On body-surface electrocardiography the duration of the QT interval depends also of an additional factor: the spatial three-dimensional projection of the electrical waves vectors, which makes any determination of the epicardial dispersion by measuring QT interval dispersion questionable. (b) The enhanced...
This review focuses on the molecular determinants of the duration of the QT interval as measured on by electrocardiography in normal subjects and during cardiac hypertrophy and failure. (a) In control conditions, on a single cell, the shape and duration of the action potential is the result of...
QTc measured in rest ECG was 610 ms and maladaptation of the QT interval duration to the changing heart rate was documented. 24-hour ECG did not show significant arrhythmias. Both echocardiogram and magnetic resonance confirmed structurally normal heart. Electrophysiological study ruled out WPW ...
Risk assessment should consider age–gender interactions, prior syncopal history, QT-interval duration, and genetic factors. Beta-blockers constitute the mainstay therapy for LQTS, while left cardiac sympathetic denervation and implantation of a cardioverter defibrillator should be considered in patients ...
A survey of current literature suggests an increasing interest in both the desirable and undesirable implications of a prolonged QT interval, the former perceived to be the beneficial effect of antiarrhythmic drugs that prolong the duration of ventricular action potential, and the latter considered to ...
The influence of asthma on risk of cardiac events (syncope, aborted cardiac arrest, or LQTS death) was evaluated after accounting for age, gender, QTc, and RR interval duration, β-blocker and β-mimetic use. Asthma was identified in 226 (5.2%) of 4,310 studied LQTS family members. ...
Risk assessment should consider age鈥揼ender interactions, prior syncopal history, QT-interval duration, and genetic factors. Beta-blockers constitute the mainstay therapy for LQTS, while left cardiac sympathetic denervation and implantation of a cardioverter defibrillator should be considered in patients...
QT interval variability and cardiac norepinephrine spillover in patients with depression and panic disorder Suggestions were made that increased myocardial sympathetic activity is reflected by elevated QT variability (dynamic changes in QT interval duration). How... M Baumert,GW Lambert,T Dawood,... ...
The study investigated interobserver and intrasubject reproducibility of QT interval duration and dispersion measured in standard 12-lead ECGs recorded at 25 mm/sec. Twenty-eight healthy volunteers were studied. Each undenvent four ECG recordings, which were performed 1, 7, and 30 days apart. Two...
Ignacio Ferna´ndez-Lozano7, Lluı´ s Mont3, Josep Brugada3, Fabiana S Scornik1,2 and Ramon Brugada*,1,2 The heritable cardiovascular disorder long QT syndrome (LQTS), characterized by prolongation of the QT interval on electrocardiogram, carries a high risk of sudden cardiac death. ...