[Relation between intra-atrial conduction and disorders of sinoatrial, atrioventricular and intraventricular conduction (according to selectively intensified ECG findings)].

The differentially intensified ECG was recorded from the chest surface to determine the intraatrial conductivity in patients with chronic coronary heart disease. The parameters of the differentially intensified ECG were compared with the indices of intraatrial conductivity on the intracavitary electrogram. Disorders of intraatrial conductivity were also compared with impairments of conductivity in other sites of the conductivity system of the heart. A total of 154 patients with chronic coronary heart disease (aged 38 to 77 years) and with disorders of conductivity in various sites of the heart were examined. Intraatrial conductivity disorders were detected in 77.8% of patients with the syndrome of pacemaker weakness, in 46.5% of patients with atrioventricular block of degree II and III and in 82.1% of patients with block of the peduncles of His's bundle.