Annals of noninvasive electrocardiology : the official journal of the International Society for Holter and Noninvasive Electrocardiology, Inc
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Ann Noninvasive Electrocardiol · Jul 2005
Inter- and intraobserver variability in LVH and RVH reporting in pediatric ECGs.
Physicians' diagnoses are often used as the gold standard for evaluating computer electrocardiogram (ECG) interpretation programs. As part of a larger study to evaluate the Glasgow pediatric ECG analysis program, inter- and intraobserver variability in the ECG reporting of two pediatric cardiologists was examined. ⋯ This study has demonstrated the difficulties in using cardiologists' diagnoses as the gold standard with which to evaluate pediatric ECGs.
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Ann Noninvasive Electrocardiol · Jul 2005
Comparative StudyCigarette smoking and heart rate variability: dynamic influence of parasympathetic and sympathetic maneuvers.
Cigarette smoking has been associated with increased activity of the sympathetic nervous system. In this study, we investigated cardiac autonomic function in heavy smokers and nonsmoker controls by analysis of heart rate variability (HRV). ⋯ Vagal modulation of the heart is blunted in heavy smokers, particularly during a parasympathetic maneuver. Blunted autonomic control of the heart may partly be associated with adverse event attributed to cigarette smoking.
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Ann Noninvasive Electrocardiol · Apr 2005
Comparative StudyComparison of the four formulas of adjusting QT interval for the heart rate in the middle-aged healthy Turkish men.
The aim of this study was to evaluate the QT intervals at different rest heart rates in healthy middle-aged Turkish men and to compare the known four QT adjusting methods for heart rate. ⋯ Among four QT correction formulas, the nomogram method provides the most accurately adjusted values of QT interval for all the heart rates in healthy men. Bazett's formula fails to adjust the QT interval for all the heart rates.
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Ann Noninvasive Electrocardiol · Apr 2005
Electrocardiographic follow-up of biventricular pacemakers.
Multisite pacing for the treatment of heart failure has added a new dimension to the electrocardiographic evaluation of device function. During left ventricular (LV) pacing from the appropriate site in the coronary venous system, a correctly positioned lead V1 registers a right bundle branch block pattern with few exceptions. During biventricular stimulation associated with right ventricular (RV) apical pacing, the QRS is often positive in lead V1. ⋯ This may be caused by a variety of events (especially ventricular premature complexes and favored by the presence of first-degree AV block) that alter the timing of sensed and paced events. In such cases, atrial events become trapped into the postventricular atrial refractory period at atrial rates below the programmed upper rate in the presence of spontaneous AV conduction. Algorithms are available to restore resynchronization by automatic temporary abbreviation of the postventricular atrial refractory period.