[Heart rate and QT-interval dispersion with consideration of left ventricular geometry in a population study of men and women aged 35-59 years].

Interrelationships between heart rate (HR), parameters of QT interval dispersion on resting ECG and four variants of echocardiographically defined left ventricular geometry were elucidated in 723 participants of a population study of inhabitants of Tallinn aged 35-59 years. Examination included anthropometry, blood pressure (BP) measurement, registration of ECG and echocardiography. None of normotensive examinees had concentric left ventricular hypertrophy.

Antiarrhythmic efficacy of ethacizine assessed by programmed electrical stimulation in patients with ventricular tachycardia.

The efficacy of ethacizine, a Class Ic drug, was assessed by programmed electrical stimulation (PES), delivering single, double, and triple extrastimuli at paced drives of 100 and 140 beats/min from two right ventricular sites (apex and outflow tract) in 38 patients with recurrent sustained ventricular tachycardia (VT). Underlying disease was coronary artery disease (CAD) in 26 (group I) and other conditions in 12 patients (group II; hypertrophic cardiomyopathy in 7, mitral valve prolapse in 1, and no apparent heart disease in 4). In the baseline study VT was induced in all patients.