricular (AV) valve formation, and maintenance of AV conduction. Mutations in expression are associated with congenital ... "Cooperative action of Tbx2 and Nkx2.5 inhibits ANF expression in the atrioventricular canal: implications for cardiac chamber ...

https://en.wikipedia.org/wiki/Homeobox_protein_Nkx-2.5

... to second-degree atrioventricular block, and certain electrolyte imbalances: hypokalemia (low blood potassium levels), ...

https://en.wikipedia.org/wiki/Digitoxin

... block, or first-degree heart block, is defined as prolongation of the PR interval on an electrocardiogram (ECG) to more than ... First-degree atrioventricular block is associated with advanced atrioventricular block, atrial fibrillation and left ... encoded search term (First-Degree Atrioventricular Block) and First-Degree Atrioventricular Block What to Read Next on Medscape ... First-degree atrioventricular (AV) block, or first-degree heart block, is defined as prolongation of the PR interval on an ...

https://www.medscape.com/answers/161829-196930/what-is-the-global-prevalence-of-first-degree-atrioventricular-av-block

... called an atrioventricular (AV) block. P waves show that the top of the heart received electrical activity. ... When a P wave is present and not followed by a QRS wave (and heart contraction), there is an atrioventricular block, and a very ... This picture shows an ECG (electrocardiogram, EKG) of a person with an abnormal rhythm (arrhythmia) called an atrioventricular ... AV) block. P waves show that the top of the heart received electrical activity. Each P wave is usually followed by the tall ( ...

https://medlineplus.gov/ency/imagepages/1429.htm

... block occurs when atrial depolarizations fail to reach the ventricles or when atrial depolarization is conducted with a delay. ... Atrioventricular Block. This rhythm strip shows third-degree atrioventricular block (complete heart block). The atrial rate is ... Atrioventricular Block. Third-degree atrioventricular block (complete heart block). The atrial rate is faster than the ... Atrioventricular Block. This rhythm strip shows first-degree atrioventricular block with a PR interval of 0.360 sec. Note the ...

http://emedicine.medscape.com/article/151597-clinical

... block, or second-degree heart block, is a disorder characterized by disturbance, delay, or interruption of atrial impulse ... conduction to the ventricles through the atrioventricular node (AVN). Electrocardiographically, some P waves are not followed ... Second-Degree Atrioventricular Block. Mobitz II atrioventricular (AV) block with intermittent periods of 2:1 AV block. If only ... Second-Degree Atrioventricular Block. Sinus rhythm with Mobitz I second-degree 3:2 infranodal atrioventricular (AV) block and ...

https://emedicine.medscape.com/article/161919-differential

His EKG showed a complete atrioventricular block with a ventricular escape rate of 35 bpm and a QRS wave duration of 140 ms ( ... We report 2 cases of an advanced atrioventricular block in young adult patients in Israel who sought care for acute Q fever ... Badarni K, Blich M, Atiya-nasagi Y, Ghanem-zoubi N. Acute Q Fever with Atrioventricular Block, Israel. Emerg Infect Dis. 2022; ... Electrocardiogram of a a 48-year-old patient in Israel with Q fever, showing a complete atrioventricular block with ventricular ...

https://wwwnc.cdc.gov/eid/article/28/9/21-2565_article

First-degree Atrioventricular Block. First-degree Atrioventricular Block. For first-degree block, conduction between the atrium ...

https://www.merckmanuals.com/home/multimedia/table/first-degree-atrioventricular-block

Termination of "ventricular" arrhythmias from digoxin by selective production of complete atrioventricular block with ... Termination of ventricular arrhythmias from digoxin by selective production of complete atrioventricular block with ... Termination of "ventricular" arrhythmias from digoxin by selective production of complete atrioventricular block with ... Termination of "ventricular" arrhythmias from digoxin by selective production of complete atrioventricular block with ...

https://jpet.aspetjournals.org/content/211/3/561/tab-e-letters

Atrioventricular block complete is found among people who take Ketek, especially for people who are male, 60+ old, have been ... What is Atrioventricular block complete?. Atrioventricular block complete (heart block complete) is found to be associated with ... Ketek and Atrioventricular block complete - a phase IV clinical study of FDA data Summary:. Atrioventricular block complete is ... How severe was Atrioventricular block complete and when was it recovered:. *Atrioventricular block complete in Ketek ...

https://www.ehealthme.com/ds/ketek/atrioventricular-block-complete/

The importance of clinical setting and mechanism of block. ... Significance of high degree atrioventricular block in acute ... Significance of high degree atrioventricular block in acute posterior myocardial infarction. The importance of clinical setting ...

https://scholars.duke.edu/display/pub804738

Second-degree AV block may occur in many different patterns, and the block may be physiologically located at any level between ... block occurs when regular atrial systoles (ie, non-premature atrial systoles) intermittently fail to conduct to the ventricles ... encoded search term (Pediatric Second-Degree Atrioventricular Block) and Pediatric Second-Degree Atrioventricular Block What to ... non-Wenckebach AV block (or Mobitz II AV block) is said to be present. This block is usually located more distally in the His ...

https://emedicine.staging.medscape.com/article/890621-differential

New life-saving treatments for Fetal atrioventricular block in clinical trial on Surveillance and Treatment to Prevent Fetal ...

https://clinicaltrials.med.nyu.edu/clinicaltrial/1341/surveillance-treatment-prevent-fetal/?qd=14195228

https://www.staging.medscape.com/answers/161919-111873/what-is-the-role-of-aortic-valve-replacement-in-the-etiology-of-second-degree-atrioventricular-av-block

https://wwwnc-origin.cdc.gov/eid/article/28/9/21-2565_article

N2 - Background Blocked atrial bigeminy (BAB) and second-degree atrioventricular block with 2:1 conduction block (2:1 AVB) both ... AB - Background Blocked atrial bigeminy (BAB) and second-degree atrioventricular block with 2:1 conduction block (2:1 AVB) both ... Background Blocked atrial bigeminy (BAB) and second-degree atrioventricular block with 2:1 conduction block (2:1 AVB) both ... abstract = "Background Blocked atrial bigeminy (BAB) and second-degree atrioventricular block with 2:1 conduction block (2:1 ...

https://www.scholars.northwestern.edu/en/publications/magnetophysiologic-and-echocardiographic-comparison-of-blocked-at

Complete atrioventricular block during thoracic endovascular aortic repair. Authors: Shyu, Hao-Nung. Li, Po-Han. Liu, Shih-Kai ... However, perioperative complete atrioventricular block occurred and soon progressed to ST-elevation myocardial infarction. In ... Complete atrioventricular block during thoracic endovascular aortic repair. Annals of Cardiac Anaesthesia. 2019 Jul; 22(3): 325 ...

https://imsear.searo.who.int/handle/123456789/185833

Bloc atrioventricular -

https://farmacie-naturista.ro/bloc-atrioventricular/pagina-1/

keywords = "Complete atrioventricular block, dilated cardiomyopathy, pacemakers, right ventricular apical pacing",. author = " ... Dilated Cardiomyopathy After Long-Term Right Ventricular Apical Pacing in Children With Complete Atrioventricular Block: Role ... Dilated Cardiomyopathy After Long-Term Right Ventricular Apical Pacing in Children With Complete Atrioventricular Block: Role ... Dilated Cardiomyopathy After Long-Term Right Ventricular Apical Pacing in Children With Complete Atrioventricular Block : Role ...

https://tmu.pure.elsevier.com/en/publications/dilated-cardiomyopathy-after-long-term-right-ventricular-apical-p

Coronary Sinus Pacing in Patients after Tricuspid Valve Surgery with Complete Atrioventricular Block. PubMed, SCI, Scopus, ESCI ... Coronary Sinus Pacing in Patients after Tricuspid Valve Surgery with Complete Atrioventricular Block. Author(s): Anna Rydlewska ...

https://www.fortunejournals.com/abstract/coronary-sinus-pacing-in-patients-after-tricuspid-valve-surgery-with-complete-atrioventricular-block-831.html

... block occurs when atrial depolarizations fail to reach the ventricles or when atrial depolarization is conducted with a delay. ... Atrioventricular Block. This rhythm strip shows third-degree atrioventricular block (complete heart block). The atrial rate is ... Atrioventricular Block. This rhythm strip shows third-degree atrioventricular block (complete heart block). The atrial rate is ... Atrioventricular Block. Third-degree atrioventricular block (complete heart block). The atrial rate is faster than the ...

https://emedicine.staging.medscape.com/article/151597-overview

Atrioventricular Block. NFPA 1582 considers left bundle branch block and right bundle branch block to potentially compromise a ... Given the Engineers atrial fibrillation, pulmonary embolism, full-dose anticoagulation treatment, atrioventricular block, beta ... atrioventricular block, hypertension, beta blocker therapy, and diabetes mellitus.. Pulmonary Embolism. In December 2010, the ... The Engineer was diagnosed with incomplete right bundle branch block in 2006 and incomplete left bundle branch block in 2010. ...

https://www.cdc.gov/niosh/fire/reports/face201129.html

The AVB I (first degree AV block) criterion can be programmed to: rest + exercise (the device may switch to DDD during rest and ... Episodes of switch to DDD for first degree AV block (AVB1) recorded in AIDA (memory of the device) ...

https://www.cardiocases.com/en/pacingdefibrillation/traces/pm/microport-crm-sorin/switch-first-degree-atrioventricular-block

Other Causes of atrioventricular block. The following are the less common causes of atrioventricular block: *cardiac ... Risk Factors for atrioventricular block. The following factors may increase the likelihood of atrioventricular block: *young ... Occurrence of atrioventricular block. Common Age Group. atrioventricular block can occur at any age. ... Complications of atrioventricular block if untreated. Yes, atrioventricular block causes complications if it is not treated. ...

https://www.tabletwise.net/health/atrioventricular-block

High-grade atrioventricular block in acute coronary syndromes: insights from the Global Registry of Acute Coronary Events. ... High-grade atrioventricular block (HAVB) is historically considered a marker of worse outcomes in patients with ST-segment ... High-degree atrioventricular block complicating ST segment elevation myocardial infarction in the contemporary era. Vincent ... High-degree atrioventricular block complicating ST-segment elevation myocardial infarction in the era of primary percutaneous ...

https://read.qxmd.com/read/28267964/incidence-predictors-and-outcomes-of-high-grade-atrioventricular-block-in-patients-with-st-segment-elevation-myocardial-infarction-undergoing-primary-percutaneous-coronary-intervention-from-the-horizons-ami-trial

BLOCK MOBITZ TYPE 1 (Wenckebach): A progressive slowing of the conduction from the atria to the ventricles through the ... atrioventricular (AV) node with an eventual interruption of atrial impulse conduction. •AV node fatigues which lengthens the PR ... A progressive slowing of the conduction from the atria to the ventricles through the atrioventricular (AV) node with an ...

https://www.ecgedu.com/glossary/second-degree-atrioventricular-av-block-mobitz-type-1-wenckebach/

5.2 Bradycardia and Atrio-ventricular Block 5.3 Liver Enzyme Elevations 5.4 Proarrhythmia 5.5 Pulmonary Disorders 5.6 Loss of ... 5.2 Bradycardia and Atrio-ventricular Block. In 90 (4.9%) of 1836 patients in clinical trials, drug-related bradycardia that ... Second- or third-degree atrio-ventricular (AV) block unless a functioning pacemaker is available. ... Second- or third-degree atrio-ventricular (AV) block unless a functioning pacemaker is available. ...

https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=51772745-9ea9-42cd-97e6-7266f41ae3ca&audience=consumer

... atrioventricular block, bundle branch block, sick sinus syndrome, pulmonary hypertension. - Ear and labyrinth disorders: ... ECG findings include atrioventricular, right or left bundle branch block. PLAQUENIL has a potential to prolong the QT interval ... atrioventricular block, cardiac arrest and death. • Life-threatening hypotension is common. • Severe hypokalemia secondary to ... including neonatal lupus and congenital heart block.. Data Human Data Data from published epidemiologic and clinical studies ...

https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=34496b43-05a2-45fb-a769-52b12e099341&audience=consumer

Heart Blocks - Learn about the causes, symptoms, diagnosis & treatment from the MSD Manuals - Medical Consumer Version. ... Whats an atrioventricular (AV) block? An AV block occurs at or near the AV node. AV blocks have 3 levels, depending on how ... What are the symptoms of a heart block? Most heart blocks dont cause symptoms. If you have a severe heart block, you may feel ... Some people are born with a heart block. Other people develop a heart block later in life. Heart blocks can be caused by damage ...

https://www.msdmanuals.com/en-kr/home/quick-facts-heart-and-blood-vessel-disorders/abnormal-heart-rhythms/heart-blocks

Myocardial bridging as a cause of paroxysmal atrioventricular block. J Am Coll Cardiol 1(3):965-969. ...

https://www.cdc.gov/niosh/fire/reports/face201222.html

New life-saving treatments for Fetal atrioventricular block in clinical trial on Surveillance and Treatment to Prevent Fetal ...

https://clinicaltrials.med.nyu.edu/clinicaltrial/1341/surveillance-treatment-prevent-fetal/?section=elg&qd=10010037

Trigemino-Cardiac Reflex and High-Degree Atrioventricular Block in Recurrent Epistaxis ...

https://www.journalmc.org/index.php/JMC/article/view/2957/2295

Atrioventricular block as the initial manifestation of cardiac sarcoidosis in middle-aged adults. (medscape.com)
Role of cardiac pacing in congenital complete heart block. (medscape.com)
Primary cardiac lymphoma presenting with atrioventricular block. (medscape.com)
We report 2 patients in Israel who had acute Q fever and advanced atrioventricular block as the cardiac manifestation. (cdc.gov)
Second-degree atrioventricular (AV) block, or second-degree heart block, is a disease of the cardiac conduction system in which the conduction of atrial impulse through the AV node and/or His bundle is delayed or blocked. (medscape.com)
The atrioventricular canal (AVC) is the site where key structures responsible for functional division between heart regions are established, most importantly, the atrioventricular (AV) conduction system and cardiac valves. (gov.pl)
2 ]. Cardiac involvement can present with erally held in a semiflexed position, and the heart block, frequently inclate 20c or early child typically begins walking on tiptoe [ 2 ]. (who.int)
Cardiac ablation is not performed because of the increased risk for iatrogenic heart block secondary to competing electrical signals. (clinicaladvisor.com)
Cardiac manifestations include congestive heart failure, new heart murmur, and atrioventricular block. (bmj.com)

[ 2 ] In first-degree AV block, every atrial impulse is transmitted to the ventricles, resulting in a regular ventricular rate. (medscape.com)
Electrocardiogram of a a 48-year-old patient in Israel with Q fever, showing a complete atrioventricular block with ventricular escape rate of 35 bpm and a QRS duration of 140 ms. (cdc.gov)
His EKG showed a complete atrioventricular block with a ventricular escape rate of 35 bpm and a QRS wave duration of 140 ms ( Figure 1 ). (cdc.gov)
Termination of "ventricular" arrhythmias from digoxin by selective production of complete atrioventricular block with physostigmine in the dog. (aspetjournals.org)
Background Blocked atrial bigeminy (BAB) and second-degree atrioventricular block with 2:1 conduction block (2:1 AVB) both present as ventricular bradycardia and can be difficult to distinguish by echocardiography. (northwestern.edu)
Second- or third-degree atrio-ventricular (AV) block unless a functioning pacemaker is available. (nih.gov)
Treatment with exogenous Ca2+, from calcium-chloride, induced second or third degree atrioventricular blocks and ventricular fibrillation. (cdc.gov)
Reactiile adverse cardiovasculare se manifesta prin bradicardie, hipertensiune sau hipotensiune arteriala, tulburari de ritm ventricular, tulburari de conducere (bloc atrio-ventricular). (eprospect.ro)

Significance of high degree atrioventricular block in acute posterior myocardial infarction. (duke.edu)
Differential Clinical Implications of High-Degree Atrioventricular Block Complicating ST-Segment Elevation Myocardial Infarction according to the Location of Infarction in the Era of Primary Percutaneous Coronary Intervention. (qxmd.com)
High-degree atrioventricular block complicating ST-segment elevation myocardial infarction in the era of primary percutaneous coronary intervention. (qxmd.com)

First-degree AV block occurs in fewer than 15% of patients with acute MI admitted to coronary care units. (medscape.com)
We report 2 cases of an advanced atrioventricular block in young adult patients in Israel who sought care for acute Q fever without evidence of myocarditis. (cdc.gov)
Hypersensitivity, sick sinus syndrome, sinus bradycardia (rate slower than 50 per minute), atrioventricular block (degree II and III), arterial hypotension, acute or chronic heart failure, peripheral blood flow disorders, breastfeeding. (canadianbopharmacy.com)
Acute onset, high-grade (2nd or 3rd degree) atrioventricular conduction defects that resolve in days to weeks and are sometimes associated with myocarditis. (cdc.gov)

Because of his symptomatic atrioventricular block, a permanent pacemaker was implanted. (cdc.gov)
Ventriculoatrial conduction and related pacemaker-mediated arrhythmias in patients implanted for atrioventricular block: an old problem revisited. (medscape.com)
Diagnostic electrophysiologic testing can help determine the level of the block and the potential need for a permanent pacemaker. (medscape.com)
Treatment involves correction or resolution of underlying causes and, if AV block is progressive, symptomatic, and/or persistent, a pacemaker is required. (medscape.com)
Genomic and physiological analyses of the zebrafish atrioventricular canal reveal molecular building blocks of the secondary pacemaker region. (gov.pl)
On the ECG there was atrial with a pacemaker being the typical form of flutter with 3:1 atrioventricular block. (who.int)
Complete atrioventricular block in pregnancy: report of seven pregnancies in a patient without pacemaker. (bvsalud.org)
Intravenous antibiotics treatment began to resolve the atrioventricular block (AV block) and a planned pacemaker operation was canceled. (medlineplus.gov)

When a P wave is present and not followed by a QRS wave (and heart contraction), there is an atrioventricular block, and a very slow pulse (bradycardia). (medlineplus.gov)
Any level of AV block leading to profound bradycardia may also lead to life-threatening torsade de pointes (TdP). (medscape.com)
Second-degree AV block may manifest as bradycardia (Mobitz II), irregularity of the heart rate (Mobitz I), or a variable pulse and variable neck vein distention. (medscape.com)
Third-degree AV block may be associated with profound bradycardia. (medscape.com)
Early-onset pentamidine-associated second-degree heart block and sinus bradycardia: case report and review of the literature. (medscape.com)
Electrocardiogram of a 23-year-old patient in Israel with Q fever, showing a left bundle branch block with sinus bradycardia of 35 bpm. (cdc.gov)
Bradycardia and AV block: Treat by slowing the infusion rate or discontinuing amiodarone. (nih.gov)
Palpitations, bradycardia, bundle branch block, or myocarditis alone are not criteria for cardiovascular involvement. (cdc.gov)
The patient has no contraindications such as prolonged PR interval, high grade AV block, bradycardia, hypotension, or heart failure. (blogspot.com)

This picture shows an ECG (electrocardiogram, EKG) of a person with an abnormal rhythm (arrhythmia) called an atrioventricular (AV) block. (medlineplus.gov)
Marked sinus arrhythmia is also often mistaken for second-degree AV block. (medscape.com)

The atrioventricular node (AVN) is the only normal electrical connection between the atria and the ventricles. (medscape.com)
Atrioventricular (AV) block is an interruption or delay of electrical conduction from the atria to the ventricles due to conduction system abnormalities in the AV node or the His-Purkinje system. (medscape.com)
A progressive slowing of the conduction from the atria to the ventricles through the atrioventricular (AV) node with an eventual interruption of atrial impulse conduction. (ecgedu.com)
Your heart's conduction system carries electrical signals from the atrium through a gateway called the AV node (atrioventricular node). (msdmanuals.com)
An AV block occurs at or near the AV node. (msdmanuals.com)

Berdajs D, Schurr UP, Wagner A, Seifert B, Turina MI, Genoni M. Incidence and pathophysiology of atrioventricular block following mitral valve replacement and ring annuloplasty. (medscape.com)

Hypersensitivity, cardiogenic shock, atrioventricular block (degree II and III), sick sinus syndrome, bradicardia (heart rate less than 50 per minute), severe hypotension, disorders of peripheral blood flow of patients who are treated with MAO inhibitors, patients with chronic heart failure (heart rate less than 60 per minute) pregnancy, breastfeeding, children younger than 12 y.o. (canadianiopharmacy.com)

Wolff L, Parkinson J, White P. Bundle-branch block with short P-R interval in healthy young people prone to paroxysmal tachycardia. (bmj.com)

Routine physical examination does not lead to the diagnosis of first-degree atrioventricular (AV) block. (medscape.com)
The differential diagnosis of second-degree atrioventricular (AV) block is limited, although the potential etiologies may widely vary. (medscape.com)
See Clinical Presentation and Workup for more specific information on the diagnosis of AV block. (medscape.com)
Material and methods: Sixty-seven children with the diagnosis of atrioventricular septal defect were hospitalised at the Department of Paediatric Cardiology, Medical University in Gdańsk, in 1993-1998. (medscimonit.com)
The diagnosis is long QT syndrome (LQTS) complicated by 2/1 atrioventricular block. (bmj.com)

Persistent second-degree atrioventricular block following adenosine infusion for nuclear stress testing. (medscape.com)
In contrast, dipyridamole induces vasodilation indirectly, by blocking adenosine reuptake and increasing endogenous adenosine. (cdc.gov)

We suspected infectious etiology because of his history of a febrile illness preceding the atrioventricular block occurrence. (cdc.gov)
Familial occurrence of accessory atrioventricular pathways (preexcitation syndrome). (bmj.com)

Zebeta contains active ingredient Bisoprolol Fumarate and belongs to a class of drugs called beta-adrenergic receptor blocking agents. (canadianiopharmacy.com)

Electrophysiological characteristics of fetal atrioventricular block. (medscape.com)
Sacks JH, Samai C, Gomez K, Kanaan U. Maternal antibody-associated fetal second-degree heart block and atrial flutter: case report and review. (medscape.com)
Conclusions Fetal BAB and 2:1 AV block can be difficult to distinguish using echocardiography because in many fetuses with BAB the mechanical rhythm does not accurately reflect the magnetic rhythm. (northwestern.edu)
Atrioventricular block during fetal heart rate decelerations. (bmj.com)
Of the ten cases with fetal arrythmias, five fetuses had tachyarrhythmias, four had ectopics and one fetus had congenital heart block in association with maternal lupus. (springeropen.com)

The degree atrioventricular (AV) block is generally associated with the severity of symptoms and clinical history. (medscape.com)
Common presentations and symptoms are outlined below for the different types of AV block. (medscape.com)
Patients with second-degree AV block may be asymptomatic or they may experience variety of symptoms such as lightheadedness and syncope. (medscape.com)
Symptoms of AV block range from no symptoms to weakness, fatigue, shortness of breath, exercise intolerance, or syncope. (medscape.com)
It is possible that atrioventricular block shows no physical symptoms and still is present in a patient. (tabletwise.net)

Atrioventricular block complete is reported only by a few people who take Ketek. (ehealthme.com)
The phase IV clinical study analyzes which people take Ketek and have Atrioventricular block complete. (ehealthme.com)
Among them, 4 people (0.09%) have Atrioventricular block complete. (ehealthme.com)
What is Atrioventricular block complete? (ehealthme.com)
Atrioventricular block complete (heart block complete) is found to be associated with 1,358 drugs and 768 conditions by eHealthMe. (ehealthme.com)
Do you take Ketek and have Atrioventricular block complete? (ehealthme.com)
Mobitz type II AV block may progress to complete heart block, with an associated increased risk of mortality. (medscape.com)
However, perioperative complete atrioventricular block occurred and soon progressed to ST-elevation myocardial infarction. (who.int)
Background: Pediatric patients paced for complete atrioventricular block (CAVB) are at risk of developing dilated cardiomyopathy (DCM). (elsevier.com)
During third-degree ("complete") AV block, no AV conduction occurs when it should be able to occur. (medscape.com)
Death due to asystole is possible in complete heart block. (medscape.com)
Complete atrioventricular block, Parkinson's disease. (pediatriconcall.com)
The analysed group included 20 children with partial atrioventricular septal defect (group I) and 47 children with complete AVSD (group II). (medscimonit.com)
3. The correction of the congenital heart disease such as atrioventricular septal defect should be completed in the first 6 months of life, particularly in children with complete AVSD. (medscimonit.com)
Those waves were signaling a complete heart block, something only a small percentage of Lyme disease patients' experience. (medlineplus.gov)

First-degree atrioventricular (AV) block , or first-degree heart block, is defined as prolongation of the PR interval on an electrocardiogram (ECG) to more than 200 msec. (medscape.com)

Narula OS, Samet P. Wenckebach and Mobitz type II A-V block due to block within the His bundle and bundle branches. (medscape.com)
Woldemar Mobitz and His 1924 classification of second-degree atrioventricular block. (medscape.com)
Mobitz type I and II atrioventricular blocks during fingolimod therapy. (medscape.com)
Belem L de S, Inacio CA. Second degree atrioventricular block Mobitz type I after administration of benzathine penicillin: case report. (medscape.com)
Evaluating for stability of the sinus rate is important because conditions associated with increases in vagal tone may cause simultaneous sinus slowing and AV block and, therefore, mimic a Mobitz II block. (medscape.com)
In addition, diagnosing Mobitz II block in the presence of a shortened post-block PR interval is impossible. (medscape.com)
This type is subdivided into Mobitz I (Wenckebach), Mobitz II, 2:1, paroxysmal, and high-grade AV block. (medscape.com)

His bundle electrocardiographic studies have shown that, in most of these patients, the AVN is the site of conduction block. (medscape.com)

Thus, as shown in electrophysiologic studies, PR interval prolongation (ie, first-degree AV block) may be due to conduction delay within the right atrium, the AVN, the His-Purkinje system, or a combination of these. (medscape.com)
Long-term outcomes in individuals with prolonged PR interval or first-degree atrioventricular block. (medscape.com)
The normalized coupling interval of the ectopic beat (PP′ of the blocked beat to PP of the conducted beat) was 0.29 ± 0.03. (northwestern.edu)
His admission ECG (fig 1 in questions) shows sinus rhythm, a major prolongation of the QTc interval (660 ms in S2), and a 2/1 atrioventricular block. (bmj.com)
If the block is functional in nature, it will disappear after QT interval shortening under β block. (bmj.com)
The 2/1 atrioventricular block persisted despite QTc interval shortening (460 ms in S2) (fig 1). (bmj.com)

A 7-day continuous ambulatory ECG monitor is placed after starting metoprolol and reveals resolution of all second-degree AV block type I and second- degree AV block type II arrhythmias but a continuation of SVT. (clinicaladvisor.com)

Natural history of chronic second-degree atrioventricular nodal block. (medscape.com)

Atrioventricular canal (end. (adam.com)

Suda K, Raboisson MJ, Piette E, Dahdah NS, Miro J. Reversible atrioventricular block associated with closure of atrial septal defects using the Amplatzer device. (medscape.com)
Affected newborns have various combinations of conduction defects such as RBBB and AV block. (aacnjournals.org)

High-grade atrioventricular block (HAVB) is historically considered a marker of worse outcomes in patients with ST-segment elevation myocardial infarction (STEMI). (qxmd.com)

Differentiating ECG AV block into its subtypes of Wenckebach, non-Wenckebach, 2:1, or high-grade AV is very important. (medscape.com)

AV block can mean delayed or completely blocked impulse conduction. (bvsalud.org)

The long QT syndrome with impaired atrioventricular conduction: a malignant variant in infants. (bmj.com)
Infants with long QT syndrome and 2:1 atrioventricular block. (bmj.com)
Homozygotous mutation of the SCN5A gene responsible for congenital long QT syndrome with 2/1 atrioventricular block. (bvsalud.org)

This ECG shows a first degree atrioventricular (AV) block with right bundle branch block (RBBB), atrial enlargement, and QT prolongation. (aacnjournals.org)

Del Valle I, Hoang V, Wood ST. A case of Lyme carditis with variable heart block successfully treated with oral doxycycline. (medscape.com)
Anti-SSA/Ro and anti-SSB/La antibody-mediated congenital heart block. (medscape.com)
Progressive familial heart block type II (PFHBII): a clinical profile from 1977 to 2003. (medscape.com)
What is a heart block? (msdmanuals.com)
There are many different types of heart block. (msdmanuals.com)
A heart block can occur in any part of the conduction system. (msdmanuals.com)
Some people are born with a heart block. (msdmanuals.com)
Other people develop a heart block later in life. (msdmanuals.com)
What are the types of heart block? (msdmanuals.com)

Cui G, Kobashigawa J, Margarian A. Cause of atrioventricular block in patients after heart transplantation. (medscape.com)
In patients with slow heart rates and heart blocks, Tenormin can slow up heart rates considerably. (canadianbopharmacy.com)

Doctors group heart blocks based on what part of the conduction system is involved and how severe they are. (msdmanuals.com)

AV block is categorized as first-, second-, and third-degree AV block. (medscape.com)
For more in-depth clinical information, see Third-Degree Atrioventricular Block . (medscape.com)

Perinatal outcome of fetus with isolated congenital second degree atrioventricular block without maternal anti-SSA/Ro-SSB/La antibodies. (medscape.com)

Well-trained athletes can demonstrate first-degree (and occasionally higher degree) AV block owing to an increase in vagal tone. (medscape.com)
First-degree atrioventricular block is associated with heart failure and death in persons with stable coronary artery disease: data from the Heart and Soul Study. (medscape.com)
Barold SS, Herweg B. Second-degree atrioventricular block revisited. (medscape.com)
Doutreleau S, Pistea C, Lonsdorfer E, Charloux A. Exercise-induced second-degree atrioventricular block in endurance athletes. (medscape.com)
Van Herendael B, Van Herendael H, De Raedt H. Second-degree atrioventricular block as the first sign of sarcoidosis in a previously asymptomatic patient. (medscape.com)
For first-degree block, conduction between the atrium (P) and ventricle (QRS) is slowed without skipped beats. (merckmanuals.com)
Atrial tachycardias with second-degree block or nonconducted premature atrial stimuli are occasionally mistaken for second-degree AV block. (medscape.com)
Khongphatthallayothin A, Chotivitayatarakorn P, Somchit S. Morbitz type I second degree AV block during recovery from dengue hemorrhagic fever. (medscape.com)
Second degree AV block implies that some predictable set of impulses fails to traverse the connection from atrium to ventricle while other impulses do. (medscape.com)
Electrocardiography (ECG) is employed to identify the presence and type of second-degree AV block. (medscape.com)
In second-degree AV block, some P waves conduct while others do not. (medscape.com)
A 14-day continuous ambulatory ECG monitor is placed and reveals the predominant rhythm as sinus with occasional PVCs, many runs of SVT, second-degree atrioventricular (AV) block type I, and second-degree AV block type II. (clinicaladvisor.com)
During the study, the presence of concealed His extrasystoles, which manifests as what appears to be a second-degree AV block type II, is observed (Figure 2). (clinicaladvisor.com)

A bundle branch block occurs in the fiber bundles of the conduction system in your ventricles. (msdmanuals.com)
No evidence of a bundle branch block is found. (clinicaladvisor.com)

Congenital atrioventricular block and pregnancy. (oalib.com)

Anatomy10

Organisms3

Diseases32

Chemicals and Drugs6

Analytical, Diagnostic and Therapeutic Techniques and Equipment23

Phenomena and Processes3

Disciplines and Occupations1

Technology, Industry, Agriculture1

Health Care4

Fetal ECG: a novel predictor of atrioventricular block in anti-Ro positive pregnancies. (1/265)

Tachycardia after pacemaker implantation in a patient with complete atrioventricular block. (2/265)

Randomized comparison of bipolar vs unipolar plus bipolar recordings during atrioventricular junction ablation: importance and efficacy of unipolar recording. (3/265)

Safety of and tolerance to adenosine infusion for myocardial perfusion single-photon emission computed tomography in a Japanese population. (4/265)

Sinus node function in children with congenital complete atrioventricular block. (5/265)

Acute and chronic effects of cardiac resynchronization in patients developing heart failure with long-term pacemaker therapy for acquired complete atrioventricular block. (6/265)

Transient atrioventricular block shortly after uneventful cryoablation of atrioventricular nodal re-entrant tachycardias: report of two cases. (7/265)

A randomized trial comparing two different approaches of pacemaker selection. (8/265)

Atrioventricular Block

Heart Block

Pacemaker, Artificial

Bradycardia

Electrocardiography

Bundle of His

Cardiac Pacing, Artificial

Atrioventricular Node

Heart Conduction System

Bundle-Branch Block

Magnetocardiography

Sick Sinus Syndrome

Torsades de Pointes

Adams-Stokes Syndrome

Rhododendron

Syncope

Tachycardia, Atrioventricular Nodal Reentry

Disopyramide

Arrhythmias, Cardiac

Catheter Ablation

Fetal Diseases

Hydrops Fetalis

Electrophysiologic Techniques, Cardiac

Anti-Arrhythmia Agents

Electrocardiography, Ambulatory

Nerium

Fetal Therapies

Cardiomyopathy, Restrictive

Arrhythmia, Sinus

Heart Rate

Inferior Wall Myocardial Infarction

Vectorcardiography

Long QT Syndrome

Heart Rate, Fetal

Tachycardia, Supraventricular

Myocarditis

Nerve Block

Sinoatrial Block

Treatment Outcome

Electrocoagulation

Dogs

Heart Septal Defects, Ventricular

Endocardial Fibroelastosis

Honey

Atrial Fibrillation

Septal Occluder Device

Echocardiography

Prenatal Diagnosis

Follow-Up Studies

Antibodies, Antinuclear

Cardiomyopathy, Hypertrophic

Atrial Flutter

Cardiac Catheterization

Heart Ventricles

Purkinje Fibers

Sinoatrial Node

Heart Atria

Tachycardia, Ventricular

Heart Septum

Tachycardia

Cardiomyopathies

Sotalol

NAV1.5 Voltage-Gated Sodium Channel

Radionuclide Ventriculography

Retrospective Studies

Wolff-Parkinson-White Syndrome

Heart

Cardiomyopathy, Dilated

Time Factors

Heart Defects, Congenital

Heart Valve Prosthesis Implantation

Sarcoidosis

Death, Sudden

Prospective Studies

Adenosine

Tilt-Table Test

Endocardium

Electrophysiology

Fetal ECG: a novel predictor of atrioventricular block in anti-Ro positive pregnancies. (1/265)

Tachycardia after pacemaker implantation in a patient with complete atrioventricular block. (2/265)