Method and apparatus for estimating systolic and mean pulmonary artery pressures of a patient
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United States of America Patent
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Apr 9, 2002
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app pub date -
Sep 8, 2000
filing date -
Sep 8, 2000
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Abstract
The method of estimating systolic and mean pulmonary artery pressures of a patient, comprising the steps of (a) producing an electric signal x.sub.s (t) representative of heart sounds of the patient; (b) extracting second heart sound S.sub.2 (t) from the signal produced in step (a); (c) extracting pulmonary and aortic components P.sub.2 (t) and A.sub.2 (t) from S.sub.2 (t); (d) extracting a signal representative of mean cardiac interval; (e) correlating the pulmonary and aortic components P.sub.2 (t) and A.sub.2 (t) to obtain a cross correlation function; (f) measuring a splitting interval of the cross correlation function obtained in step (e); (g) producing a normalized splitting interval; and (h) estimating the systolic and mean pulmonary artery pressures by means of predetermined regressive functions. The present invention also relates to an apparatus for estimating systolic and mean pulmonary artery pressures of a patient.
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