THE USE OF HIGH-RESOLUTION ELECTROCARDIOG RAPHY FOR ANALYSIS OF THE P-WAVE OF THE ELECTROCARDIOGRAM

The aim of the study was to elucidate the ability of high-resolution e lectrocardiography to diagnose pathologic changes of atrial electrical activity. Four groups of patients were studied: 90 patients with acut e respiratory failure, 46 patients with attacks of paroxismal atrial f ibrillation, 42 patients with rheumatic mitral valve disease, and 29 p atients before and after coronary or valve surgery. It was shown that analysis of the P-wave with the use of high-resolution electrocardiogr aphy allowed to obtain important diagnostic information on the distrib ution of exitation and electrophysiologic properties of atrial myocard ium. Changes of values of power spectral density, low- and high-freque ncy components, amplitude and temporal characteristics of frequency pe aks were observed. It was found that antiarrythmic drugs affect some p arameters of high-resolution ECG in patients subjected to mital valve replacement or aorto-coronary bypass.