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)Vectorcardiography: 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.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.Ajmaline: An alkaloid found in the root of RAUWOLFIA SERPENTINA, among other plant sources. It is a class Ia antiarrhythmic agent that apparently acts by changing the shape and threshold of cardiac action potentials.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.Myocardial Infarction: NECROSIS of the MYOCARDIUM caused by an obstruction of the blood supply to the heart (CORONARY CIRCULATION).Coronary Stenosis: Narrowing or constriction of a coronary artery.Coronary Angiography: Radiography of the vascular system of the heart muscle after injection of a contrast medium.Troponin T: One of the three polypeptide chains that make up the TROPONIN complex. It is a cardiac-specific protein that binds to TROPOMYOSIN. It is released from damaged or injured heart muscle cells (MYOCYTES, CARDIAC). Defects in the gene encoding troponin T result in FAMILIAL HYPERTROPHIC CARDIOMYOPATHY.Angioplasty, Balloon, Coronary: Dilation of an occluded coronary artery (or arteries) by means of a balloon catheter to restore myocardial blood supply.Glasgow Outcome Scale: A scale that assesses the outcome of serious craniocerebral injuries, based on the level of regained social functioning.Cardiac Resynchronization Therapy: The restoration of the sequential order of contraction and relaxation of the HEART ATRIA and HEART VENTRICLES by atrio-biventricular pacing.Cardiac Pacing, Artificial: Regulation of the rate of contraction of the heart muscles by an artificial pacemaker.Heart Failure: A heterogeneous condition in which the heart is unable to pump out sufficient blood to meet the metabolic need of the body. Heart failure can be caused by structural defects, functional abnormalities (VENTRICULAR DYSFUNCTION), or a sudden overload beyond its capacity. Chronic heart failure is more common than acute heart failure which results from sudden insult to cardiac function, such as MYOCARDIAL INFARCTION.Cardiac Resynchronization Therapy Devices: Types of artificial pacemakers with implantable leads to be placed at multiple intracardial sites. They are used to treat various cardiac conduction disturbances which interfere with the timing of contraction of the ventricles. They may or may not include defibrillating electrodes (IMPLANTABLE DEFIBRILLATORS) as well.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).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.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.Congresses as Topic: Conferences, conventions or formal meetings usually attended by delegates representing a special field of interest.Societies, Medical: Societies whose membership is limited to physicians.Prince Edward Island: An island in the Gulf of St. Lawrence constituting a province of Canada in the eastern part of the country. It is very irregular in shape with many deep inlets. Its capital is Charlottetown. Discovered by the French in 1534 and originally named Ile Saint-Jean, it was renamed in 1799 in honor of Prince Edward, fourth son of George III and future father of Queen Victoria. (From Webster's New Geographical Dictionary, 1988, p981 & Room, Brewer's Dictionary of Names, 1992, p433)Education, Graduate: Studies beyond the bachelor's degree at an institution having graduate programs for the purpose of preparing for entrance into a specific field, and obtaining a higher degree.Cardiology: The study of the heart, its physiology, and its functions.Publishing: "The business or profession of the commercial production and issuance of literature" (Webster's 3d). It includes the publisher, publication processes, editing and editors. Production may be by conventional printing methods or by electronic publishing.JapanCardiac 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.Heart Rate: The number of times the HEART VENTRICLES contract per unit of time, usually per minute.Autonomic Nervous System: The ENTERIC NERVOUS SYSTEM; PARASYMPATHETIC NERVOUS SYSTEM; and SYMPATHETIC NERVOUS SYSTEM taken together. Generally speaking, the autonomic nervous system regulates the internal environment during both peaceful activity and physical or emotional stress. Autonomic activity is controlled and integrated by the CENTRAL NERVOUS SYSTEM, especially the HYPOTHALAMUS and the SOLITARY NUCLEUS, which receive information relayed from VISCERAL AFFERENTS.Death, Sudden, Cardiac: Unexpected rapid natural death due to cardiovascular collapse within one hour of initial symptoms. It is usually caused by the worsening of existing heart diseases. The sudden onset of symptoms, such as CHEST PAIN and CARDIAC ARRHYTHMIAS, particularly VENTRICULAR TACHYCARDIA, can lead to the loss of consciousness and cardiac arrest followed by biological death. (from Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine, 7th ed., 2005)Heart: The hollow, muscular organ that maintains the circulation of the blood.Magnetocardiography: 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.Clinical Medicine: The study and practice of medicine by direct examination of the patient.Magnetics: The study of MAGNETIC PHENOMENA.Magnetic Resonance Imaging: Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques.Fetal Diseases: Pathophysiological conditions of the FETUS in the UTERUS. Some fetal diseases may be treated with FETAL THERAPIES.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.Prenatal Diagnosis: Determination of the nature of a pathological condition or disease in the postimplantation EMBRYO; FETUS; or pregnant female before birth.Phantoms, Imaging: Devices or objects in various imaging techniques used to visualize or enhance visualization by simulating conditions encountered in the procedure. Phantoms are used very often in procedures employing or measuring x-irradiation or radioactive material to evaluate performance. Phantoms often have properties similar to human tissue. Water demonstrates absorbing properties similar to normal tissue, hence water-filled phantoms are used to map radiation levels. Phantoms are used also as teaching aids to simulate real conditions with x-ray or ultrasonic machines. (From Iturralde, Dictionary and Handbook of Nuclear Medicine and Clinical Imaging, 1990)Body Surface Area: The two dimensional measure of the outer layer of the body.Faculty, Medical: The teaching staff and members of the administrative staff having academic rank in a medical school.Faculty: The teaching staff and members of the administrative staff having academic rank in an educational institution.Private Practice: Practice of a health profession by an individual, offering services on a person-to-person basis, as opposed to group or partnership practice.Schools: Educational institutions.Faculty, Dental: The teaching staff and members of the administrative staff having academic rank in a dental school.Faculty, Nursing: The teaching staff and members of the administrative staff having academic rank in a nursing school.Curriculum: A course of study offered by an educational institution.Exhibits as Topic: Discussions, descriptions or catalogs of public displays or items representative of a given subject.Persons: Persons as individuals (e.g., ABORTION APPLICANTS) or as members of a group (e.g., HISPANIC AMERICANS). It is not used for members of the various professions (e.g., PHYSICIANS) or occupations (e.g., LIBRARIANS) for which OCCUPATIONAL GROUPS is available.International Cooperation: The interaction of persons or groups of persons representing various nations in the pursuit of a common goal or interest.Pharmacopoeias as Topic: Authoritative treatises on drugs and preparations, their description, formulation, analytic composition, physical constants, main chemical properties used in identification, standards for strength, purity, and dosage, chemical tests for determining identity and purity, etc. They are usually published under governmental jurisdiction (e.g., USP, the United States Pharmacopoeia; BP, British Pharmacopoeia; P. Helv., the Swiss Pharmacopoeia). They differ from FORMULARIES in that they are far more complete: formularies tend to be mere listings of formulas and prescriptions.New YorkUnited States Food and Drug Administration: An agency of the PUBLIC HEALTH SERVICE concerned with the overall planning, promoting, and administering of programs pertaining to maintaining standards of quality of foods, drugs, therapeutic devices, etc.

Clinical application of an integrated 3-phase mapping technique for localization of the site of origin of idiopathic ventricular tachycardia. (1/507)

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)

Ventricular excitation maps using tissue Doppler acceleration imaging: potential clinical application. (2/507)

OBJECTIVES: The purpose of this study is to validate the use of tissue Doppler acceleration imaging (TDAI) for evaluation of the onset of ventricular contraction in humans. BACKGROUND: Tissue Doppler acceleration imaging can display the distribution, direction and value of ventricular acceleration responses to myocardial contraction and electrical excitation. METHODS: Twenty normal volunteers underwent TDAI testing to determine the normal onset of ventricular acceleration. Two patients with paroxysmal supraventricular tachycardia and 30 patients with permanent pacemakers underwent introduction of esophageal and right ventricular pacing electrodes, respectively, and were studied to visualize the onset of pacer-induced ventricular acceleration. Eight patients with dual atrioventricular (AV) node and 20 patients with Wolff-Parkinson-White (WPW) syndrome underwent TDAI testing to localize the abnormal onset of ventricular acceleration, and the results were compared with those of intracardiac electrophysiology (ICEP) tests. RESULTS: The normal onset and the onset of dual AV node were localized at the upper interventricular septum (IVS) under the right coronary cusp within 25 ms before the beginning of the R wave in the electrocardiogram (ECG). In all patients in the pacing group, the location and timing of the onset conformed to the positions and timing of electrodes (100%). In patients with WPW syndrome, abnormal onset was localized to portions of the ventricular wall other than the upper IVS at the delta wave or within 25 ms after the delta wave in the ECG. The agreement was 90% (18 of 20) between the abnormal onset and the position of the accessory pathways determined by ICEP testing. CONCLUSIONS: These results suggest that TDAI is a useful noninvasive method that frequently is successful in visualizing the intramural site of origin of ventricular mechanical contraction.  (+info)

Dispersion of signal-averaged P wave duration on precordial body surface in patients with paroxysmal atrial fibrillation. (3/507)

AIMS: This study sought to investigate whether the spatial dispersion of signal-averaged P wave duration would be increased in patients with paroxysmal atrial fibrillation, by use of precordial mapping of the P wave signal-averaged ECG. METHODS AND RESULTS: The P wave signal-averaged ECG was recorded by the P wave-triggering method from 16 precordial leads in 55 patients with paroxysmal atrial fibrillation and 57 control subjects. As an index of the dispersion of signal-averaged P wave duration, we obtained the difference between the maximum and minimum in 16 recording sites. The dispersion was significantly greater in the patients with paroxysmal atrial fibrillation than the controls (26.6 +/- 9.5 vs 14.8 +/- 6.7 ms, P<0.0001). In 25 patients with symptomatic attacks of paroxysmal atrial fibrillation, the signal-averaged ECG was repeated 1 h after a single dose of orally administered pilsicainide, a new class Ic drug. These patients were prospectively followed-up for 10 +/- 11 months with pilsicainide. The rate of freedom from recurrence of paroxysmal atrial fibrillation attacks was significantly (P<0.0001) higher in patients with whom dispersion was decreased by the single dose (54%[7/13]) than in those in whom dispersion increased (8%[1/12]). CONCLUSION: Increased dispersion of signal-averaged P wave duration would play an important role in generating paroxysmal atrial fibrillation and would be useful in the prediction of drug efficacy to evaluate the change in dispersion by a single administration of pilsicainide.  (+info)

Mapping and ablation of ventricular tachycardia with the aid of a non-contact mapping system. (4/507)

OBJECTIVE: Treatment of ventricular tachycardia (VT) in coronary heart disease has to date been limited to palliative treatment with drugs or implantable defibrillators. The results of curative treatment with catheter ablation have proved disappointing because the complexity of the VT mechanism makes identification of the substrate using conventional mapping techniques difficult. The use of a mapping technology that may address some of these issues, and thus make possible a cure for VT with catheter ablation, is reported. PATIENTS AND INTERVENTION: The non-contact system, consisting of a multielectrode array catheter (MEA) and a computer mapping system, was used to map VT in 24 patients. Twenty two patients had structural heart disease, the remainder having "normal" left ventricles with either fasicular tachycardia or left ventricular ectopic tachycardia. RESULTS: Exit sites were demonstrated in 80 of 81 VT morphologies by the non-contact system, and complete VT circuits were traced in 17. In another 37 morphologies of VT 36 (30)% (mean (SD)) of the diastolic interval was identified. Thirty eight VT morphologies were ablated using 154 radiofrequency energy applications. Successful ablation was achieved by 77% of radiofrequency within diastolic activation identified by the non-contact system and was significantly more likely to ablate VT than radiofrequency at the VT exit, or remote from diastolic activation. Over a mean follow up of 1.5 years, 14 patients have had no recurrence of VT and only two target VTs have recurred. Five patients have had recurrence of either slower non-sustained, undocumented or fast non-target VT. Five patients have died, one from tamponade from a pre-existing temporary pacing wire, and four from causes unrelated to the procedure. CONCLUSION: The non-contact system can safely be used to map and ablate haemodynamically stable VT with low VT recurrence rates. It is yet to be established whether this system may be applied with equal success to patients with haemodynamically unstable VT.  (+info)

Low-frequency component of body surface potential maps identifies patients at risk for ventricular tachycardia. (5/507)

AIMS: To investigate the ability of spectral features of signal-averaged body-surface potential maps in identifying post-infarction patients who are at risk of developing ventricular tachycardia. METHODS AND RESULTS: We recorded 120 lead body surface potential maps during sinus rhythm in 135 subjects (45 patients with healed myocardial infarction but no history of ventricular tachycardia, 45 patients with both healed myocardial infarction and at least one episode of sustained ventricular tachycardia, and 45 normal subjects) and analysed spectral features of body surface potential maps selected on the basis of isoharmonic maps for given bands of the frequency spectrum. We found that in the low-frequency band (1-11 Hertz), the group-mean power spectra of leads located at isoharmonic map maxima were significantly different (P<0.0001) between the two groups of myocardial infarction patients. We estimated that this single feature alone can prospectively identify myocardial infarction patients at risk for ventricular tachycardia with a predictive accuracy of 74+/-6%. CONCLUSION: Our results suggest that the bulk of diagnostic information associated with arrhythmogenicity resides in the low-frequency band of the power spectrum. This finding is at variance with the established notion that only the high-frequency component of signal-averaged electrocardiograms carries such information.  (+info)

Signal averaged electrocardiography of Japanese. (6/507)

Although studies show that the ventricular tachycardia and sudden cardiac deaths caused by ischemic heart diseases affect Japanese less than Westerners, predictive accuracy of the signal averaged ECG for ventricular tachycardia and sudden cardiac deaths are almost the same as the results for Westerners. The recent prognosis of ischemic heart diseases is showing improvements along with the development of re-perfusion therapy, which is changing the significance of the signal averaged ECG. Therefore a clinical use for signal averaged ECG should be discussed in cases of cardiomyopathy which cause sudden cardiac deaths and other heart diseases. So it is necessary to redetermine normal values of the signal averaged ECG parameters. In this article, the following was reviewed on the basis of our studies regarding the clinical significance of the signal averaged ECG of Japanese and normal signal averaged ECG values. (1) System and gender specific differences on signal averaged ECG of Japanese, (2) His-Purkinje system, pre-P deflection and atrial late potential on signal averaged ECG, (3) Ventricular late potentials of Japanese.  (+info)

Use of electroanatomic mapping to delineate transseptal atrial conduction in humans. (7/507)

BACKGROUND: Interaction between wave fronts in the right and left atrium may be important for maintenance of atrial fibrillation, but little is known about electrophysiological properties and preferential routes of transseptal conduction. METHODS AND RESULTS: Eighteen patients (age 44+/-12 years) without structural heart disease underwent right atrial electroanatomic mapping during pacing from the distal coronary sinus (CS) or the posterior left atrium. During distal CS pacing, 9 patients demonstrated a single transseptal breakthrough near the CS os, 1 patient in the high right atrium near the presumed insertion of Bachmann's bundle and 1 patient near the fossa ovalis. The mean activation time from stimulus to CS os was 48+/-15 ms compared with 86+/-15 ms to Bachmann's bundle insertion (P<0.01) and 59+/-23 ms to the fossa ovalis (P=NS and P<0.01, respectively). During left atrial pacing, the earliest right atrial activation was near Bachmann's bundle in 5 and near the fossa ovalis in 4 patients. The activation time from stimulus to CS os was 70+/-15 ms compared with 47+/-16 ms to Bachmann's bundle (P<0.01) and 59+/-25 ms to the fossa ovalis (P=NS). Whereas the total septal activation time was not significantly different during CS pacing compared with left atrial pacing (41+/-16 versus 33+/-17 ms), the total right atrial activation time was longer during CS pacing (117+/-49 versus 79+/-15 ms; P<0.05). CONCLUSIONS: Three distinct sites of early right atrial activation may be demonstrated during left atrial pacing. These sites are in accord with anatomic muscle bundles and may have relevance for maintenance of atrial flutter or fibrillation.  (+info)

Computer-assisted animation of atrial tachyarrhythmias recorded with a 64-electrode basket catheter. (8/507)

OBJECTIVES: The aim of this study was to assess the value of a new mapping technique based on computer-assisted animation of multielectrode basket catheter (BC) recordings in patients with atrial arrhythmias. BACKGROUND: The three-dimensional activation patterns of cardiac arrhythmias are not completely understood owing to limitations of conventional mapping techniques. METHODS: The study included 32 patients with atrial tachycardia (AT) and 38 patients with atrial flutter (AFL). A software program was developed to analyze the activation patterns based on 56 bipolar electrograms recorded with a 64-electrode BC deployed in the right atrium (RA). RESULTS: The total time needed for the animation of activation patterns of atrial arrhythmias was 5 +/- 0.8 min. In 22 patients with right AT, the animated maps revealed that arrhythmia was unifocal in 15 patients, multifocal in 2 patients, polymorphic in 4 patients and reentrant in 1 patient. In 10 patients with left AT, breakthroughs on the right side of the septum (2 in 8 patients and 1 in 2 patients) and a left-to-right activation of the RA were demonstrated. In patients with typical AF, the reentrant excitation was a broad activation front with preferential propagation around the tricuspid annulus. In patients with atypical AFL, the reentry circuit involved one of the venae cavae and a line of block located in the posterior wall. CONCLUSIONS: The computer-assisted animation of multiple electrograms recorded with a BC is a valuable mapping tool that delineates the three-dimensional activation patterns of various atrial arrhythmias. The technique is appropriate for complex, short-lived or unstable arrhythmias.  (+info)

METHODS AND RESULTS The present study compares 120-lead body surface potential map (BSPM) data from 131 patients with acute MI and 159 normal control subjects (N). The MI population was stratified according to the location of ventricular wall motion abnormalities evidenced by radionuclide imaging into 76 patients with anterior MI (AMI), 32 patients with inferior MI (IMI), and 23 patients with posterior MI (PMI). BSPM were recorded within 24 hours of admission. Group mean BSPM of the ST segment were obtained for N, AMI, IMI, and PMI by sampling the time-normalized ST-T waveform at 18 equal intervals and averaging the voltages at each electrode site over the first five of these 18 ST-T time instants. Corresponding discriminant maps were also computed for each pairwise comparison (AMI versus N, IMI versus N, and PMI versus N) by subtracting the normal group mean voltages from each MI group mean voltages and by further dividing each resulting difference by the composite standard deviation calculated ...
Non-invasive diagnosis of acute myocardial infarction (AMI) associated with significant left main coronary artery stenosis (LMCAS) is challenging, with characteristic 12-lead ECG abnormalities of ST elevation (STE) in lead aVR, precordial T wave inversion (TWI) and/or ST depression (STD) having low diagnostic sensitivity. Methods Consecutive patients presenting to our unit with acute ischaemic-type chest pain from 2000-10 were analyzed. Entry criteria: 12-lead ECG and BSPM at presentation, cardiac troponin T (cTnT) ≤ 12h and coronary angiography during admission. Peak cTnT ≥0.03µg/L defined AMI. ECG abnormalities assessed: STEMI by Minnesota criteria; STE in lead aVR ≥0.5mm; STD ≥0.5mm in ≥2 contiguous leads (CL); TWI ≥1mm in ≥2CL. BSPM STE was: ≥2mm in anterior; ≥1mm in lateral, inferior, right ventricular (RV) or high right anterior (HRA); and ≥0.5mm in posterior territories. Angiographic luminal narrowing ≥70% defined significant LMCAS. Results Enrolled were 2810 ...
Adolescent; Adult; Arrhythmias, Cardiac; Body Surface Potential Mapping; Catheter Ablation; Child; Child, Preschool; District of Columbia; Female; Fluoroscopy; Humans; Infant; Infant, Newborn; Male; Prevalence; Radiation Dosage; Radiation Exposure; Radiation Protection; Retrospective Studies; Risk Factors; Surgery, Computer-Assisted; Treatment Outcome; Young Adult. ...
Ischemic heart disease is the single most frequent cause of death in. the world today. Electrocardiogram (ECG) exercise testing is a common. tool for diagnosing this disease. With the ECG exercise test one can. compare the recording of the electrical activity in the heart during. exercise and rest. A shift between the rest and exercise recording in. the segment of the heartbeat called the ST segment is used both for. diagnosing ischemia, and as input to cardiac computation methods.. Body surface potential mappings (BSPM) are ECG recordings at a greater. number of locations on the torso, and provides better detection and. localisation properties than the traditional 12-lead ECG. In BSPM and ECG,. noise and drift from various sources are recorded in addition to the. signal propagating from the heart. A model for this is:. BSPM=signal+noise+drift.. Before accurate measurements of the ST segments in a BSPM. can be made, the noise and drift in the recording must be reduced. while keeping the signal ...
Quantitatively mapping surface properties with nanometer or even subnanometer resolutions is critical for advanced scanning probe microscopy (SPM) characterization. However, the characterization performance often suffers from noises and artifacts due to instrumentation or environmental limitations. In this p
Objectives. This study examined the performance of the 62-lead body surface electrocardiogram (ECG) in identifying the site of origin of ventricular tachycardia in patients with a previous myocardial infarction.. Background. Because the accuracy of ECG localization of ventricular tachycardia using standard 12-lead recordings is restricted to the identification of rather large ventricular areas, application of multiple torso lead recordings may augment the resolving power of the surface ECG and result in more discrete localization of arrhythmogenic foci.. Methods. Thirty-two patients were selected for electrophysiologically guided ablative therapy for drug-resistant postinfarction ventricular tachycardia. In these patients, QRS integral maps of distinct monomorphic ventricular tachycardia configurations were correlated with a previously generated infarct-specific reference data base of paced QRS integral maps. Each paced pattern in the data base corresponded with ectopic endocardial impulse ...
The non-invasive localization of focal heart activity via body surface potential measurements (BSPM) could greatly benefit the understanding and treatment of arrhythmic heart diseases. However, the in vivo validation of source localization algorithms
BACKGROUND AND PURPOSE: Understanding drug effects on the heart is key to safety pharmacology assessment and anti-arrhythmic therapy development. Here our goal is to demonstrate the ability of computational models to simulate the effect of drug action on the electrical activity of the heart, at the level of the ion-channel, cell, heart and ECG body surface potential. EXPERIMENTAL APPROACH: We use the state-of-the-art mathematical models governing the electrical activity of the heart. A drug model is introduced using an ion channel conductance block for the hERG and fast sodium channels, depending on the IC(50) value and the drug dose. We simulate the ECG measurements at the body surface and compare biomarkers under different drug actions. KEY RESULTS: Introducing a 50% hERG-channel current block results in 8% prolongation of the APD(90) and 6% QT interval prolongation, hERG block does not affect the QRS interval. Introducing 50% fast sodium current block prolongs the QRS and the QT intervals by 12% and
To evaluate the source of ST depression, a sheep model of subendocardial ischaemia using partial coronary artery ligation coupled with atrial pacing was developed. Ischaemia was induced initially in either the left anterior descending coronary artery or the left circumflex coronary artery territory and subsequently in the territory of the other vessel. The ischaemic regions were documented by a fluorescent microsphere technique. During ischaemia potentials were mapped simultaneously from the endocardium and the epicardium. The distributions of epicardial potentials from either ischaemic source were very similar (0.77±0.14, P,0.0001), both showing ST depression on the free wall of the left ventricle, and no association between the ST depression and the ischaemic region. At the same time, the endocardial ST elevation was directly associated with the region of reduced blood flow. Insulating the heart from the surrounding tissue with plastic increased the magnitude of epicardial and endocardial ST ...
Optical potential energy landscapes created using acousto-optical deflectors are characterized via solvent-driven colloidal particles. The full potential energy of both single optical traps and complex landscapes composed of multiple overlapping traps are determined using a simple force balance argument. The potential of a single trap is shown to be well described by a Gaussian trap with stiffness found to be consistent with those obtained by a thermal equilibrium method. We also obtain directly the depth of the well, which (as with stiffness) varies with laser power. Finally, various complex systems ranging from double-well potentials to random landscapes are generated from individually controlled optical traps. Predictions of these landscapes as a sum of single Gaussian wells are shown to be a good description of experimental results, offering the potential for fully controlled design of optical landscapes, constructed from single optical traps.. © 2012 Optical Society of America. Full ...
One of the problems with applying these data clinically might be the extra-invasive procedure (insertion of the non-contact balloon to the left ventricle) and the subsequent time and cost. Theoretically it would be very useful to perform non-contact mapping during the implant procedure in order to identify the area of latest activation not obstructed by conduction block and scar. This would also allow the operator to pass the catheter locator signal produced by the non-contact mapping system through the left ventricular lead and therefore steer it to that site. However, at the present time it is recommended that the patient is heavily anticoagulated while the non-contact balloon is in the left heart which would prevent safe implantation of the CRT system.. Fung and colleagues14 have gone some way to try and overcome this problem by comparing non-contact mapping data to tissue Doppler imaging. They found that latest activation on non-contact and tissue Doppler correlated well. They did not ...
A surface mapping electrode set assembly is provided which includes a plurality of insulated, elongated wires, each of which terminates at a distal end head portion of the assembly. The electrodes of
Pyloric motor neurons synapse at multiple sites along pyloric muscle fibers (Atwood et al., 1977, 1978; Atwood and Wojtowicz, 1986).A priori, two explanations for the EJP amplitude variability reported here thus exist. One is that the muscle fibers are essentially isopotential (fiber length less than two length constants) and the variability arises from variability in vesicle number released at each synaptic site during each spike. Given the large number of synaptic sites and large variation in quantal number observed at some crustacean synapses (Atwood and Wojtowicz, 1986), this variation would give rise to the smooth variation in EJP amplitude we observe. However, the short λ measured with multiple penetrations contradicts this explanation, because these data imply that the muscle fiber is not isopotential, and hence different synaptic sites are electrically isolated from each other. Pyloric muscle diameter is such that relatively small changes in membrane resistance would induce large length ...
We present a new image integration technique for flash and long-exposure image pairs to capture a dark scene without incurring blurring or noisy artifacts. Most existing methods require well-aligned images for the integration, which is often a burdensome restriction for practical use. We address this issue by locally transferring the colors of the flash images using a small fraction of corresponding pixels in the long-exposure images. We formulate image integration as a convex optimization problem with the local linear model. The proposed method makes it possible to integrate the color of the long-exposure image with the detail of the flash image without causing any harmful effects to its contrast, where the images do not need perfect alignment by virtue of our new integration principle. We show our method successfully outperforms the state-of-the-art in image integration and reference based color transfer for challenging misaligned datasets. ...
An implantable lead body, and method of manufacturing same, and system for stimulation. The lead body includes an expanding/expansion section providing an additional length or slack in the lead body and allowing the lead body to expand or stretch with the body thereby reducing or eliminating the mechanical force or strain on the ends of the lead at the destination sites.
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Air temperature: -2.2°C. In the late evening, the ship left iceberg C-18A and traveled east in search of an area away from the influence of icebergs. The principal investigators monitored the ships data systems during the transit to select the study area. When the ship reached a suitable location about 75 kilometers away, a suite of sampling began to characterize the area. First, the MOCNESS net system was deployed for several hours and recovered before sunrise. While the MOCNESS crew sorted samples in the lab, other research teams conducted water collections with trace-metal-clean Niskin bottles, surface mapping, and CTD casts throughout the day. Just after dinner, a Langrangian sediment trap was lowered into the water and started on a three-day drift at 600 meters depth. After completing the last set of surface mapping measurements late tonight, the ship will transit south back toward a zone rich with small icebergs for the next study area.. Bottles and bottles of seawater samples were ...
A lead assembly adapted for endocardial fixation to a human heart is provided. The lead assembly includes a lead body that has a proximal end provided with a connector for electrical connection to a cardiac stimulator. The cardiac stimulator may be a pacemaker, a cardioverter/defibrillator, or a sensing instrument. The distal end of the lead body is connected to a tubular electrode housing. The lead body consists of a noncoiled conductor cable surrounded by a coextensive insulating sleeve. In contrast to conventional leads, the lead body of the present invention does not require coiled conductor wires or an internal lumen. Manipulation of the lead body is via an external guide tube. Lead body diameters of 0.25 mm or smaller are possible.
Surface mapping plays an important role in geometric processing, which induces both area and angular distortions. If the angular distortion is bounded, the mapping is called a quasiconformal mapping (
Gene therapy to repair damaged heart muscle is most likely to succeed if it can be injected at the site of ischemia where there is viable myocardium with reduced contractile ability, and a new technique that combines imaging and electroanatomical mapping does just that. A study of this novel approach that shows increased blood flow in treated areas in patients with refractory angina is published in Human Gene Therapy.
A lead includes a lead body extending from a proximal end to a distal end and having an intermediate portion. A shocking electrode is disposed proximate the distal end of the lead body, and a pacing electrode is disposed along the intermediate portion of the lead body. The distal end of the lead body includes a preformed biased shape.
Start at 2018-01-19 12:35:36 First, load the ontology MsigdbC2KEGG and its gene associations in the genome Hs (2018-01-19 12:35:36) ... org.Hs.eg (from https://github.com/hfang-bristol/RDataCentre/blob/master/dnet/1.0.7/org.Hs.eg.RData?raw=true) has been loaded into the working environment (at 2018-01-19 12:35:37) org.Hs.egMsigdbC2KEGG (from https://github.com/hfang-bristol/RDataCentre/blob/master/dnet/1.0.7/org.Hs.egMsigdbC2KEGG.RData?raw=true) has been loaded into the working environment (at 2018-01-19 12:35:39) Then, do mapping based on symbol (2018-01-19 12:35:39) ... Among 19420 symbols of input data, there are 19038 mappable via official gene symbols but 382 left unmappable Third, perform GSEA analysis based on 1000 permutations for 186 gene sets (2018-01-19 12:35:43) ... Sample 1 is being processed at (2018-01-19 12:35:43) ... 10 of 186 gene sets have been processed (2018-01-19 12:35:45) ... 20 of 186 gene sets have been processed (2018-01-19 12:35:48) ... 30 of 186 gene sets have ...
Service Mapping can perform discovery based on data collected using the Netflow protocol. Netflow is a protocol that Service Mapping can use to collect data about CIs and their connections along with Netstat and lsof commands. Using the Netflow protocol
不動産担保ローンは無担保のローンに比べ金利が安い - 所有している不動産を担保にして借り入れをする不動産担保ローンは 無担保のローンに比べると 不動産の価値にもよりますが 金利が安く 融資額が大きい 長期の借り入れが可能などのメリットがあります》 融資額の内容は所有している […] ...
Pseudoaneurysm of thoracic aorta as a complication of blunt trauma to the chest, can present with a variety of symptoms due to mass compression effect. Here we report the first pseudoaneurysm of thoracic aorta presenting with chronic cough and inappropriate sinus tachycardia. The purpose of this case report is to highlight pseudoaneurysm of thoracic aorta as a rare differential diagnosis for inappropriate sinus tachycardia. Here we report a case of 29-year-old white woman, a nurse, with history of a motor vehicle accident. She initially presented to medical attention with inappropriate sinus tachycardia 2 years following the motor vehicle accident during her pregnancy. Six years later she underwent sinoatrial node modification after failing a number of medications. Days prior to the ablation she developed a mild cough which became constant within a week following ablation. A computed tomography scan of her chest performed as part of a workup revealed an outpouching of the inferomedial aspect of the
Optical tweezers (OT) are widely used for pico (and femto)-Newton range force measurements. The appropriate choice of the bead size is not well understood for biopolymer stretching applications of OT. We have shown, both by theory and experiment, that wrong choice of the bead size could cause errors as large as 295% in the measured force. We provide a simple map for correct choice of the bead size and the direction of pulling for such applications. There is a good agreement between our theoretical and experimental results.. © 2013 Optical Society of America. Full Article , PDF Article ...
Inappropriate sinus tachycardia (IST) is a non-paroxysmal arrhythmia, characterized by a persistently high sinus heart rate (HR) and/or an exaggerated HR response to minimal exertion, and can be responsible for palpitations, asthenia, chest pain, dizziness and syncope, which can be highly invalidating. Conventional treatment of IST, targeted to symptoms control, mainly consists on β-blockers. However, these drugs are often insufficient or not well tolerated because of side effects (mostly hypotension) that usually limit the administered dose. Ivabradine, a sinus rate lowering agent currently employed in Europe in the treatment of stable angina and chronic heart failure, has recently been demonstrated to be effective and safe in the treatment of IST by a few case reports and clinical trials. A randomized clinical trial comparing ivabradine to β-blockers has not be performed yet ...
Can inappropriate sinus tachycardia be brought on by having severe gastroparesis and chronic fatigue? I was just diagnose with IST and doc thinks it was brought on by my severe illness and he said that...
0154] FIG. 20 is an illustration of an exemplary application of functional imaging and non-invasive electrical potential mapping according to a method of the present invention. As will be appreciated, the system and methodology of the present invention allow for both functional imaging of biological objects 19 and mapping of electrical excitation within biological tissues 19. This may be achieved as a two-step imaging process, as illustrated in FIG. 20. First, the system 100 is used as an electromagnetic tomographic imaging tool for non-invasive assessment of functional and pathological conditions of a biological object 19 and the location of any areas of diseased tissues 19. For example, in FIG. 20, cardiac tissue with suspicious areas of myocardium is functionally imaged in Step 1 to identify areas of ischemia/infarction. Second, if the location of a diseased target is within a biologically excited tissue 19 (such as cardiac tissue, nervous tissue, musculoskeletal tissue, or the like), then a ...
The techniques of theoretical chemistry have been used to elucidate the molecular properties and modes of receptor binding that modulate receptor affinity and antagonist activity of the beta-carbolines, a class of potent benzodiazepine antagonists. Six analogs were chosen in order to investigate the role of the amine (NH) group, the aromatic nitrogen, and the C3-substituent in determining receptor affinities. Electrostatic potential mapping and characterization of explicit drug-receptor interactions have led to the hypothesis that simultaneous interaction of a model cationic arginine site with the N2 and C3-substituents could play a key role in determining receptor affinities. The electron-withdrawing effects of C3-substituents on the amine nitrogen appear less important, though interactions of these groups with an anionic glutamate or aspartate site could also occur at the receptor. Similarly, stacking interactions with neutral or cationic aromatic residues such as tryptophan or protonated ...
Since I was 18, I have noticed times when my heart seems to stall out for a second or so, then catch up by beating really rapidly for a few beats before evening itself out. Since these occure...
Hi everyone. I am new to this group and was really hoping that someone might have some insight for me. Im a 23 year old female and have been diagnosed with IST...
The mechanism of post-infarct SMVT is scar-related re-entry in the majority of patients (1). Inhomogeneous scarring with varying degrees of subendocardial myocardial fiber preservation within dense zones of fibrosis leads to slowed conduction, nonuniform anisotropy, and the potential for channels within the scar zone-conditions necessary for the development of re-entry (2,3). In the ablation era, high-density electroanatomic mapping has been used to characterize the electrical correlates of this well-described pathologic substrate, allowing for development of substrate modification strategies (7) to target unmappable SMVTs (19). Channels within a scar (isolated potentials [6,11], very late potentials) or regions at the scar-border zone (putative exit sites) (18,20) appear to represent critical components of the re-entrant circuit and have all been targeted with successful long-term ablation outcomes.. The current study compares these key markers of SMVT substrate by creating high-density maps of ...
A medical lead which has a connector assembly coupled to an electrode by a lead body, the lead body is designed so as to have greater resistance to crush fatigue in the area which is located between the rib and clavicle when implanted. In particular the lead body of the present invention features an insulative sheath covering a coiled conductor. The coiled conductor has three sections, viz., proximal, intermediate and distal sections. The intermediate section has a different pitch as compared to proximal section and distal section. In the preferred embodiment, intermediate section has a pitch of approximately 0.100 while proximal section has a pitch of approximately 0.025 and distal section has a pitch of approximately 0.025. Moreover, intermediate section has a length of approximately 10.4 inches while proximal section has a length of approximately 5.1 inches and distal section has a length of approximately 7.2 inches. In such a manner the lead of the present invention presents a coiled conductor
An assembly is provided for an implantable medical lead. The assembly includes a first lead body comprising one or more electrical leads, and a hermetic encasement. The encasement comprises a housing having first and second openings and interior walls, an interior space defined by the interior walls, an electronic network housed within the interior space, and a circuit board extending through the first and second openings. The circuit board comprises a plurality of layers into which the electronic network is at least partially integrated, a first set of one or more terminals electrically coupling the electronic network to the first lead body, and a second set of one or more terminals electrically coupled to the electronic network for external electrical engagement.
Hi everyone. I havent posted in a very long time, but I experienced HELLP with my pregnancy back in November of 2010. Since then there have been several tests for autoimmune disorders and other things, all which have come back normal. However, I have had fairly frequent heart palpitations since the birth of my son. I actually got them prior to my pregnancy, but they would be very rare...now they occur more frequently. After wearing a heart monitor, it looks like I am basically experiencing inappropriate sinus tachycardia. This isnt a very serious thing from what I gather, but I am on a low dose beta-blocker to help with the symptoms ...
Assessment of myocardial fibrosis by endoventricular electromechanical mapping in experimental nonischemic cardiomyopathy.. International Journal of Cardiovascular Imaging International Journal of Cardiac Imaging. 27:25-37. 2011 ...
A lead includes a lead body extending from a proximal end to a distal end and having an intermediate portion. A shocking electrode is disposed proximate the distal end of the lead body, and a pacing electrode is disposed along the intermediate portion of the lead body. The distal end of the lead body includes a pre-formed biased shape.
To demonstrate this potential, clusters of contracting cardiomyocytes isolated from the differentiation cultures were transplanted into the left ventricle of pigs that had their atrioventricular node ablated. The recipient hearts had spontaneous rhythms that appeared to originate from the transplanted cells as assessed by high-resolution electroanatomical mapping. Though promising, these results also raise the concern that transplanted cells could serve as a nidus for arrhythmia. Other mesoderm-derived lineages. While the hematopoietic, vascular, and cardiac lineages have been studied in most detail, the ES cell system does offer the potential to develop many other mesoderm lineages. To date, cell populations representing the skeletal muscle (Rohwedel et al. 1994 ...
The Seal of Danthazars about to open for-real cross-my-heart this time, so stand back. The seal - basically a manhole with modified Sigil of Baphomet and some vaguely Celtic knots - isnt literally over the Hellmouth. The Hellmouth is a colorful term for the focal point of mystical energies. In other circumstances, that might read as fantasy gobbledy-gook to smear over any number of sins in plotting mechanics. Lately, down at the convergence point in the basement, the floor plan has become unmappable, shifting, nonlinear. Tricky. And the Hellmouth is nowhere, but does seem to end up manifesting as a hole in the dirt which belches forth unclean things. And the Hellmouth is everywhere, but seems to draw all dramatic focus to the sepulchral caverns under a school. This spot seems to want to be a school or need to be a school. If you burn it down, the Hellmouth pushes a new one up through the rubble. If you switch campuses to UC Sunnydale, youll find the Hellmouths manmade twin malfunctioning ...
The Seal of Danthazars about to open for-real cross-my-heart this time, so stand back. The seal - basically a manhole with modified Sigil of Baphomet and some vaguely Celtic knots - isnt literally over the Hellmouth. The Hellmouth is a colorful term for the focal point of mystical energies. In other circumstances, that might read as fantasy gobbledy-gook to smear over any number of sins in plotting mechanics. Lately, down at the convergence point in the basement, the floor plan has become unmappable, shifting, nonlinear. Tricky. And the Hellmouth is nowhere, but does seem to end up manifesting as a hole in the dirt which belches forth unclean things. And the Hellmouth is everywhere, but seems to draw all dramatic focus to the sepulchral caverns under a school. This spot seems to want to be a school or need to be a school. If you burn it down, the Hellmouth pushes a new one up through the rubble. If you switch campuses to UC Sunnydale, youll find the Hellmouths manmade twin malfunctioning ...
A lead includes a lead body extending from a distal end to a proximal end, and at least one conductor disposed within the lead body and extending from the distal end to the proximal end of the lead body. The lead further includes an outer terminal ring, a terminal pin, and an insulative sleeve disposed between the outer terminal ring and the terminal pin, where the insulative sleeve is coupled with the outer terminal ring with a snap-fit connection. A pin latch is disposed on an outer periphery surface of the insulative sleeve, where the pin latch is rotatable about a hinge point.
Having received the European CE Mark for its Rhythmia Mapping System just last May, Boston Scientific just won FDA clearance for the cardiac mapping and
Cardiac mapping is a technique in which the information from cardiac electrograms is gathered and displayed. Cardiac mapping is used to diagnose the heart
Technological singularity around the corner? » Forum Post by Timmaigh » Is this actually for real? I mean do they really h
This meta-analysis is limited by the studies included in the analysis. All of the studies were observational studies, and therefore they are susceptible to selection bias. There were significant differences in the patients included and the strategy used when performing VT ablations. Although the overall strategy was to target all inducible VTs, only 1 study indicated ablation of all clinically relevant VTs as a predetermined end point.23 Table II in the Data Supplement indicates the specific protocols and catheters used in the analyzed studies.. Another important limitation is the definition of the clinical VT. The definition used in the selected studies is not uniform and is not based on the 12-lead ECG in all studies. Because 12-lead ECGs are not available for all patients, VT electrogram morphology from implantable cardioverter defibrillators can be used instead with similar accuracy and have been found to be helpful in identifying the clinical VT.5 This definition was used by only one, but ...
Electrostatic potential maps (EPMs) allow for representation of key molecular-level information in a relatively simple and inexpensive format. As these visualizations become more prevalent in instruction, it is important to determine how students are exposed to them and supported in their use. A systematic review of current general and organic chemistry textbooks (N = 45) determined how frequently EPMs were presented in texts, how well distributed EPMs were across chapters, whether EPMs were included in end-of-chapter problems, and the types of conceptual instructional support provided to students when first exposed to them. Analysis demonstrated great variance in the use of EPMs. Most, but not all, textbooks presented at least one image, yet the prevalence and integration across texts varied greatly, owing in part to content differences between general and organic texts. Many texts provided minimal conceptual support and did not include EPMs in end-of-chapter problem sets. Overall,
Cardiac magnetic resonance imaging (MRI) is a highly accurate non-invasive method for assessing myocardial scar by delayed enhancement imaging. Attempts to correlate electrogram voltage characteristics obtained by catheter-based point mapping to scar detected by MRI suggest that conventional substrate mapping techniques have limitations that could hinder ablative efficacy. This chapter discusses the role of cardiac MRI in the substrate-based ablation of unstable, reentrant ventricular tachycardias prior to ablation, during ablation and after ablation. Prior to ablation, the presence of delayed enhancement and its patterns can provide clues about the potential for reentrant circuits and regions where substrate may be present. During ablation, the integration of MRI-based scar maps with voltage-based scar maps within electroanatomical mapping systems has an emerging role, and may help identify residual channels of conduction embedded within regions of heterogeneous scar. After ablation, ...
Methods and Results Nineteen patients with CC undergoing detailed epicardial and endocardial LV tachycardia mapping and ablation were included. A total of 8494 epicardial and 6331 endocardial voltage signals and 314 epicardial/endocardial matched pairs of points were analyzed. Basal lateral LV scar involvement was observed in 18 of 19 patients. Bipolar voltage mapping demonstrated larger epicardial than endocardial scar and core-dense (≤0.5 mV) scar areas (28 [20-36] versus 19 [15-26] and 21 [2-49] versus 4 [0-7] cm2; P=0.049 and P=0.004, respectively). Bipolar epicardial and endocardial voltages within scar were low (0.4 [0.2-0.55] and 0.54 [0.33-0.87] mV, respectively) and confluent, indicating a dense/transmural scarring process in CC. The endocardial unipolar voltage value (with a newly proposed ≤4-mV cutoff) predicted the presence and extent of epicardial bipolar scar (P,0.001). ...
St. Jude Medical (NYSE:STJ) said today it fully launched its EnSite Precision cardiac mapping system and associated tools in Europe, expanding from an earlier limited release.. The St. Paul, Minn.-based company touted more than 100 installations of the device across Europe so far, supporting more than 5,000 ablation procedures after a targeted release it expanded in April.. "We collaborated with leading electrophysiologists to develop a cardiac mapping system that provides the automation, flexibility and precision needed during todays ablation procedures. We are extremely pleased with how the physicians from these European sites have embraced the system and are excited to expand its availability as we seek more approvals," chief medical officer Dr. Mark Carlson said in a press release.. The Ensite cardiac mapping system is designed for use in ablation procedures to visualize and aid in catheter navigation in the heart, providing detailed anatomical models and maps, St. Jude said. The system is ...
A lead body includes an electrode coupled to an intermediate portion of the lead body. A distal end of the lead includes a pre-formed, biased shape adapted to passively fixate the distal end of the lead within a pulmonary artery with the electrode positioned in the right ventricle or ventricular outflow tract. The lead body can include a preformed J-shape, with the electrode coupled to the intermediate portion of the lead body and located distally from a bottom of the pre-formed J-shape. The lead body can include a section of the intermediate portion of the lead body being less stiff than adjacent sections of the lead body with the electrode coupled to the intermediate portion of the lead body and located distally from the less stiff section.
Heart Failure clinical trial. Clinical trial for Electrical Activation Mapping Guided Tailor Made Approach for Cardiac Resynchronization Therapy.
Inappropriate Sinus Tachycardia (IST) is a condition in which an individuals resting heart rate is abnormally high - greater than 100 beats per minute or rapidly accelerating to over 100 beats per minute without an identifiable cause; although small amounts of exercise, emotional or physical stress are triggering factors. An electrocardiogram (ECG) does not show any abnormalities as IST arises within the sinus node where the normal heart rhythm is generated. It is a relatively new disorder. Individuals with this condition can find themselves increasingly disabled and experiencing high levels of anxiety. IST is not a life threatening condition but it can be very debilitating. Where sinus tachycardia is identified it is important to rule out other treatable conditions before making the diagnosis of IST - it may be that there is a curable cause. ...
The BY4741 strain used in (Nagalakshmi et al. 2008) was used in this study. RNA-Seq was performed using the protocol developed in (Nagalakshmi et al. 2008), further described in (Nagalakshmi et al. 2010) and (Waern et al. 2011), and using the modifications developed by (Parkhomchuk et al. 2009) to generate strand-specific reads.. Analysis was performed on custom software developed in-house using BowTie (Langmead et al. 2009) to map reads to the S288C reference genome available on SGD, downloaded on May 17, 2010. Python, NumPy, SciPy, and matplotlib were used to further process the data. The softwares source code is available (Saccharomyces Genome Database). Of note, to maximize the information gleaned, unmappable reads were trimmed by four bases from the 3′ end and remapping was attempted; this was done iteratively until only 28 bp remained, at which point the read was considered unmappable. This end trimming typically doubled or more the number of mappable reads.. Expression levels were ...
But I dont understand why youd want to do this anyway. The whole point of having a dendrite is to introduce membrane that is not isopotential with the spike trigger zone. It has been a decade at least since it was demonstrated that somatic spikes do not suck all synaptic charge out of the dendrites of real cells or reset membrane potential to ek or resting level (sorry, I dont recall the authors but I think that was published in Science). And years before that it was known that backpropagating spikes spread decrementally into dendrites, often dying out over relatively short distances. So why reset the whole dendrite after a somatic spike ...
A complete table of all Phase II drill intercepts can be found on the Company website here.. Importantly, the Companys ongoing drill program continues to define new zones of near surface, high-grade, oxide gold mineralization as highlighted by the new K and N-Zone discoveries. Following up on work conducted earlier this year in the area of the northwest oriented M-Zone, Newrange previously announced the discovery of a high-grade northwest oriented gold zone now referred to as the Jack Zone (J-Zone) to the southwest of the M-Zone. The latest results have expanded the width and provided more geologic detail on the nature and extent of the J-Zone gold mineralization.. Overall, the Companys drilling in the Merritt Discovery area confirms surface mapping and sampling results that define a northwest dominant structural control over a stockwork-like array of high, moderate and low angle structures within a highly variable, and therefore highly receptive and extensive sequence of volcanic host ...
Singularity University, Singularity Hub, Singularity Summit, SU Labs, Singularity Labs, Exponential Medicine, Exponential Finance and all associated logos and design elements are trademarks and/or service marks of Singularity Education Group.. © 2018 Singularity Education Group. All Rights Reserved.. Singularity University is not a degree granting institution.. ...
Singularity University, Singularity Hub, Singularity Summit, SU Labs, Singularity Labs, Exponential Medicine, Exponential Finance and all associated logos and design elements are trademarks and/or service marks of Singularity Education Group.. © 2020 Singularity Education Group. All Rights Reserved.. Singularity University is not a degree granting institution.. ...
Effect of electrical activation site on left ventricular performance in ventricular tachycardia patients with coronary heart disease.: Some patients with ventri
Advances in languages, compilers, and tools open the possibility of significantly improving software. For example, Singularity uses type-safe languages and an abstract instruction set to enable what we call Software Isolated Processes (SIPs). SIPs provide the strong isolation guarantees of OS processes (isolated object space, separate GCs, separate runtimes) without the overhead of hardware-enforced protection domains. In the current Singularity prototype SIPs are extremely cheap; they run in ring 0 in the kernels address space.. Singularity uses these advances to build more reliable systems and applications. For example, because SIPs are so cheap to create and enforce, Singularity runs each program, device driver, or system extension in its own SIP. SIPs are not allowed to share memory or modify their own code. As a result, we can make strong reliability guarantees about the code running in a SIP. We can verify much broader properties about a SIP at compile or install time than can be done for ...
Question - Want help interpreting ECG. Do I need to be concerned with QRS low voltage?. Ask a Doctor about Sinus rhythm, Ask a Cardiologist
This paper discusses the critical stress test and the breakdown voltage at low voltage cable NYFGbY with 3x25 mm size. By knowing the type and function of the use of cable wires can be maximized and used for purposes such as the channels of power, especially power lines underground. The data of test results can be known ability of the cable so as not to exceed the actual ability compared with the value of ID, so that the useful life and the characteristics of the cable can be known. From the test results that have been performed on the cable fails the test voltage SPLN 43-2 / IEC 60502-1 KABELINDO NYFGbY rm 0.6/1.2 kV 3x25 mm2 (SNI) PVC sheathed with 0.6/1.2 kV rated voltage, the highest voltage of 41 kV . That the cable is capable of withstanding voltages greater than the value set by SPLN.. ...
A Purdue University scientist was part of a global team that has demonstrated a specialized mapping technique that could speed work in genomic fields by quickly finding genetic associations that shape an organisms observable characteristics.
(KudoZ) English to Polish translation of BSA-indexed: wskaznik powierzchni ciala BSA (Body Surface Area) [urine tests - Medical: Cardiology (Medical)].
It occurred to me recently that the world possesses some very powerful intelligent organisms that are directly and clearly opposed to the Singularity ---
... - The Crestron CNXRY installs in any Y-Bus expansion slot of a 2-Series control system to provide 16 isolated, low-voltage relay closures. Each group of
It has been shown that the region of the node can produce sinus tachycardia in the majority of patients. Total ablation of the node from the superolateral aspect of the terminal crest to its distal third produces an unacceptably high requirement for permanent implantation of pacemakers. On the other hand, modification of the node by direct radiofrequency application that is limited to the superolateral aspect of the terminal crest achieves a satisfactory heart rate by preserving part of the sinus node and, consequently, better long term physiological function. Marrouche and colleagues5 emphasised that sinus node modification is more than a focal ablation. Instead, it requires complete abolition of the cranial portion of the node. They cited a mean ablation area of 129 (4) mm by 19 (5) mm. In their series, temporary or permanent sinus arrest, or complete sinoatrial block, did not occur in any of their 39 patients with IST subjected to electroanatomical guided catheter ablation, including the 12 ...
Ventricular tachycardia is one of the commonest cause of sudden death in chronic chagas disease. As most ventricular tachycardias originate from scar in patients with heart disease, catheter ablation is an important step in patient treatment. Identification of fibrosis prior to ablation of sustained ventricular tachycardia (SVT) might reduce the time of anesthesia, procedure time, radiation exposure and possibly the risk of complications. Knowledge of arrhythmia circuit within scar allows planning strategies for each procedure. Condreanu et al. stablished that voltages inferior to 6.52 mV (unipolar) and 1.54mV (bipolar) are useful tools in detecting scar during electroanatomic mapping. Accuracy, however when compared to magnetic resonance imaging is limited due to difficulties in maintaining good contact between ablation catheter and ventricular wall. Contact force catheters might help increase accuracy of voltage mapping because they allow detection of poor contact areas. Although the threshold ...
Your body works better if you use it regularly and well. Lots of people are overweight and out of shape, and when they make the decision to eat sensibly and get out for a walk every day, they find they feel much better.. What you need to know is that some forms of dysautonomia can present like you just need to get more exercise, but actually they are a disease process that inhibits your ability to exercise.. In my case, my diagnosis of IST (Inappropriate Sinus Tachycardia) hinged on the fact that my treadmill testing looked like a basic model "she needs to work out more" case, except that I didnt actually need to work out more.. I presented with shortness of breath on exertion, but every test came back normal. If I had been overweight, I would never have been diagnosed, period.. The only clue we had that I had a tachycardia and not a fitness problem was that (a) my symptoms came on too suddenly to be deconditioning and (b) I wasnt fat enough. I "passed" all tests with three different ...
Free Online Library: Better staging: sentinel node mapping can help in head, neck melanoma.(Clinical Rounds) by Internal Medicine News; Health care industry Health, general
A lead assembly for an implantable medical device includes a lead body having a proximal end and a distal end. One or more connectors at the proximal end of the lead body are each adapted for connection to a pulse generator. One or more conductive elements are coupled to the one or more connectors at the proximal end and extend through the lead body to the distal end. Each of the one or more conductive elements includes an electrode coil that extends from the distal end of the lead body that is formed into a helix having a diameter greater than a diameter of the electrode coil.
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An implantable subcutaneous device includes a lead and electrode for cardiac monitoring and intervention. The device has an implantable lead including a lead body, a subcutaneous electrode supported by the lead body and a pharmacological agent impelled from the device using phoresis. The pharmacological agent provides a therapeutic treatment to subcutaneous non-intrathoracic tissue. A method of implanting subcutaneous leads involves providing a lead including a lead body, a subcutaneous electrode, and a pharmacological agent and using phoresis to impel the pharmacological agent into subcutaneous non-intrathoracic tissue surrounding the lead.
This study describes a noninvasive method for detecting delayed ventricular activation, caused by ischemia, on the body surface. Signal averaging and a newly developed high-pass digital filter were used. The filter has the property that it does not create an artifact or ring after the QRS complex ends, thereby allowing the detection of microvolt-level potentials that occur immediately after the QRS complex. Eleven dogs were studied before and during acute ischemia induced by coronary artery ligation and latex embolization. The ischemic region was mapped with bipolar electrodes and, after the chest was rapidly closed, signal-averaged recordings were made from the body surface. Repeated cycles of ventricular mapping and signal averaging were performed. In each dog, delayed and fractionated electrograms were recorded directly from the ischemic epicardium that lasted a maximum of 118 +/- 18 ms after QRS onset. The duration of the ventricular electrograms varied with time. Whenever delayed epicardial ...
New device facilitates rapid, complex arrhythmia diagnosis and enables physicians to map any chamber of the heart to best determine ablation strategy and optimize patient care
Tech Choice 7015 3-Gang Low Voltage Mounting Bracket (7015) For use with retrofit telephone coax or network installations where an electrical box is not present.
The ability of a numerical procedure to detect and to localize two experimentally induced, epicardial dipolar generators was tested in 24 isolated, perfused rabbit heart preparations, suspended in an electrolyte-filled spherical tank. Electrocardiograms were recorded from 32 electrodes on the surface of the test chamber before and after placement of each of two epicardial burns. The second lesion was located either 180 degrees, 90 degrees, or 45 degrees from the first. Signals were processed by iterative routines that computed the location of one or two independent dipoles that best reconstruced the observed surface potentials. The computed single dipole acounting for 99.68% of root mean sequare (RMS) surface potential recorded after the first burn was located 0.26 +/- 0.10 cm from the centroid of the lesion. Potentials recorded after the second lesions were fit with two dipoles that accounted for 99.36 +/- 1.51% of RMS surface potentials and that were located 0.42 +/- 0.26 cm and 0.57 +/- 0.49 ...
OREANDA-NEWS. September 28, 2016. Uralkali (the Company; MICEX: URKA) held its Extraordinary General Meeting of Shareholders (EGM) in the town of Berezniki (Perm Territory, Russia).. Uralkali s EGM elected the new Board of Directors, including Sergey Chemezov, Dmitry Konyaev, Dmitry Lobyak, Luc Maene, Sir Robert Margetts, Dmitry Mazepin, Dmitry Osipov, Paul Ostling and Dimitry Tatyanin.. The EGM also elected the new Revision Commission.. Uralkali (www.uralkali.com) is one of the world s largest potash producers and exporters. The Company s assets consist of 5 mines and 7 ore-treatment mills situated in the towns of Berezniki and Solikamsk (Perm Territory, Russia). Uralkali employs ca.11,000 people (in the main production unit). Uralkali s shares are traded on the Moscow Exchange. ...
Dr. Mandapati: quantitative analysis of FIRM rotor sites and ablation results. As patients, we should now be skeptical of the FIRM system.
Ediblewildsus Unique The Microsoft Office Suite Has Advanced In Numerous Ways And Has Been Able To Help Many Users Share Data In Between Different Programs Like Ms Excel And With Lovable How To Transfer Data From Ms Excel Into A Word Document And Adorable How To Write Excel Macros As Well As Find And Delete In Excel Additionally Excel Expense Tracker With Excel Workbooks Open Also Excel High School Online In Addition Insert Excel Spreadsheet Into Word Via Idaconcptscom › Gallery ...
Electrogram (EGM) terms pertain to invasive electrophysiologic recording of cardiac impulse conduction. Expand them at first mention. |
Electrogram (EGM) terms pertain to invasive electrophysiologic recording of cardiac impulse conduction. Expand them at first mention. |
A bipolar low-voltage quarter-square multiplier is presented. The proposed multiplier is very simple because the multiplier cell is built from four identic
|p|For Use with Magnetic Low Voltage Transformers. Large Paddle Switch with a Captive Linear-Slide Control for a Standard Designer Wallplate Opening. Features a Built-In Soft-Glow Night Light. Uses Standard Single-Pole Wiring for Easy Installation in Any
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The BlueMon monitoring system is a comprehensive monitoring and mapping system for all emissions on vessels which are subject to MARPOL 73/78 Annex I-VI ...
The BlueMon monitoring system is a comprehensive monitoring and mapping system for all emissions on vessels which are subject to MARPOL 73/78 Annex I-VI ...
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You are at: Home » Products » Diagnosis Equipment » HP one piece 3-lead ECG cable In total 213268 number ofProductsinfo,Released today. 0 number of ...
I answered it as best as I could with the estimation we could reach a singularity. Where science as we call it today would fit into that picture I havent...
We studied the evolution of body-surface potential map (BSPM) patterns in 32 patients following first acute inferior myocardial infarction. Initial BSPMs were obtained at a mean of 79 hours post-infarction; follow-up BSPMs, a mean of eight months post-infarction. Temporal area-of-difference maps, constructed by subtracting initial from follow-up group-mean BSPMs, revealed reciprocal changes over the superior and inferior torso for both Q-zone and ST-segment time-integral distributions. The temporal changes in Q-zone patterns were small but definite: over the inferior torso there was a relative gain in Q-zone values and, over the superior torso, a relative decrease. In contrast, there were marked spatial and quantitative changes of ST-segment distributions during the follow-up period. Over the superior torso, particularly anteriorly, there was a gain in ST-segment values; over the inferior torso, a decrease. With the small temporal changes in Q-zone time-integral distributions, individual Q-zone maps
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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Dr. Cuculich introduced new concepts in the use of ECGI (at least to this author)-phase mapping and the importance of wavefronts or wavelet transformation in A-Fib signals. "ECGI uses wavelet transform looking at pure activation time." He asked, "how does…phase mapping affect the result?" He related phase mapping to the CONFIRM concept of "phase lock" where a simple 12-lead ECG analysis can classify A-Fib mechanistically.3. Doctors (and we patients) are still struggling to understand what phase mapping and wavelet transformation actually mean. Dr. Cuculichs studies of phase mapping techniques (Hilbert transform) in A-Fib show that phase mapping highlights and accentuates the curvature of a wavefront and thus indicates a rotor is present. According to Dr. Cuculich, phase mapping is highly dependent on the chosen cycle length. He concluded that "while published ECGI data used wavelet transform to identify activation patterns, phase mapping techniques (when performed carefully and correctly) may ...
During internal defibrillation, potential gradients greater than 100 V/cm occur near defibrillation electrodes. Such strong fields may cause deleterious effects, including arrhythmias. This study determined 1) the effects of such strong fields on the propagation of activation and 2) whether these effects were different for monophasic and biphasic shocks. Voltages and potential gradients during the shock, as well as activation sequences before and after the shock, were mapped from 117 epicardial electrodes placed over a 3 x 3-cm area on the right ventricle in six dogs. Pacing at a cycle length of 350 msec was given from a long narrow electrode on the right side of the mapped area to generate parallel activation isochrones. A monophasic shock, 10 msec in duration, or a biphasic shock with both phases 5 msec in duration was delivered 300 msec after the last paced stimulus via a mesh electrode on the left side of the mapped area as the cathode, with the anode on the right atrium. Shocks of 70-850 V ...
CONCEPTUAL GIS Systematic Application of GIS in Mineral Exploration database Mineralization processes Conceptual models Knowledge-base Mappable exploration criteria Spatial proxies Processing Predictor maps Overlay CONCEPTUAL GIS MODEL Favorability map Validation MINERAL POTENTIAL MAP
Return to index TSX-V: DOS MARCH 18, 2010 DIOS U33 PROJECT HOSTS ROCKS GRADING 9.9 and 7.7 GRAMS PER TON GOLD MONTREAL, QUEBEC, CANADA DIOS EXPLORATION INC. reports values of up to 9.9 and 7.7 grams per ton gold in outcropping rocks on its new wholly owned diamond-gold U33 exploration project, James Bay, Quebec. The DIOS U33 property east block hosts the Fallara gold showing that assayed 9.9 g/t Au (gold), 7.7 g/t Au, 0.17 g/t Au and 2.5% As (arsenic) in association with pyrite disseminations in silicified intermediate volcanics (government file (MRNFQ, 2000). The Fallara gold showing was found by Quebec government geologists in 1997. No further work on this showing was filed. It might be explained because the claims then belonged to INCO (nickel exploration). A gold potential map (PRO 2007-05) that highlights the area as highly prospective for gold was later published by the Quebec government and the showings are located within 10 kilometers from Eastmain Resources Clearwater gold deposit (1.09 ...
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Martin Ford in The Lights in the Tunnel: Automation, Accelerating Technology and the Economy of the Future[41] postulates a "technology paradox" in that before the singularity could occur most routine jobs in the economy would be automated, since this would require a level of technology inferior to that of the singularity. This would cause massive unemployment and plummeting consumer demand, which in turn would destroy the incentive to invest in the technologies that would be required to bring about the Singularity. Job displacement is increasingly no longer limited to work traditionally considered to be "routine".[42] Joan Slonczewski and Adam Gopnik argue that the Singularity is a gradual process; that as humans gradually outsource our abilities to machines,[43] we redefine those abilities as inhuman, without realizing how little is left. This concept is called the Mitochondrial Singularity.[44] The idea refers to mitochondria, the organelle that evolved from autonomous bacteria but now powers ...
Kavuru, Madhav S.; Vesselle, Hubert; Thomas, Cecil W. (1987). Advances in Body Surface Potential Mapping (BSPM) Instrumentation ... and LL to give an average potential of the body: V. W. =. 1. 3. (. R. A. +. L. A. +. L. L. ). {\displaystyle V_{W}={\frac {1}{3 ... Electrodes are the actual conductive pads attached to the body surface. Any pair of electrodes can measure the electrical ... Look at electrical activity from the vantage point of the inferior surface (diaphragmatic surface of heart) ...
Kavuru, Madhav S.; Vesselle, Hubert; Thomas, Cecil W. (1987). "Advances in Body Surface Potential Mapping (BSPM) ... and LL to give an average potential across the body: V W = 1 3 ( R A + L A + L L ) {\displaystyle V_{W}={\frac {1}{3}}(RA+LA+LL ... A "lead" is not the same as an "electrode". Whereas an electrode is a conductive pad in contact with the body that makes an ... In a conventional 12-lead ECG, ten electrodes are placed on the patient's limbs and on the surface of the chest. The overall ...
This is a type of specialized brain and body scan used to map neural activity in the brain or spinal cord of humans or other ... These, however, pick up signals better from the brain surface, and less well from deeper structures such as the hippocampus.[ ... The local field potential, which includes both post-neuron-synaptic activity and internal neuron processing, better predicts ... Raichle, M. E. (2000), Toga, A. W.; Mazziotta, J. C. (eds.), Brain mapping: the systems, London: Academic Press, ISBN 978-0-12- ...
... geological and compositional mapping of the surface; Study of the physical properties of the icy crusts; Characterisation of ... will perform detailed investigations on Ganymede as a planetary body and evaluate its potential to support life. Investigations ... all of which are thought to have significant bodies of liquid water beneath their surfaces, making them potentially habitable ... and on understanding the formation of surface features and the composition of the non-water-ice material. Furthermore, JUICE ...
... body surface potential mapping MeSH E01.370.405.245 --- electroencephalography MeSH E01.370.405.245.100 --- alpha rhythm MeSH ... body surface potential mapping MeSH E01.370.370.380.240.230 --- electrocardiography, ambulatory MeSH E01.370.370.380.240.850 ... body surface potential mapping MeSH E01.370.370.380.245 --- electrophysiologic techniques, cardiac MeSH E01.370.370.380.250 ... body surface potential mapping MeSH E01.370.405.240.230 --- electrocardiography, ambulatory MeSH E01.370.405.240.850 --- ...
... surface water-bodies, wetlands, coastal land use, ground-water targets, urban land use etc. have provided the basis for ... Assessing deforestation Mapping urban areas for planning purposes Delineating ocean areas with higher fish catch potential and ... The agency has executed several projects under National mapping missions wherein mapping and inventory of forests, wastelands, ... Mapping of forests and grasslands. Monitoring of forest encroachment and shifting cultivation Forest fire surveillance. Mapping ...
Mwc - Derived from a centroid moment tensor inversion of intermediate- and long-period body- and surface-waves. Mww - Derived ... Potential energy is stored in the crust in the form of elastic energy due to built-up stress and gravitational energy. During ... "Glossary of Terms on Earthquake Maps". USGS. Archived from the original on 2009-02-27. Retrieved 2009-03-21. "USGS Earthquake ... or a surface-wave or body-wave magnitude). Because the scales are intended to report the same results within their applicable ...
Sample types have included: surface and underground grab samples, surface and underground drill core samples, drill sludge ... In 1893, Map #27 by the Geological Survey Department was produced by E.R. Faribault to illustrate a report commissioned by the ... This comparison indicates that a potential for a larger deposits exists on Orex's property. Two different approaches to ... 1.19 to 2.42 g/t Main Ore Body: 19,500,000 tonnes @ 0.75 to 3.37 g/t West Goldbrook Area: 8,614,817 tonnes @ 0.53 to 0.84 g/t ...
Interferometric Synthetic Aperture Radar (InSAR) can generate maps of surface deformation or elevation, using satellite radar ... In addition to a wide variety of commercial projects, they have a significant involvement with national and European bodies ... Offshore, NPA's Global Offshore Seep Project uses SAR data to detect oil seepage from potential reservoirs. ... NPA Satellite Mapping is the longest-established satellite mapping specialist in Europe, with expertise in geoscience ...
Areas PV and S2 both map the body surface. Functional neuroimaging in humans has revealed that in areas PV and S2 the face is ... using evoked potentials and electrical stimulation. Experiments involving ablation of the second somatosensory cortex in ... Individual neurons in areas PV and S2 receive input from wide areas of the body surface (they have large "receptive fields"), ... Areas S2 in the left and right hemispheres are densely interconnected, and stimulation on one side of the body will activate ...
Pressure in a static body of water increases proportionally to the depth below the surface of the water. The surfaces of ... This means that gravitational potential energy on a contour map is proportional to altitude. On a contour map, the two- ... The gravity potential is the gravitational potential energy per unit mass. In electrostatics the electric potential is the ... It has a potential energy U = m g h {\displaystyle U=mgh} where U is the gravitational potential energy and h is the height ...
... or a downhole tool lowered into a borehole which transects a body of mineralisation. These methods can map out sulphide bodies ... Surface EM methods are based mostly on Transient EM methods using surface loops with a surface receiver, ... They are used to map the subsurface distribution of stratigraphy and its structure which can be used to delineate potential ... Surface loop surveys are rarely used for regional exploration, however in some cases such surveys can be used with success (e.g ...
The mapping of the body surfaces in the brain is called somatotopy. In the cortex, it is also referred to as the cortical ... They react in quick action potentials, especially to vibrations around 250 Hz (even up to centimeters away). They are the most ... This brain-surface ("cortical") map is not immutable, however. Dramatic shifts can occur in response to stroke or injury. The ... Proske, U; Gandevia, SC (Oct 2012). "The proprioceptive senses: their roles in signaling body shape, body position and movement ...
This is a type of specialized brain and body scan used to map neural activity in the brain or spinal cord of humans or other ... It can also record signal from all regions of the brain, unlike EEG/MEG, which are biased toward the cortical surface. But fMRI ... The local field potential, which includes both post-neuron-synaptic activity and internal neuron processing, better predicts ... As this proportion fell, a map of blood flow in the brain was seen in the MRI. They verified this by placing test tubes with ...
Iron occurrences were observed during initial geological mapping of the area in the mid thirties but the economical potential ... Sixteen ore bodies extending for up to 3 km and 100m thick. Amenable to open pitting. Coal resource nearby suitable for blast ... The oxidised ores, extending up to 130m below ground surface, consist mainly of magnetite, martite and hydrogoethite. Two other ... The regional geology was mapped at 1:50 000 while the Hajigak deposit was mapped at 1:10 000. Focusing on the western area of ...
Among Solar System bodies, Ceres is intermediate in size between the smaller Vesta and the larger Tethys. Its surface area is ... Ceres - Maps of bright areas Ceres' oblateness is consistent with a differentiated body, a rocky core overlain with an icy ... ISBN 0-19-958645-4. Castillo-Rogez, J. C.; Conrad, P. G. (2010). Habitability Potential of Ceres, a Warm Icy Body in the ... "SPHERE Maps the Surface of Ceres". Retrieved 8 September 2015. Martinez, Patrick, The Observer's Guide to Astronomy, page 298. ...
... also known as brain electrical activity mapping or BEAM ) The heart is the muscle that pumps oxygenated blood to the whole body ... EMG measures action potentials, called Motor Unit Action Potentials (MUAPs), created during muscle contraction. A few common ... Using surface EMG and a torque motor, Levin et al. (1994, 2000) demonstrated a direct relationship between the velocity of ... However, visual evoked potentials do play a role in the whole diagnostic process. Parkinson's disease is a degenerative ailment ...
Identify potential agriculture lands and changes. Rapid monitoring Dynamic land covers like surface water, forest, waste lands ... like map visualisation up to original mapping scale, LULC statistics generation at national, state and district level (based on ... The seasonal water body and snow cover distributions can also be visualised. The web portal provides spatial variability of the ... Mapping of land use/land cover (LULC) on 1:250,000 scale has been envisaged under Natural Resource Census (NRC) project of ...
The residual Bouguer potential is contributed by the mantle. The undulation of the crust-mantle boundary, or the Moho surface, ... A separate free-air gravity anomaly map, Bouguer gravity anomaly map and a map of crustal thickness were produced along with ... Simply, if Mars is assumed to be a static perfectly spherical body of radius RM, provided that there is only one satellite ... The measured gravitational potential of Mars from orbiters could be generalized as the equation below, V ( M a r s ) = V ( S o ...
Sparks often indicate the presence of a high voltage, or "potential field". The higher the voltage; the farther a spark can ... This plasma is heated to temperatures often greater than the surface of the sun, and can cause small, localized burns. ... Conductive liquids, gels or ointments are often used when applying electrodes to a person's body, preventing sparks from ... Kryzhanovsky, L. N. (1989). "Mapping the history of electricity". Scientometrics. 17: 165. doi:10.1007/BF02017730. Heilbron, J ...
... for male spider venom 3.3 mg/kg body weight of the mouse and for female spider venom 50 mg/kg body weight were found. The LD50 ... These charged residues form three patches on the surface. Patch A consists of the positively charged residues 3,4 and 5, patch ... Studies will contribute to a more detailed mapping of site-3, the neurotoxin receptor site on the sodium-channel and provide ... d-ACTX-Ar1a causes a prolongation of action potential duration, accompanied by spontaneous repetitive firing, but does not ...
The chronaxie values for mammalian ventricles at body temperature range from 0.5 ms (human) to 2.0 to 4.1 ms (dog); this is an ... An electrode is inserted into the muscle of interest, which is then stimulated using surface current. Chronaxie values increase ... Data reported in the literature use either motor response as the physiological threshold in humans or action potential ... Data derived from micro-electrode stimulation and physiological mapping of sensory thalamus are scarce. The two stimulation ...
Aquilanti, V.; Grossi, G.; Laganà, A. (1982). "On hyperspherical mapping and harmonic expansions for potential energy surfaces ... effort has concerned the formulation and implementation of the treatment of the dynamics of processes involving few bodies, ...
Cave diving is a form of penetration diving, meaning that in an emergency a diver cannot ascend directly to the surface due to ... resulting in potential deep diving risks. Graham Balcombe (8 March 1907 - 19 March 2000), a founder of the Cave Diving Group ... maps and articles on shipwrecks, editor, a founder of Sea Research Society in 1972 Robert Sténuit (born 1933), underwater ... Australian cave diver who died attempting to recover the body of another diver from Bushman's Hole in South Africa Jack ...
... "build a series of projects that map the surfaces of rocky worlds and explore the atmospheres of planets and small bodies the ... leveraging its advantages against student time constraints and potential bandwidth limitations. Gay's work on Exploring the ... mapping and characterization of surface features using visual data provided by NASA missions. Crater counting is described as " ... "a valuable exercise, but it's hard to automate." Surface features, such as the size and degradation of craters, are identified ...
... the complex motor skills of octopuses are not organised in their brain via an internal somatotopic map of its body, instead ... The interior surfaces of the arms are covered with circular, adhesive suckers. The suckers allow the octopus to anchor itself ... This form of locomotion allows these octopuses to move quickly away from a potential predator without being recognised.[76] A ... Some species differ in form from the typical octopus body shape. Members of the suborder Cirrina have stout gelatinous bodies ...
Abstract 14005: Body Surface Potential Mapping Improves Diagnosis of ST-Elevation Myocardial Infarction in Patients With ... Abstract 14005: Body Surface Potential Mapping Improves Diagnosis of ST-Elevation Myocardial Infarction in Patients With ... Abstract 14005: Body Surface Potential Mapping Improves Diagnosis of ST-Elevation Myocardial Infarction in Patients With ... Abstract 14005: Body Surface Potential Mapping Improves Diagnosis of ST-Elevation Myocardial Infarction in Patients With ...
Body surface potential mapping of ST segment changes in acute myocardial infarction. Implications for ECG enrollment criteria ... Body surface potential mapping of ST segment changes in acute myocardial infarction. Implications for ECG enrollment criteria ... Body surface potential mapping of ST segment changes in acute myocardial infarction. Implications for ECG enrollment criteria ... Body surface potential mapping of ST segment changes in acute myocardial infarction. Implications for ECG enrollment criteria ...
This study describes a practical approach for the extraction of diagnostic information from body surface potential maps. Body ... It is concluded that this approach achieves efficient information extraction from body surface potential maps for improved ... of best electrocardiographic leads for diagnosing myocardial infarction by statistical analysis of body surface potential maps. ... surface potential map data from 361 subjects were used to identify optimal subsets of leads and features to distinguish 184 ...
Body surface potential mapping (BSPM) records ECG with multiple leads covering the entire thorax, with a variety of ECG ... Assessment of myocardial infarction injury by strain rate imaging and body surface potential mapping. Show full item record ... Vi registrerade EKG hos infarktpatienter över hela bröstkorgen medelst 120 elektroder (body surface potential mapping, BSPM) ... Assessment of myocardial infarction injury by strain rate imaging and body surface potential mapping. ...
Non-Invasive Personalisation of a Cardiac Electrophysiology Model from Body Surface Potential Mapping. August 24, 2017 ... We use non-invasive data (body surface potential mapping, BSPM) to personalize the main parameters of a cardiac ... First, an efficient forward model is proposed, coupling the Mitchell-Schaeffer transmembrane potential model with a current ...
... ... The bivariate correlations of the various indirect measures of exercise myocardial ischemia and myocardium at potential for ...
... ... Exercise Body Surface Potential Mapping in Single and Multiple Coronary Artery Disease: Results (Part 2) ... Exercise Body Surface Potential Mapping in Single and Multiple Coronary Artery Disease: Methods (Part 1) ... Exercise Body Surface Potential Mapping in Single and Multiple Coronary Artery Disease: Methods (Part 3) ...
Kavuru, Madhav S.; Vesselle, Hubert; Thomas, Cecil W. (1987). Advances in Body Surface Potential Mapping (BSPM) Instrumentation ... and LL to give an average potential of the body: V. W. =. 1. 3. (. R. A. +. L. A. +. L. L. ). {\displaystyle V_{W}={\frac {1}{3 ... Electrodes are the actual conductive pads attached to the body surface. Any pair of electrodes can measure the electrical ... Look at electrical activity from the vantage point of the inferior surface (diaphragmatic surface of heart) ...
... were assessed by 87-lead body surface potential mapping (BSPM). The BSPM, noninvasive technique with semi-automatic readings, ... therapy on the ventricular repolarization of heart failure patients as assessed by body surface potential mapping.. Pastore CA1 ...
Assessment of body surface potential mapping in diabetic patients with recognized depression.. Janocha A, Bolanowski M, ... OBJECTIVES: Parameters of body surface potential mapping (BSPM) in DM II patients are significantly different comparing with ... Assessment of body surface potential mapping in diabetic patients with recognized depression. Neuro Endocrinol Lett. 2017 Jan; ... Body Surface Potential Mapping:methods, Depression:complications, Diabetes Mellitus:diagnosis, Electrocardiography:methods, ...
Introduction: Epicardial potentials (EP) derived from the body surface potential map (BSPM) improve acute myocardial infarction ... Epicardial Potentials computed from the Body Surface Potential Map using inverse electrocardiography and an individualised ... Epicardial Potentials computed from the Body Surface Potential Map using inverse electrocardiography and an individualised ... A cardiologist blinded to both the 12-lead ECG and BSPM interpreted the EP map. AMI was defined as cTnT ≥0.1µg/L.Results: ...
Clinical use of body surface potential mapping in cardiac arrhythmias. Dictionary browser ? ...
ECG/body surface potential mapping/holter. 42. Echo/Doppler (coronary). 43. Echo/Doppler (myocardium). ...
Body surface potential mapping (BSPM) (Figure 6 [Fig. 6]) uses 64 or more electrodes (as many as 120) to record and measure ... Body surface potential mapping. Multichannel ECG provides comprehensive 3-dimensional data of the electrical currents from the ... Krenzke G, Kindt C, Hetzer R. Corrected body surface potential mapping. Biomed Tech (Berl). 2007;52(1):37-42. DOI: 10.1515/BMT. ... Medvegy M, Duray G, Pint r A, Pr da I. Body surface potential mapping: historical background, present possibilities, diagnostic ...
Endocardial mapping of localized sources driving atrial fibrillation (AF) in humans has not been reported. METHODS AND RESULTS ... Body Surface Potential Mapping*. Catheter Ablation*. Catheterization. Electrocardiography. Electrophysiology. Female. Humans. ... BACKGROUND: Endocardial mapping of localized sources driving atrial fibrillation (AF) in humans has not been reported. METHODS ... During AF with a cycle length of 211+/-32 ms, activation mapping identified 1 to 3 sources at the origin of atrial wavefronts ...
Body Surface Potential Mapping*. Cardiography, Impedance. Electric Conductivity. Electrocardiography. Fetal Diseases / ... The heart generates magnetic fields that can be detected by body surface mapping utilizing super conducting quantum ... noninvasive His potential recording, detection of arrhythmic mechanism defining reentrant circuits vs non reentrant mechanism, ... are increased sensitivity to small signals and lack of conductivity in body tissues, presentation of direct component signals ...
We hypothesized that mapping could be achieved using an angioplasty guidewire in the coronary circulation, to g ... Body Surface Potential Mapping. Catheterization*. Coronary Vessels. Electrophysiologic Techniques, Cardiac*. Ethanol / ... 1269077 - Experimental evidence for regional cardiac influence in body surface isopotential maps .... 18990637 - T-wave ... One VT per patient was mapped (CL 348 +/- 102.1 ms). Diastolic potentials were recorded from all (77.7 +/- 43.8 ms pre-QRS ...
... this is sometimes known as body surface potential mapping.. Internal electrocardiograms may also be recorded by implanted ... The vast majority of electrocardiograms are recorded by placing electrodes on various sites on the body surface, typically the ...
... the electrophysiological basis of late potentials, mechanism of arrhythmias, the different methods of recording and anal ... Body surface mapping of late potentials Yukio Ozawa. Pages 151-171 * Twenty-four hour analysis for late potential activity: ... Spectrotemporal mapping of the surface ECG for detection of ventricular late potentials ... Modulating effect of ischemia on late potentials Michael Ya. Ruda, Irina N. Merkulova, Irina D. Strazhesko, Irina V. Savelieva ...
... was regionally related to areas of most pronounced R-amplitude attenuation as assessed by body surface potential mapping. ... Family relatives were studied by ECG, Holter ECG, echocardiography, ECG body surface potential mapping, and cardiac magnetic ... Corrected body surface potential mapping.. *Gerhard Krenzke, Carsten M Kindt, Roland Hetzer ...
The non-invasive localization of focal heart activity via body surface potential measurements (BSPM) could greatly benefit the ... Action Potentials / physiology*. Body Surface Potential Mapping / instrumentation*, methods*. Equipment Design. Equipment ... The non-invasive localization of focal heart activity via body surface potential measurements (BSPM) could greatly benefit the ... Electric potentials were measured on the torso surface for single dipoles with and without further uncorrelated or correlated ...
Acute Coronary Syndrome; Emergency Service, Hospital; Body Surface Potential Mapping; Myocardial Infarction; Chest Pain ... Weight Loss; Obesity; Resistance Training; Body Composition; Osteoarthritis, Knee Academic: 336-713-8116. Department: 336-713- ...
Body Surface Potential Mapping for Detection of Myocardial Infarct Sites. P Zarychta, FE Smith, ST King, AJ Haigh, A Klinge, D ... VVRED Group member Milan Horáček (Dalhousie University) provided body surface potential mapping (BSPM) capability for MALT ... and he is now conducting a study aimed at delineating healed infarcts based on body surface potential maps in 40 of these ... The BSPM data, consisting of ECG data for 352 torso-surface sites, are provided in easy-to-read ASCII format for a single ...
NOVOTNÁ, P. Body Surface Potential Mapping in Animal Experiments - pilot study. In Proceedings of the 25th Conference STUDENT ... OLEJNÍČKOVÁ, V.; JANOUŠEK, O.; RONZHINA, M.; HEJČ, J.; KVASILOVA, A.; ZABRODSKA, E.; SEDMERA, D. Optical mapping can reveal two ... KOŠČOVÁ, P.; SEDLÁŘ, K.; KUPKOVÁ, K.; KOLEK, J.; PATÁKOVÁ, P.; PROVAZNÍK, I. Tertiary Structure Prediction of Potential Efflux- ... ŠKUTKOVÁ, H.; MADĚRÁNKOVÁ, D.; SEDLÁŘ, K.; JUGAS, R.; VÍTEK, M. A degeneration-reducing criterion for optimal digital mapping ...
... body surface potential mapping, ST-T isointegral maps. Application of body surface potential mapping in coronary artery disease ...
  • Thus, BSPM has the potential to reduce morbidity and improve survival in this high-risk patient group by facilitating emergent revascularization. (ahajournals.org)
  • METHODS AND RESULTS The present study compares 120-lead body surface potential map (BSPM) data from 131 patients with acute MI and 159 normal control subjects (N). The MI population was stratified according to the location of ventricular wall motion abnormalities evidenced by radionuclide imaging into 76 patients with anterior MI (AMI), 32 patients with inferior MI (IMI), and 23 patients with posterior MI (PMI). (ahajournals.org)
  • Body surface potential mapping (BSPM) records ECG with multiple leads covering the entire thorax, with a variety of ECG variables automatically calculated from its recordings. (helsinki.fi)
  • We use non-invasive data (body surface potential mapping, BSPM) to personalize the main parameters of a cardiac electrophysiological model for predicting the response to different pacing conditions. (embs.org)
  • In this study, a series of 60 patients (61.7% male, mean age 59.2+/-11.54 years) in NYHA functional class III-IV heart failure and LBBB, who received CRT through implantation of atrial-biventricular pacemakers, were assessed by 87-lead body surface potential mapping (BSPM). (nih.gov)
  • Parameters of body surface potential mapping (BSPM) in DM II patients are significantly different comparing with healthy non-diabetic subjects. (nel.edu)
  • BSPM recordings were displayed in a form of the Int-QRST maps. (nel.edu)
  • Introduction: Epicardial potentials (EP) derived from the body surface potential map (BSPM) improve acute myocardial infarction (AMI) diagnosis. (ulster.ac.uk)
  • In this study, we compared EP derived from the 80-lead BSPM using a standard thoracic volume conductor model (TVCM) with those derived using a patient-specific torso model (PSTM) based on body mass index (BMI).Methods: Consecutive patients presenting to both the ED and pre-hospital coronary care unit between August 2009 and August 2011 with acute ischaemic-type chest pain at rest were enrolled. (ulster.ac.uk)
  • 0.3mV defined STE. A cardiologist blinded to both the 12-lead ECG and BSPM interpreted the EP map. (ulster.ac.uk)
  • The non-invasive localization of focal heart activity via body surface potential measurements (BSPM) could greatly benefit the understanding and treatment of arrhythmic heart diseases. (biomedsearch.com)
  • VVRED Group member Milan Horáček (Dalhousie University) provided body surface potential mapping (BSPM) capability for MALT patients returning for their one-year follow-up MRI, and he is now conducting a study aimed at delineating healed infarcts based on body surface potential maps in 40 of these patients. (physionet.org)
  • The comparison with the body surface potential mappings (BSPM) measured during pacing and the ECGI method indicates a good predictive power. (archives-ouvertes.fr)
  • Spatial variation of the electrical potential is captured by the system's ability to occupy the same three-dimensional coordinate set for repeated measurements of the desired site. (freepatentsonline.com)
  • Such a spread does not preserve spatial relationships, and the potential measured at a given body-surface point (ECG electrode) reflects potentials over the entire heart. (ahajournals.org)
  • In the second step, these magnetic particles are made detectable by applying a magnetic field - known as a drive field - which gives them a magnetic resonance of their own, rendered by 3D-imaging software as spatial maps of the body. (epo.org)
  • An apparatus for localizing action currents in the heart of a living subject has electrodes for acquiring a distribution of electrical potential on the body surface of the living subject generated by the action currents, a position acquisition unit for determining the spatial position of the electrodes, and a localization unit connected to the electrodes and to the position acquisition unit. (google.com)
  • The localization unit localizing the action currents from the distribution of potential and the spatial position of the electrodes. (google.com)
  • Verification of high arsenic contamination was made by collection samples and analysis of arsenic content and interpolation surface by spatial anisotropic method. (hindawi.com)
  • Interpolation surface of the analysed arsenic content using spatial anisotropic would verify the potential arsenic contamination location obtained from fuzzy overlay outputs. (hindawi.com)
  • Both outputs of the spatial surface anisotropic and the fuzzy overlay mapping were significantly spatially conformed. (hindawi.com)
  • Exploration geophysics is also used to map the subsurface structure of a region, to elucidate the underlying structures, spatial distribution of rock units, and to detect structures such as faults, folds and intrusive rocks. (wikipedia.org)
  • The portal provides various online GIS utilities to its users (without having any specific GIS s/w installed at client's machine) like map visualisation up to original mapping scale, LULC statistics generation at national, state and district level (based on user defined selection), online linking of socioeconomic data, basic and user defined queries, GIS analysis, online map compositions, multi-temporal spatial visualisation etc. (wikipedia.org)
  • The following outline is provided as an overview of and topical guide to brain mapping: Brain mapping - set of neuroscience techniques predicated on the mapping of (biological) quantities or properties onto spatial representations of the (human or non-human) brain resulting in maps. (wikipedia.org)
  • Georeferencing digital outcrop models allows for integration with other spatial data, e.g. results of digital geologic mapping or GIS. (wikipedia.org)
  • methods for detecting acute coronary syndrome without ST elevation are Body Surface Potential Mapping, functional imaging and CGM. (egms.de)
  • During AF with a cycle length of 211+/-32 ms, activation mapping identified 1 to 3 sources at the origin of atrial wavefronts in 38 patients (76%) predominantly in the left atrium, including the coronary sinus region. (biomedsearch.com)
  • Using ECG and existing endocardial mapping data, a coronary artery supplying the predicted VT origin was selected. (biomedsearch.com)
  • The clinical availability of MPI would indicate a new level of mapping coronary pathways and detecting arterial blockages. (epo.org)
  • The filter has the property that it does not create an artifact or ring after the QRS complex ends, thereby allowing the detection of microvolt-level potentials that occur immediately after the QRS complex. (physiology.org)
  • The most direct method of detection of ore via magnetism involves detecting iron ore mineralisation via mapping magnetic anomalies associated with banded iron formations which usually contain magnetite in some proportion. (wikipedia.org)
  • Electromagnetic (EM) surveys can be used to help detect a wide variety of mineral deposits, especially base metal sulphides via detection of conductivity anomalies which can be generated around sulphide bodies in the subsurface. (wikipedia.org)
  • Examples of such applications are the monitoring of vegetation health by means of time-series analyses with vegetation indices, long term land cover changes (e.g. to monitor deforestation rates), global snow cover trends, water inundation from pluvial, riverine, or sea level rise flooding in coastal areas, change of water levels of major lakes such as the Aral Sea, and the detection and mapping of wildland fires in the United States. (wikipedia.org)
  • Because of their large surface area to volume ratio, insects are particularly sensitive to humidity, and its detection can influence their survival. (wikipedia.org)
  • Traditional methods of exoplanet detection rely on indirect means of inferring the existence of orbiting bodies. (wikipedia.org)
  • The JUpiter ICy moons Explorer (JUICE) will perform detailed investigations on Ganymede as a planetary body and evaluate its potential to support life. (wikipedia.org)
  • It's much easier to survive on a complex planetary body bearing the mineral products of complex geology than on a simpler body like the moon or asteroids. (wikipedia.org)
  • Permanent human habitation on a planetary body other than the Earth is one of science fiction's most prevalent themes. (wikipedia.org)
  • Whenever delayed epicardial electrograms were recorded, filtered signal-averaged leads showed microvolt-level potentials early in the S-T segment that were continuous with the QRS complex. (physiology.org)
  • Additionally, the local electrograms at each point can be gated to a preselected reference electrogram to create activation or propagation color-coded maps as well as a voltage map that can be superimposed on the anatomical map of the chamber. (eplabdigest.com)
  • This is a type of specialized brain and body scan used to map neural activity in the brain or spinal cord of humans or other animals by imaging the change in blood flow ( hemodynamic response ) related to energy use by brain cells. (wikipedia.org)
  • These effects are not explained by conventional ECG theory but they do explain why body surface ST depression does not localise cardiac ischaemia in humans. (edu.au)
  • In humans the body map is not apparent. (wikipedia.org)
  • Referring to a common salt of fluoride, sodium fluoride (NaF), the lethal dose for most adult humans is estimated at 5 to 10 g (which is equivalent to 32 to 64 mg/kg elemental fluoride/kg body weight). (wikipedia.org)
  • Tranquility Base (Latin: Statio Tranquillitatis) is the site on the Moon where, in 1969, humans landed and walked on another celestial body for the first time. (wikipedia.org)
  • By mapping the normal microbial make-up of healthy humans using genome sequencing techniques, the researchers of the HMP have created a reference database and the boundaries of normal microbial variation in humans. (wikipedia.org)
  • Humans can also cause surface water to be "lost" (i.e. become unusable) through pollution. (wikipedia.org)
  • Concerned about the potential risks associated with both failure to recognise such an important and potentially life-threatening diagnosis and with those associated with over-diagnosis, over-investigation and over-treatment, you wonder whether the presence of ST elevation in aVR is a specific marker of that diagnosis. (bestbets.org)
  • In this article we present five such patients and evaluate retrospectively the mechanisms of precordial ST segment elevation on 12 lead surface ECG in these patients. (bmj.com)
  • The company also supply satellite and airborne derived terrain and elevation products, including Digital Elevation Models (DEMs), building height maps, 3D views and fly-throughs. (wikipedia.org)
  • Prolongation of the QT interval of the electrocardiogram (ECG), underlain by prolongation of the action potential duration (APD) at the cellular level, is linked to increased vulnerability to cardiac arrhythmia. (frontiersin.org)
  • The project is partnered with NASA missions, including NASA's Dawn, the Lunar Reconnaissance Orbiter (LRO), MESSENGER, and Space Telescope Science Institute (STScI) teams, to "build a series of projects that map the surfaces of rocky worlds and explore the atmospheres of planets and small bodies the solar system over. (wikipedia.org)
  • Six hours later, the two astronauts exited the spacecraft and spent 2 hours 31 minutes on the lunar surface, examining and photographing it, setting up some scientific experiment packages, and collecting 47.5 pounds (21.5 kg) of dirt and rock samples for return to Earth. (wikipedia.org)
  • It is listed on lunar maps as Statio Tranquillitatis, conforming to the standard use of Latin names for lunar place names. (wikipedia.org)
  • Starting in 1963, the Astrogeology Research Program played an important role in training astronauts destined to explore the lunar surface and in supporting the testing of equipment for both manned and unmanned missions. (wikipedia.org)
  • This training was essential to giving astronauts the skills and understanding to make observations about what they would see on the lunar surface and to collect samples for later study back on Earth. (wikipedia.org)
  • Cameras planned for use in the Surveyor project were tested on the Bonito Flow in Sunset Crater National Park because the lava flow appeared to be similar to flows on the lunar surface. (wikipedia.org)
  • Water molecules are also detected in the thin layer of gases above the lunar surface. (wikipedia.org)
  • Water (H2O), and the chemically related hydroxyl group (-OH), can also exist in forms chemically bound as hydrates and hydroxides to lunar minerals (rather than as free water), and evidence strongly suggests that this is indeed the case in low concentrations over much of the Moon's surface. (wikipedia.org)
  • M3 was aimed at providing the first mineral map of the entire lunar surface. (wikipedia.org)
  • Although trace amounts of water were found in lunar rock samples collected by Apollo astronauts, this was assumed to be a result of contamination, and the majority of the lunar surface was generally assumed to be completely dry. (wikipedia.org)
  • A series of bursts of water vapor ions were observed by the instrument mass spectrometer at the lunar surface near the Apollo 14 landing site. (wikipedia.org)
  • Exploration of the lunar surface by spacecraft began in 1959 with the Soviet Union's Luna program. (wikipedia.org)
  • In this early phase of her career, Stuart drew significant inspiration from recently released photographs of the surface of the moon, and saw parallels between her early rubbings and these lunar landscapes. (wikipedia.org)
  • Eventually the USSR managed a lunar impact with "Luna 2", a three component magnetometer, finding no significant magnetic field in close approach to the surface. (wikipedia.org)
  • The Lunar Prospector-1 uses ring-coil made of these alloys extended away from each other and its spacecraft to look for remnant magnetism in the moons 'non-magnetic' surface. (wikipedia.org)
  • P wave changes in body surface potential maps due to increasing heart rate during exercise in normals. (nii.ac.jp)
  • The electromagnetic fields originating from electrical activity of the heart are attenuated in the body volume and only low-resolution information content can be detected on the thorax surface. (springer.com)
  • In the former model, the current sources inside the heart are replaced by potential sources on a surface that encompasses the whole heart (the pericardium). (springer.com)
  • In one embodiment, the mapping system tracks the spread of excitation in the heart, with properties such as propagation velocity changes. (freepatentsonline.com)
  • However, such an examination is necessary to exclude other potential cardiac causes of syncope or cardiac arrest in an otherwise healthy patient (eg, heart murmurs from hypertrophic cardiomyopathy or from a valvular or septal defect). (medscape.com)
  • Message Body (Your Name) thought you would like to see the Heart and Circulatory Physiology web site. (physiology.org)
  • Berry, P.M. "Body surface" potentials produced by the eccentric dipole in the heart wall of the nonhomogeneous volume conductor. (springer.com)
  • Nelson, C.V. Determination of the resultant dipole of the heart from measurements on the body surface. (springer.com)
  • Electroanatomic mapping enables us to get a better perspective of the electrical activation pattern in the failing heart, thereby potentially directing us toward the region of maximal electromechanical delay. (eplabdigest.com)
  • On the device therapy front, electroanatomic mapping facilitates the delineation of the electrical activation pattern of the heart. (eplabdigest.com)
  • First step was to detect all water bodies in Dakar. (plos.org)
  • Secondly, environmental and meteorological conditions in the vicinity of water bodies favoring the presence of Anopheles gambiae s.l. larvae were added. (plos.org)
  • The agency has executed several projects under National mapping missions wherein mapping and inventory of forests, wastelands, land use, surface water-bodies, wetlands, coastal land use, ground-water targets, urban land use etc. have provided the basis for managing these resources to the different ministries and users. (wikipedia.org)
  • Prior to the development of more advanced methods, in 1888 C.B. Nancrede utilized a battery operated bipolar probe in order to map the motor cortex. (wikipedia.org)
  • For human voluntary movement the role of the SMA has been elucidated: Its activity generates the early component of the Bereitschaftspotential (BP) or readiness potential BP1 or BPearly. (wikipedia.org)
  • These components are the Bereitschaftspotential (abbreviated BP, and also known as readiness potential, abbreviated RP) and the Contingent Negative Variation (CNV). (wikipedia.org)
  • The BP is an index of motor preparation and is therefore also referred to as the "readiness potential", as it is the potential for movement to occur. (wikipedia.org)
  • The initial stage of the BP, or readiness potential, is an unconscious intention of, and preparation for movement. (wikipedia.org)
  • For this purpose, analysis of the relationship between the Int-QRST (isointegral) maps distribution and the depressive symptoms intensification, as well interrelation between depressive and diabetic symptoms were performed. (nel.edu)
  • Isointegral QRST maps turned out to display abnormal, i.e. non-dipolar distribution. (nel.edu)
  • Strain mapping was validated, for the first time, as a semi-quantitative method for the assessment of systolic strain, and showed excellent correlation with quantitative strain values. (helsinki.fi)
  • Strain values can be quickly and accurately estimated by the strain-mapping method, validated now for the first time in the assessment of infarct transmurality. (helsinki.fi)
  • Greensite, F., Huiskamp, G.: An improved method for estimating epicardial potentials from the body surface. (springer.com)
  • We have developed a method to obtain body surface potential maps of ICD discharges during implantation surgery and compared these measured potentials with simulated surface potentials to determine simulation accuracy. (utah.edu)
  • The potential usefulness of the method may be improved by increasing the depth of light penetration, confirming its accuracy against other methods evaluating cerebral flow cessation, and developing absolute parameters for cerebral perfusion. (diva-portal.org)
  • In the case of the former method, mind uploading would be achieved by scanning and mapping the salient features of a biological brain, and then by copying, transferring, and storing that information state into a computer system or another computational device. (wikipedia.org)
  • Unlike the traditional Thermofield Dynamics formulations, which maps a finite temperature theory to a zero-temperature one, the method has the advantage of working directly with the physical variables in the finite temperature range and is thus both more natural and compact. (wikipedia.org)
  • A useful spin-off of the method is the combined use of time-dependent coupled cluster method and boson-mapping of stochastic variables to provide a rigorous and systematic cluster expansion method for monitoring quantum dynamics of systems strongly perturbed by colored noise. (wikipedia.org)
  • The 3D transformation parameters can be found on the basis of the corresponding points in the two point clouds, surface matching, and in the case of mobile mapping supported by GNSS and INS, by using the direct sensor orientation method In the point cloud georeferencing process a 3D transformation is computed between the local project coordinate system and a geodetic coordinate system. (wikipedia.org)
  • clarification needed] The essence of the method is mapping of strata based on identification of surfaces which are assumed to represent time lines (e.g. subaerial unconformities, maximum flooding surfaces), and therefore placing stratigraphy in chronostratigraphic framework. (wikipedia.org)
  • When a limb of a salamander or frog was amputated, the voltage at the cut (measured relative to the central part of the body) changed from about -10 mV (millivolts) to +20 mV or more the next day-a phenomenon called the current of injury. (wikipedia.org)
  • Construction of such a development involves numerous access routes for vehicles up to 38 tonnes gross axle weight along tracks overlying open mine voids and the potential for danger to life and limb is paramount. (wikipedia.org)
  • The overall magnitude of the heart's electrical potential is then measured from twelve different angles ("leads") and is recorded over a period of time (usually ten seconds). (wikipedia.org)
  • Popular press reports of earthquake magnitude usually fail to distinguish between magnitude scales, and are often reported as "Richter magnitudes" when the reported magnitude is a moment magnitude (or a surface-wave or body-wave magnitude). (wikipedia.org)
  • Their magnitude was assigned a surface wave magnitude scale (Ms). Gutenberg also combined compressional P-waves and the transverse S-waves (which he termed "body waves") to create a body-wave magnitude scale (mb), measured for periods between 1 and 10 seconds. (wikipedia.org)
  • Ultimately Gutenberg and Richter collaborated to produce a combined scale which was able to estimate the energy released by an earthquake in terms of Gutenberg's surface wave magnitude scale (Ms). The Richter scale, as modified, was successfully applied to characterize localities. (wikipedia.org)
  • This study describes a practical approach for the extraction of diagnostic information from body surface potential maps. (nih.gov)
  • Local depolarization abnormalities are the dominant pathophysiologic mechanism for type 1 electrocardiogram in brugada syndrome a study of electrocardiograms, vectorcardiograms, and body surface potential maps during ajmaline provocation. (medscape.com)
  • In this study a robust operational methodology for entomological malaria predictive risk maps in urban settings is developed. (plos.org)
  • The study of surface gravity of Mars can therefore yield information about different features and provide beneficial information for future landing projects. (wikipedia.org)
  • Researchers at the University of Sydney, Australia cited the study, examining podcasting as a means of supporting instruction, leveraging its advantages against student time constraints and potential bandwidth limitations. (wikipedia.org)
  • Long-lived volcanic systems with changing magma compositions are common on Earth, but an emerging story on Mars," said James Wray, study co-author and associate professor in the School of Earth and Atmospheric Sciences at Georgia Tech. Overall, these findings indicate that Mars is a much more geologically complex body than originally thought, perhaps due to various loading effects on the mantle caused by the weight of giant volcanoes. (wikipedia.org)
  • Such maps for private motor transport were widely used in a 1972 study into airport accessibility in Hampshire, South East England. (wikipedia.org)
  • He has also developed a rigorous finite-temperature non-perturbative field theory to study thermodynamics of strongly interacting many body systems, which is now being applied extensively to study dynamics of vibronic coupling at finite temperature. (wikipedia.org)
  • Mukherjee has developed a rigorous finite - temperature field theory to study Statistical Mechanics of Many-Body systems. (wikipedia.org)
  • Brain mapping is further defined as the study of the anatomy and function of the brain and spinal cord through the use of imaging (including intra-operative, microscopic, endoscopic and multi-modality imaging), immunohistochemistry, molecular & optogenetics, stem cell and cellular biology, engineering (material, electrical and biomedical), neurophysiology and nanotechnology. (wikipedia.org)
  • The former focuses on specific known marker genes and is primarily informative taxonomically, while the latter is an entire metagenomic approach which can also be used to study the functional potential of the community. (wikipedia.org)
  • There are numerous terms that are used to describe the features contained in this study including geo-body, channel complex, channel storey, channel complex set, and confined channel complex system (Kane, 2011). (wikipedia.org)