A dynamical model for generating synthetic electrocardiogram signals
... In order to illustrate the dynamics of the RR-intervals obtained from this synthetic ECG, peak detection was used to identify the times of the R-peaks. In the noise-free case, a simple algorithm which looks for local maxima within a small window is sufficient. For ECGs with noise and artefacts it ma ...
... In order to illustrate the dynamics of the RR-intervals obtained from this synthetic ECG, peak detection was used to identify the times of the R-peaks. In the noise-free case, a simple algorithm which looks for local maxima within a small window is sufficient. For ECGs with noise and artefacts it ma ...
Recommendations for chamber quantification
... (MI), atrial fibrillation etc. In addition, much of the risk literature applies to specific populations (postMI, elderly), and not general cardiovascular risk readily applicable to consecutive patients studied in an echocardiography laboratory. Lastly, although having data specifically related to ri ...
... (MI), atrial fibrillation etc. In addition, much of the risk literature applies to specific populations (postMI, elderly), and not general cardiovascular risk readily applicable to consecutive patients studied in an echocardiography laboratory. Lastly, although having data specifically related to ri ...
Impact of Atrioventricular Compliance on Pulmonary Artery Pressure
... was closely related to PAP, particularly during exercise. The primary reason for this finding is that low atrial compliance will become evident first during exercise, as left atrial pressure and PAP rise significantly in response to increases in heart rate and flow. At a later stage, particularly wh ...
... was closely related to PAP, particularly during exercise. The primary reason for this finding is that low atrial compliance will become evident first during exercise, as left atrial pressure and PAP rise significantly in response to increases in heart rate and flow. At a later stage, particularly wh ...
Review Treatment of tachyarrhythmias during pregnancy and lactation
... Experience with its use in pregnancy and lactation is too limited to grant any recommendation regarding its use[6]. In general, as in non-pregnant patients, caution must be exercised with this class of drugs because excessive QT prolongation may cause torsade de pointes[28]; thus, QT duration should ...
... Experience with its use in pregnancy and lactation is too limited to grant any recommendation regarding its use[6]. In general, as in non-pregnant patients, caution must be exercised with this class of drugs because excessive QT prolongation may cause torsade de pointes[28]; thus, QT duration should ...
The DAVID (Dual Chamber and VVI Implantable Defibrillator) II Trial
... (3). Although not required for most defibrillator patients, addressing the most suitable modality when pacing is desired is important because it potentially affects the future design and application of such therapies in this population (4), particularly among those who are not candidates for biventr ...
... (3). Although not required for most defibrillator patients, addressing the most suitable modality when pacing is desired is important because it potentially affects the future design and application of such therapies in this population (4), particularly among those who are not candidates for biventr ...
outline
... adjacent regions of polarized and depolarized tissue, the vectors are summed by placing the tail of second vector at head of first (and of the third on the second) until all vectors are represented. Then connect tail of first vector to head of last vector to derive the "net vector" - labeled Ptot in ...
... adjacent regions of polarized and depolarized tissue, the vectors are summed by placing the tail of second vector at head of first (and of the third on the second) until all vectors are represented. Then connect tail of first vector to head of last vector to derive the "net vector" - labeled Ptot in ...
3D anatomical modelling of the human cardiac conduction system
... Figure 1.1. Anatomical location of sinus node. ........................................................ 19 Figure 1.2. Histology and immunohistochemistry for Cx43 of human sinus node and surrounding tissue. ............................................................................................. ...
... Figure 1.1. Anatomical location of sinus node. ........................................................ 19 Figure 1.2. Histology and immunohistochemistry for Cx43 of human sinus node and surrounding tissue. ............................................................................................. ...
Mean 24 hour heart rate, minimal heart rate and pauses
... Ambulatory ECG recordings were obtained by 2-channel 24 h portable ECG tape recorders (Oxford Medilog), while the subjects followed their normal daily routines. The tapes were analysed using a semi-automatic arrhythmia analyser (Reynolds Pathfinder). The overall accuracy for QRS complex detection by ...
... Ambulatory ECG recordings were obtained by 2-channel 24 h portable ECG tape recorders (Oxford Medilog), while the subjects followed their normal daily routines. The tapes were analysed using a semi-automatic arrhythmia analyser (Reynolds Pathfinder). The overall accuracy for QRS complex detection by ...
Heart rhythms - British Heart Foundation
... caused by an abnormality in that electrical conduction system, and can make your heart beat too slowly, too quickly, or in an irregular way. Some arrhythmias are more serious than others. There are many reasons why a person may develop an arrhythmia. For example, they are more common in older people ...
... caused by an abnormality in that electrical conduction system, and can make your heart beat too slowly, too quickly, or in an irregular way. Some arrhythmias are more serious than others. There are many reasons why a person may develop an arrhythmia. For example, they are more common in older people ...
Human Identification Using QT Signal and QRS Complex of the ECG
... analyzing only the candidate beats by using DBNN an identification rate of 100% was achieved. The problem associated with this work is that the standard MIT-BIH database was used where each normal person has one record where parts from it was used for learning and other parts were used for testing, ...
... analyzing only the candidate beats by using DBNN an identification rate of 100% was achieved. The problem associated with this work is that the standard MIT-BIH database was used where each normal person has one record where parts from it was used for learning and other parts were used for testing, ...
Potential effects of intrinsic heart pacemaker cell mechanisms on
... arrhythmia. Two regimes of heart rate variability (HRV) are analyzed in patients with arrhythmogenic events: during the events when the entropy of the system increases (Costa et al., 2008), and before the occurrence of arrhythmia. The occurrence of major arrhythmic events in patients with right vent ...
... arrhythmia. Two regimes of heart rate variability (HRV) are analyzed in patients with arrhythmogenic events: during the events when the entropy of the system increases (Costa et al., 2008), and before the occurrence of arrhythmia. The occurrence of major arrhythmic events in patients with right vent ...
No Slide Title
... • Deviation from NSR – No organized atrial depolarization, so no normal P waves (impulses are not originating from the sinus node). – Atrial activity is chaotic (resulting in an irregularly irregular rate). – Common, affects 2-4%, up to 5-10% if > 80 years old ...
... • Deviation from NSR – No organized atrial depolarization, so no normal P waves (impulses are not originating from the sinus node). – Atrial activity is chaotic (resulting in an irregularly irregular rate). – Common, affects 2-4%, up to 5-10% if > 80 years old ...
ACUPUNCTURE AND ARRHYTHMIAS AND HEART FAILURE
... including atrial fibrillation, and heart failure. There are related fact sheets on hypertension, stroke, and coronary heart disease. There is one systematic review to date of randomised controlled trials (RCTs) on acupuncture for arrhythmias (Kim 2011). In the 10 included studies, acupuncture was fo ...
... including atrial fibrillation, and heart failure. There are related fact sheets on hypertension, stroke, and coronary heart disease. There is one systematic review to date of randomised controlled trials (RCTs) on acupuncture for arrhythmias (Kim 2011). In the 10 included studies, acupuncture was fo ...
Atrial Fibrillation in Cardiac Surgery
... In the human myocardium, the conduction system consists of specialized cells capable of electrical impulse formation and conduction. The electrical impulses are created by alterations of ion channels in the cellular membrane, causing regular de- and repolarizations with different frequencies. The st ...
... In the human myocardium, the conduction system consists of specialized cells capable of electrical impulse formation and conduction. The electrical impulses are created by alterations of ion channels in the cellular membrane, causing regular de- and repolarizations with different frequencies. The st ...
Wide-QRS-Complex Tachycardia with a Negative Concordance
... electrograms recorded from the right atrium (RA), His bundle (HISp) proximal and distal (HISd), proximal (CS 9-10) to distal (CS 1-2) coronary sinus, and right ventricle (RV). The cycle length of the two tachycardias is identical (338 ms), a His bundle electrogram precedes every QRS complex with nor ...
... electrograms recorded from the right atrium (RA), His bundle (HISp) proximal and distal (HISd), proximal (CS 9-10) to distal (CS 1-2) coronary sinus, and right ventricle (RV). The cycle length of the two tachycardias is identical (338 ms), a His bundle electrogram precedes every QRS complex with nor ...
Mahaim fibre
... The EP property of the Mahaim fibre is characterized by decremental antegrade conduction over the accessory pathway.3,4,6,10 All our patients had EP properties consistent with Mahaim fibre conduction. There are several reports on ablation of Mahaim accessory pathway with a high success rate.4,7,12–19 ...
... The EP property of the Mahaim fibre is characterized by decremental antegrade conduction over the accessory pathway.3,4,6,10 All our patients had EP properties consistent with Mahaim fibre conduction. There are several reports on ablation of Mahaim accessory pathway with a high success rate.4,7,12–19 ...
Ventricular myocarditis coincides with atrial myocarditis - UvA-DARE
... sudden cardiac death, and indeed myocarditis is a commonly found underlying cause of sudden cardiac death, especially in younger patients.10,11 In addition, AF can result in the development and enhancement of heart failure.12 There is strong evidence linking both systemic and local inflamma ...
... sudden cardiac death, and indeed myocarditis is a commonly found underlying cause of sudden cardiac death, especially in younger patients.10,11 In addition, AF can result in the development and enhancement of heart failure.12 There is strong evidence linking both systemic and local inflamma ...
WPW and Preexcitation Syndromes
... most common arrhythmia, accounting for 95% of re-entrant tachycardias. It has been estimated that one-third of patients with WPW syndrome have atrial fibrillation (AF). AF is a potentially life-threatening arrhythmia. If an accessory pathway has a short anterograde refractory period, then rapid repe ...
... most common arrhythmia, accounting for 95% of re-entrant tachycardias. It has been estimated that one-third of patients with WPW syndrome have atrial fibrillation (AF). AF is a potentially life-threatening arrhythmia. If an accessory pathway has a short anterograde refractory period, then rapid repe ...
Dual atrioventricular nodal non-re
... demonstrated to mimic more common arrhythmias such as atrial premature beats, atrial fibrillation, and ventricular tachycardia. This is important, since mistaken differential diagnoses and the resulting therapeutic decisions have severe consequences for affected patients. DAVNNT is characterized by ...
... demonstrated to mimic more common arrhythmias such as atrial premature beats, atrial fibrillation, and ventricular tachycardia. This is important, since mistaken differential diagnoses and the resulting therapeutic decisions have severe consequences for affected patients. DAVNNT is characterized by ...
ECG Interpretation and Clinical Significance
... same; sometimes, however, the rates may be different due to conditions occurring in the myocardium. It is important to note if the atrial rate is different from the ventricular rate since this will help narrow the selection of dysrhythmias. The methods used to differentiate the rates are described i ...
... same; sometimes, however, the rates may be different due to conditions occurring in the myocardium. It is important to note if the atrial rate is different from the ventricular rate since this will help narrow the selection of dysrhythmias. The methods used to differentiate the rates are described i ...
Myosin Types and Fiber Types II. Atrial Myocardium in Cardiac Muscle.
... (anti-bAm) and the left ventricular myocardium (anti-bVm) of the bovine heart. Cross-reactive antibodies were removed by cross-absorption. Absorbed anti-bAm and anti-bVm were specific for the myosin heavy chains when tested by enzyme immunoassay combined with SDS gel electrophoresis. Indirect immuno ...
... (anti-bAm) and the left ventricular myocardium (anti-bVm) of the bovine heart. Cross-reactive antibodies were removed by cross-absorption. Absorbed anti-bAm and anti-bVm were specific for the myosin heavy chains when tested by enzyme immunoassay combined with SDS gel electrophoresis. Indirect immuno ...
2015 Slide Set - American College of Cardiology
... Management of Patients with Supraventricular Arrhythmias” • Addresses regular as well as irregular SVT (such as atrial flutter with irregular ventricular response and multifocal atrial tachycardia) but does not include atrial fibrillation • Aimed at the adult population (>18 years of age) and gives ...
... Management of Patients with Supraventricular Arrhythmias” • Addresses regular as well as irregular SVT (such as atrial flutter with irregular ventricular response and multifocal atrial tachycardia) but does not include atrial fibrillation • Aimed at the adult population (>18 years of age) and gives ...
Hemodynamic Waveforms
... Arterial lines have much higher pressures than pulmonary artery lines Pulmonary artery tracings are subject to considerable movement artifact not seen in arterial tracings. ...
... Arterial lines have much higher pressures than pulmonary artery lines Pulmonary artery tracings are subject to considerable movement artifact not seen in arterial tracings. ...
Myosin Types and Fiber Types II. Atrial Myocardium
... (anti-bAm) and the left ventricular myocardium (anti-bVm) of the bovine heart. Cross-reactive antibodies were removed by cross-absorption. Absorbed anti-bAm and anti-bVm were specific for the myosin heavy chains when tested by enzyme immunoassay combined with SDS gel electrophoresis. Indirect immuno ...
... (anti-bAm) and the left ventricular myocardium (anti-bVm) of the bovine heart. Cross-reactive antibodies were removed by cross-absorption. Absorbed anti-bAm and anti-bVm were specific for the myosin heavy chains when tested by enzyme immunoassay combined with SDS gel electrophoresis. Indirect immuno ...
Atrial fibrillation
Atrial fibrillation (AF or A-fib) is an abnormal heart rhythm characterized by rapid and irregular beating. Often it starts as brief periods of abnormal beating which become longer and possibly constant over time. Most episodes have no symptoms. Occasionally there may be heart palpitations, fainting, shortness of breath, or chest pain. The disease increases the risk of heart failure, dementia, and stroke.Hypertension and valvular heart disease are the most common alterable risk factors for AF. Other heart-related risk factors include heart failure, coronary artery disease, cardiomyopathy, and congenital heart disease. In the developing world valvular heart disease often occurs as a result of rheumatic fever. Lung-related risk factors include COPD, obesity, and sleep apnea. Other factors include excess alcohol intake, diabetes mellitus, and thyrotoxicosis. However, half of cases are not associated with one of these risks. A diagnosis is made by feeling the pulse and may be confirmed using an electrocardiogram (ECG). The typical ECG shows no P waves and an irregular ventricular rate.AF is often treated with medications to slow the heart rate to a near normal range (known as rate control) or to convert the rhythm to normal sinus rhythm (known as rhythm control). Electrical cardioversion can also be used to convert AF to a normal sinus rhythm and is often used emergently if the person is unstable. Ablation may prevent recurrence in some people. Depending on the risk of stroke either aspirin or anti-clotting medications such as warfarin or a novel oral anticoagulant may be recommended. While these medications reduce this risk, they increase rates of major bleeding.Atrial fibrillation is the most common serious abnormal heart rhythm. In Europe and North America, as of 2014, it affects about 2% to 3% of the population. This is an increase from 0.4 to 1% of the population around 2005. In the developing world about 0.6% of males and 0.4% of females are affected. The percentage of people with AF increases with age with 0.14% under 50 years old, 4% between 60 and 70 years old, and 14% over 80 years old being affected. A-fib and atrial flutter resulted in 112,000 deaths in 2013, up from 29,000 in 1990. The first known report of an irregular pulse was by John Baptist Senac in 1749. This was first documented by ECG in 1909 by Thomas Lewis.