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. 2024 Oct 16;16:1623–1636. doi: 10.2147/NSS.S480687

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© 2024 Kabir et al.

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Effect of the participants’ history of cardiovascular disease (CVD) on the changes in heart sound intensities HSI_S1 (A) and HSI_S2 (B) with hypoxemia (N = 16). A trend of larger increase in HSI_S2 from pre-termination to post-termination event was observed in participants with previous history of cardiovascular disorder (CVD) compared to those with no known history.