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Noninvasive stress testing - Methodology for elimination of the phonocardiogramMeasurement by systolic time intervals (STI) of cardiac responses requires extremely careful recording during actual stress test performance. Previous work indicated no significant changes in the pulse transmission time (PTT) during exercise and other challenges. Since external STI depend on the carotid pulse offset by the PTT as an aortic curve equivalent, stable PTT implies that timing of the carotid upstroke and the carotid incisura would respectively track the pre-ejection period and the aortic incisura. In ten subjects, STIs were recorded at supine rest, sitting, standing, during prompt and sustained squatting and during isometric and dynamic exercise. The results demonstrated the tracking of both points. Coefficients of correlation and of determination were uniformly high for all challenges except isometric handgrip (IHG). Since left ventricular ejection time is obtained directly from the pulse curve, with the exception of IHG, STI responses during stress testing can be measured without a phonocardiogram.
Document ID
19760048975
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Spodick, D. H.
(Lemuel Shattuck Hospital Boston, Mass., United States)
Lance, V. Q.
(Tufts University Boston, Mass., United States)
Date Acquired
August 8, 2013
Publication Date
April 1, 1976
Publication Information
Publication: Circulation
Volume: 53
Subject Category
Aerospace Medicine
Accession Number
76A31941
Funding Number(s)
CONTRACT_GRANT: NGR-22-012-026
Distribution Limits
Public
Copyright
Other

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