Key result
Bed-based unconstrained cardiac auscultation achieves a ~0.75 correlation with reference stethoscopes for measuring heart sounds.
Why the study?
A method to obtain heart sounds unconstrained by contact and through a bed mattress was needed to improve cardiac auscultation while lying on a bed.
Does a bed-based unconstrained cardiac auscultation method accurately measure heart sounds compared to a standard stethoscope?
Does a bed-based unconstrained cardiac auscultation method accurately measure heart sounds compared to a standard stethoscope?
Effect estimate: correlation coefficient of 0.75 ± 0.12
A novel bed-based unconstrained cardiac auscultation device can measure heart sounds with moderate correlation to a standard stethoscope.
May support unconstrained monitoring in select settings; leaves open prospective validation before clinical use.
In this letter, we propose a bed-based unconstrained cardiac auscultation method to obtain heart sounds while a person is lying on a bed. In the proposed method, a sensing device with a resonance frequency in the frequency range of heart sounds is designed to improve the decreased gain of heart sounds through propagation in the bed mattress. In addition, the Wiener filter is applied to reduce the noise component contained in the measurement signals obtained by the proposed device. We performed a validation experiment to evaluate whether the proposed method correctly measures heart sounds by comparing the reference heart sounds measured by a stethoscope and those by the proposed device under a combination of conditions with different bed mattress thicknesses, sleeping postures, and respiratory states. The accuracy is evaluated by the correlation coefficient of the spectrum of heart sounds between the proposed method and the stethoscope. The experimental results demonstrate that the proposed unconstrained cardiac auscultation method can measure heart sounds with a correlation coefficient of 0.75 ± 0.12 on average.
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Nishio et al. (2021) studied this question. Bed-based unconstrained cardiac auscultation method vs. Stethoscope was evaluated on Correlation coefficient of the spectrum of heart sounds between the proposed method and the stethoscope (correlation coefficient of 0.75 ± 0.12). The proposed bed-based unconstrained cardiac auscultation method measured heart sounds with an average correlation coefficient of 0.75 ± 0.12 compared to a reference stethoscope.
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