[State of the atrial myocardium in patients with paroxysmal form of fibrillation arrhythmia].

Seven two patients with coronary heart disease complicated with paroxysmal atrial fibrillation were studied by using accelerated atrial vector cardiography and M-mode echocardiography. Vector cardiography made it possible to reveal the signs of left atrial hyperfunction with normal left atrial echocardiographic dimensions. There were lower values for left ventricular myocardial contractility in parallel with higher echocardiographic dimensions of the left atrium. In the patients examined, progression of cardiosclerosis was accompanied by decreased amplitude values for the P loop on the vector cardiogram strip along with slower intraatrial conduction with an increase in the size of the left atrial cavity.