title: [Spectrum analysis of heart sounds in chronic coronary insufficiency].
abstract: Major heart tone amplitude-frequency characteristics were studied in relation to central hemodynamics and physical stress tolerance in 147 chronic coronary patients. A method of spectrogram assessment is proposed that includes the measurement of spectrum width, resonance frequency and the Q-factor. Amplitude-frequency studies demonstrated limited left-ventricular vibration capacity with reduced myocardial contractility and increased myocardial weight. The results of bicycle ergometry were correlated with heart tone spectrum data. A relationship was demonstrated between changes in major parameters of tone 1 and the double product, threshold capacity for exercise and the output.
mesh_terms: D000328:Adult; D000368:Aged; D002908:Chronic Disease; D003327:Coronary Disease / Q000175:diagnosis* / Q000503:physiopathology; D005260:Female; D006326:Heart Auscultation; D006347:Heart Sounds; D006801:Humans; D008297:Male; D008875:Middle Aged; D009200:Myocardial Contraction; D013057:Spectrum Analysis
vernacular_title: Spektral'nyĭ analiz tonov serdtsa pri khronicheskoĭ koronarnoĭ nedostatochnosti.