Department of Pediatrics, Akita University Graduate School of Medicine, 1-1-1, Hondo, Akita 010-8543, Japan.
Department of Cell Physiology, Akita University Graduate School of Medicine, 1-1-1, Hondo, Akita 010-8543, Japan.
Sensors (Basel). 2021 Feb 16;21(4):1376. doi: 10.3390/s21041376.
This study aimed to evaluate the capability of a piezoelectric sensor to detect a heart murmur in patients with congenital heart defects. Heart sounds and murmurs were recorded using a piezoelectric sensor and an electronic stethoscope in healthy neonates (n = 9) and in neonates with systolic murmurs caused by congenital heart defects (n = 9) who were born at a hospital. Signal data were digitally filtered by high-pass filtering, and the envelope of the processed signals was calculated. The amplitudes of systolic murmurs were evaluated using the signal-to-noise ratio and compared between healthy neonates and those with congenital heart defects. In addition, the correlation between the amplitudes of systolic murmurs recorded by the piezoelectric sensor and electronic stethoscope was determined. The amplitudes of systolic murmurs detected by the piezoelectric sensor were significantly higher in neonates with congenital heart defects than in healthy neonates ( < 0.01). Systolic murmurs recorded by the piezoelectric sensor had a strong correlation with those recorded by the electronic stethoscope (ρ = 0.899 and < 0.01, respectively). The piezoelectric sensor can detect heart murmurs objectively. Mechanical improvement and automatic analysis algorithms are expected to improve recording in the future.
本研究旨在评估压电传感器检测先天性心脏病患者心杂音的能力。使用压电传感器和电子听诊器在健康新生儿（n=9）和因先天性心脏病导致收缩期杂音的新生儿（n=9）中记录心音和杂音。通过高通滤波对信号数据进行数字滤波，并计算处理信号的包络。使用信噪比评估收缩期杂音的幅度，并在健康新生儿和先天性心脏病新生儿之间进行比较。此外，还确定了压电传感器记录的收缩期杂音幅度与电子听诊器记录的幅度之间的相关性。患有先天性心脏病的新生儿的收缩期杂音幅度明显高于健康新生儿（<0.01）。压电传感器记录的收缩期杂音与电子听诊器记录的收缩期杂音具有很强的相关性（ρ=0.899 和 <0.01）。压电传感器可以客观地检测心杂音。预计机械改进和自动分析算法将改善未来的记录。
