[Rhythm and conduction disorders among the adult population. Epidemiologic data].

2.487 resting ECG were examined which is 61.3% of randomly chosen group of inhabitants of Cracow, aged from 20 to 93. There were: sinus tachycardia (HR 100)--4.2%, extrasystole--2.7%, fibrillatio atriorum 1.4%, blocks A-VI0--0.9%, intraventricular conduction defects--3.6% (most often LAH). Prevalence of disturbances of rhythm and conduction increases with age, mainly after 60.