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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 International Conf. of the IEEE Engineering in Medicine and Biology Society - EMBC, Chicago, United States, Vol. 1, pp. 1 - 41, August, 2015.

Digital Object Identifier: 10.1109/EMBC.2014.6944870

Heart sound characteristics are linked to blood
pressure, and its interpretation is important for detection of
cardiovascular disease. In this study, heart sounds’ auscultation,
acquired from children patients (27 patients, 10.23.9 years,
35.720.8 kg, 132.325.5 cm), were automatically segmented to
extract the two main components: the first sound (S1) and
the second sound (S2). Following, 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 for each S2
feature set to determine which features better related to the
blood pressure measurements. The best results, in the leaveone-
out evaluation, were obtained using the frequency features
set, with a MAE of 6.08 mmHg, a MAPE of 7.85%, and a ME
of 0.31 mmHg, in the estimation of the mean blood pressure.