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Phonometric study of the human first heart sound
Japanese Heart Journal
|September 1, 1982
Summary
This study analyzed the frequency distribution of the first heart sound in healthy individuals using phonocardiogram (PCG) recordings. Findings establish a spectral standard for the first heart sound, crucial for diagnosing cardiac conditions.
Area of Science:
- Cardiology
- Biomedical Engineering
- Acoustics
Background:
- The first heart sound provides vital diagnostic information.
- Characterizing its acoustic properties is essential for understanding cardiac function.
Purpose of the Study:
- To analyze the frequency distribution of the first heart sound in normal subjects.
- To establish a spectral standard for the first heart sound for future research.
Main Methods:
- Phonocardiogram (PCG) recordings were obtained from 20 normal subjects.
- Signals were analyzed using Fast Fourier Transform (FFT) after digital conversion.
- Both linear (Sound Pressure Level - SPL) and filtered (American National Standard Institute - ANSI filter B) recordings were analyzed.
Main Results:
- SPL spectra showed peak intensity around 12-20 Hz (approx. 80 dB), decreasing to 35 dB by 110-120 Hz.
- ANSI filter B spectra showed peak intensity of 40-50 dB between 20-60 Hz.
- SPL recordings were deemed more valuable for comprehensive PCG signal analysis.
Conclusions:
- Established spectral characteristics of the first heart sound in healthy individuals.
- SPL recordings offer a more complete analysis of the first heart sound's acoustic components.
- These spectral data serve as a baseline for investigating pathological conditions.