K.S. Komarov1, Z. M. Yuldashev2

1, 2 St. Petersburg Electrotechnical University "LETI" (St. Petersburg, Russia)
1kok0lord@ya.ru, 2yuld@mail.ru

The study of heart sounds by auscultation often leads to an incorrect interpretation of pathological disorders due to the low acoustic intensity of heart sounds, the effect on the effectiveness of detecting cardiac disorders of endogenous and exogenous origin, the individual hearing characteristics of a cardiologist, and his skill level. Due to the widespread introduction and use of information technology achievements in medicine, prerequisites have been created today for objectifying the diagnostic process through synchronous recording, using mathematical processing methods and analyzing synchronous recordings of electro- and phonocardiographic signals, and quantifying diagnostically significant phonocardiographic signal indicators for various stages of heart function. The identification of specific heart sounds for the stages of systole and diastole, closure of atrial and ventricular valves in order to quantify significant indicators requires knowledge of the technical characteristics of the hardware and software complex being developed to solve these tasks. The purpose of the work. Development of technical requirements for a hardware and software complex for synchronous recording of electro- and phonocardiographic signals, quantitative assessment of heart sounds based on digital signal processing and analysis methods. Results. A review of the studies performed to establish the acoustic parameters of heart tones is carried out. Based on these data, a certified acoustic sensor, a condenser microphone, has been selected with a suitable frequency range and sensitivity level for recording heart sounds. The amplitude-frequency characteristic of the microphone and its preamp is obtained, on the basis of which it is established that its linearity in the frequency range of heart tones allows transmitting the signal without distortion. Practical significance. The device being developed for performing digital auscultation allows recording two electro- and phonocardiographic signals with high sensitivity, which, with subsequent software processing, will allow objectifying the analysis of cardiac disorders in the frequency range from 20 Hz and above.

Komarov K.S., Yuldashev Z.M. The device for simultaneous recording of PCG & ECG for their quantitive evaluation. Biomedicine Radioengineering. 2025. V. 28. № 5. P. 187–191. DOI: https:// doi.org/10.18127/ j15604136-202505-36 (In Russian)

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