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Noninvasive Blood Pressure and the Second Heart Sound Analysis

Castro, A. C. ; Mattos, S. S. ; Coimbra, M.

Noninvasive Blood Pressure and the Second Heart Sound Analysis, Proc Portuguese Conf. on Pattern Recognition - RecPad, Covilhã, Portugal, Vol. NA, pp. NA - NA, October, 2014.

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Auscultations acquired from children patients (27 patients, 10.23.9 years, 35.720.8 kg, 132.325.5 cm), were automatically segmented into their components first (S1) and second (S2) heart sounds. A set of time, frequency, and wavelet based features, were extracted from the S2, and analyzed in relation to the noninvasive cuff-based measures of blood pressure (mean blood pressure of 788.8 mmHg). A multivariate regression analysis was performed to determine which features better related to the blood pressure measurements. The best results, in the leave-one-out evaluation, were obtained using the frequency features set (MAE 6.08 mmHg, MAPE 7.85%, ME 0.31 mmHg).