National Medical Policy
... p = 0.0009) and PR interval (HR 1.3 [1.2-1.4], p < 0.0001) remained significant and together yielded an area under the receiver operating characteristic curve of 0.78 (0.70-0.85). The same predictors were found at 36 months. Increasing age and a prolonged PR interval at enrollment were independently ...
... p = 0.0009) and PR interval (HR 1.3 [1.2-1.4], p < 0.0001) remained significant and together yielded an area under the receiver operating characteristic curve of 0.78 (0.70-0.85). The same predictors were found at 36 months. Increasing age and a prolonged PR interval at enrollment were independently ...
Contractile properties of thermally acclimated trout heart
... tasks in the pumping work of the vertebrate heart, which muscle tissue. Similar differences also existed between the are reflected in their contractile properties. Although atrial tissues of cold-acclimated (CA, 4 °C) and warm-acclimated contraction is assumed to have an important role in the (WA, 1 ...
... tasks in the pumping work of the vertebrate heart, which muscle tissue. Similar differences also existed between the are reflected in their contractile properties. Although atrial tissues of cold-acclimated (CA, 4 °C) and warm-acclimated contraction is assumed to have an important role in the (WA, 1 ...
Influence of Paroxysmal Atrial Fibrillation Attack on Brain Natriuretic
... fraction and maximum oxygen consumption continued to increase for 1 month after the defibrillation10). On the other hand, atrial function recovery takes much longer, from several weeks up to several months11). Study of BNP change after electrical defibrillation in patients with chronic Af found that ...
... fraction and maximum oxygen consumption continued to increase for 1 month after the defibrillation10). On the other hand, atrial function recovery takes much longer, from several weeks up to several months11). Study of BNP change after electrical defibrillation in patients with chronic Af found that ...
Pacemaker Timing - 123SeminarsOnly.com
... the period of time after a ventricular pace or sense when the atrial channel is in refractory. In other words, atrial senses outside of blanking that occur during this period are "seen" (and marked “AR) on the marker channel), but do not initiate an AV interval. The purpose of PVARP is to avoid ...
... the period of time after a ventricular pace or sense when the atrial channel is in refractory. In other words, atrial senses outside of blanking that occur during this period are "seen" (and marked “AR) on the marker channel), but do not initiate an AV interval. The purpose of PVARP is to avoid ...
Chapter 14 Paroxysmal Supraventricular Tachycardias and the
... However, Klein et al. have reported on the natural history of asymptomatic WPW syndrome; they noted a very low incidence of major morbidity and serious symptomatic arrhythmias including atrial fibrillation with rapid antegrade conduction and mortality.14 Supraventricular arrhythmias are seen at all ...
... However, Klein et al. have reported on the natural history of asymptomatic WPW syndrome; they noted a very low incidence of major morbidity and serious symptomatic arrhythmias including atrial fibrillation with rapid antegrade conduction and mortality.14 Supraventricular arrhythmias are seen at all ...
Responses of cardiac natriuretic peptides after paroxysmal
... different results. Further studies are required to elucidate this issue. The mechanisms regulating myocardial production or release of BNP and CNP ...
... different results. Further studies are required to elucidate this issue. The mechanisms regulating myocardial production or release of BNP and CNP ...
The Wavelength of the Cardiac Impulse and Reentrant Arrhythmias
... respectively. The effects of epinephrine (6 X 1CT7 M) were strongly rate dependent. At slow heart rates, epinephrine clearly prolonged the wavelength (58 mm), whereas, during maximum pacing, wavelength remained unchanged (28 mm). Hypokalemia (2 ITIM) decreased the length of the impulse at all stimul ...
... respectively. The effects of epinephrine (6 X 1CT7 M) were strongly rate dependent. At slow heart rates, epinephrine clearly prolonged the wavelength (58 mm), whereas, during maximum pacing, wavelength remained unchanged (28 mm). Hypokalemia (2 ITIM) decreased the length of the impulse at all stimul ...
Chapter 28: Pacemakers and Implantable
... improves septal wall motion, mitral valve function, and the dynamics of LV contraction in patients with severe HF or dilated cardiomyopathy. 7. Pacemaker therapy has been very successful in many patients with atrial ___________________ 8. Other indications for cardiac pacing include hypersensitive c ...
... improves septal wall motion, mitral valve function, and the dynamics of LV contraction in patients with severe HF or dilated cardiomyopathy. 7. Pacemaker therapy has been very successful in many patients with atrial ___________________ 8. Other indications for cardiac pacing include hypersensitive c ...
Atrial Fibrillation Detection
... Atrial fibrillation (AF) is a common arrhythmia with a prevalence of approximately 0.4-1% in the general population. Prevalence increases with age and it is estimated to be present in 5% of those older than 65, and 10% of those older than 70. It is associated with an increased risk of stroke and mor ...
... Atrial fibrillation (AF) is a common arrhythmia with a prevalence of approximately 0.4-1% in the general population. Prevalence increases with age and it is estimated to be present in 5% of those older than 65, and 10% of those older than 70. It is associated with an increased risk of stroke and mor ...
Review Article Heart failure with preserved ejection fraction
... (LA) pressure, the mitral valve opens and the early rapid filling phase begins. The peak early filling velocity is termed “E wave”, which is recorded with the deceleration time (DT) from peak to baseline at the end of the E wave. The LV pressure gradually increases until the LV and LA pressure has e ...
... (LA) pressure, the mitral valve opens and the early rapid filling phase begins. The peak early filling velocity is termed “E wave”, which is recorded with the deceleration time (DT) from peak to baseline at the end of the E wave. The LV pressure gradually increases until the LV and LA pressure has e ...
Guidelines - Lettre de l`UFCV N°58
... against a particular treatment or procedure, and include estimates of expected health outcomes where data exist. Patient-specific modifiers, comorbidities, and issues of patient preference that might influence the choice of particular tests or therapies are considered as well as frequency of follow- ...
... against a particular treatment or procedure, and include estimates of expected health outcomes where data exist. Patient-specific modifiers, comorbidities, and issues of patient preference that might influence the choice of particular tests or therapies are considered as well as frequency of follow- ...
ACC/AHA/ESC 2006 Guidelines for the
... against a particular treatment or procedure, and include estimates of expected health outcomes where data exist. Patient-specific modifiers, comorbidities, and issues of patient preference that might influence the choice of particular tests or therapies are considered as well as frequency of follow- ...
... against a particular treatment or procedure, and include estimates of expected health outcomes where data exist. Patient-specific modifiers, comorbidities, and issues of patient preference that might influence the choice of particular tests or therapies are considered as well as frequency of follow- ...
Relative Contributions of the Atrial Systole
... ventricular function was observed as a result of atrial pacing, sequential atrioventricular pacing, or atrial-His bundle pacing at an appropriate atrial systole-ventricular systole (As-Vs) interval. Ventricular function was depressed during ventricular pacing and during atrioventricular pacing with ...
... ventricular function was observed as a result of atrial pacing, sequential atrioventricular pacing, or atrial-His bundle pacing at an appropriate atrial systole-ventricular systole (As-Vs) interval. Ventricular function was depressed during ventricular pacing and during atrioventricular pacing with ...
DOI: 10.1161/CIRCULATIONAHA.106.177031 published online Aug
... against a particular treatment or procedure, and include estimates of expected health outcomes where data exist. Patient-specific modifiers, comorbidities, and issues of patient preference that might influence the choice of particular tests or therapies are considered as well as frequency of follow- ...
... against a particular treatment or procedure, and include estimates of expected health outcomes where data exist. Patient-specific modifiers, comorbidities, and issues of patient preference that might influence the choice of particular tests or therapies are considered as well as frequency of follow- ...
J Soler-Soler, J Sagristá-Sauleda, A Cabrera, J Sauleda-Parés, J Iglesias-Berengué,... Permanyer-Miralda and J Roca-Llop
... be the drug of choice in the treatment of paroxysmal supraventricular tachycardia (PSVT) in adults. It has been particularly effective in reciprocating junctional tachycardias with6' 8 or without6 8 an associated extranodal pathway. The rapid action of verapamil and its quick elimination contribute ...
... be the drug of choice in the treatment of paroxysmal supraventricular tachycardia (PSVT) in adults. It has been particularly effective in reciprocating junctional tachycardias with6' 8 or without6 8 an associated extranodal pathway. The rapid action of verapamil and its quick elimination contribute ...
European Heart Rhythm Association/Heart Failure Association joint
... The two constantly growing global health problems (that is, HF and AF) often co-exist, or may precipitate one another. Recent registry-based reports show that 40% of patients hospitalized for HF already have a history of AF, up to 50% of patients have AF at baseline, and nearly 20% of patients may ...
... The two constantly growing global health problems (that is, HF and AF) often co-exist, or may precipitate one another. Recent registry-based reports show that 40% of patients hospitalized for HF already have a history of AF, up to 50% of patients have AF at baseline, and nearly 20% of patients may ...
Morphology and Electrophysiology of the Mammalian A trioven
... impulse slowly, thereby causing a delay between activation of atria and ventricles. Because of this so-called AVnodal delay, contraction of atria and ventricles are coordinated. 2) The A V node is capable of blocking impuls es on their way from atria to ventricles, wh en these occur prematurely or a ...
... impulse slowly, thereby causing a delay between activation of atria and ventricles. Because of this so-called AVnodal delay, contraction of atria and ventricles are coordinated. 2) The A V node is capable of blocking impuls es on their way from atria to ventricles, wh en these occur prematurely or a ...
ACC/AHA/ESC Practice Guidelines
... against a particular treatment or procedure, and include estimates of expected health outcomes where data exist. Patient-specific modifiers, comorbidities, and issues of patient preference that might influence the choice of particular tests or therapies are considered as well as frequency of follow- ...
... against a particular treatment or procedure, and include estimates of expected health outcomes where data exist. Patient-specific modifiers, comorbidities, and issues of patient preference that might influence the choice of particular tests or therapies are considered as well as frequency of follow- ...
Cardiac Rhythm Management Devices (Part I)
... almost always occurs at the atrioventricular node.10 When associated with bundle-branch block, there is infra-Hisian block in up to 30% of cases.25 Type II 2° AVHB is most commonly encountered when the QRS is prolonged and is generally localized to within the His-Purkinje system.25 Advanced type II ...
... almost always occurs at the atrioventricular node.10 When associated with bundle-branch block, there is infra-Hisian block in up to 30% of cases.25 Type II 2° AVHB is most commonly encountered when the QRS is prolonged and is generally localized to within the His-Purkinje system.25 Advanced type II ...
Obtaining a High Quality ECG and Basic ECG
... “rabbit ears” in V1. This is a frequent normal variant. ...
... “rabbit ears” in V1. This is a frequent normal variant. ...
Cardiac connexins and impulse propagation
... ECG recordings on homozygous Cx40 KO mice exhibited prolonged P-wave duration [50–52,55,57], which is compatible with the detected reduced right-atrial conduction velocity [52,55]. However, prolongation of the P-wave was not a common finding, as in other studies, a P-wave prolongation was not found [ ...
... ECG recordings on homozygous Cx40 KO mice exhibited prolonged P-wave duration [50–52,55,57], which is compatible with the detected reduced right-atrial conduction velocity [52,55]. However, prolongation of the P-wave was not a common finding, as in other studies, a P-wave prolongation was not found [ ...
Experiment HH-2: The Electrocardiogram and Heart Sounds
... 1. Disconnect the lead wires from the wrists and ankle of the first subject. 2. Place new ECG electrodes on another subject. Record the ECG from the second subject, as described in Exercise 1. 3. Repeat this exercise on additional subjects, within the time limits of the lab period. At the beginning ...
... 1. Disconnect the lead wires from the wrists and ankle of the first subject. 2. Place new ECG electrodes on another subject. Record the ECG from the second subject, as described in Exercise 1. 3. Repeat this exercise on additional subjects, within the time limits of the lab period. At the beginning ...
Hyperhomocysteinemia alters sinoatrial and atrioventricular nodal
... remodelling in patients with HHcy. Changes in NMDA receptor subunit expression can have a profound effect on normal impulse propagation, but more importantly on signal conduction between atria and ventricles across the A VN. The overall hypothesis of this dissertation was arrhythmogenesis may arise ...
... remodelling in patients with HHcy. Changes in NMDA receptor subunit expression can have a profound effect on normal impulse propagation, but more importantly on signal conduction between atria and ventricles across the A VN. The overall hypothesis of this dissertation was arrhythmogenesis may arise ...
Temporary Pacing power point education
... • Undersensing: pacer not sensing all intrinsic activity so may misfire at inappropriate times • Oversensing: pacer sensing artifact as well as intrinsic activity so may not fire when necessary ...
... • Undersensing: pacer not sensing all intrinsic activity so may misfire at inappropriate times • Oversensing: pacer sensing artifact as well as intrinsic activity so may not fire when necessary ...
atrioventricular nodal rhythms
... The escape-capture bigeminy is unusual in that it consists of the escape of a lower AV nodal pacemaker followed by a ventricular capture which is effected by an upper AV nodal pacemaker. Most cases of escape-capture bigeminy are due to capture by sinus impulses. The rhythm is possible because of an ...
... The escape-capture bigeminy is unusual in that it consists of the escape of a lower AV nodal pacemaker followed by a ventricular capture which is effected by an upper AV nodal pacemaker. Most cases of escape-capture bigeminy are due to capture by sinus impulses. The rhythm is possible because of an ...
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.