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Cardiac vibrational intensity and cardiac output

Name: Cardiac vibrational intensity and cardiac output
Keywords: Humans, Heart, Cardiac Output

descriptionPublicationkeyboard_double_arrow_right Article 01 Jun 1948Publisher:Elsevier BVJournal:American Heart Journal, volume 35, pages 953-961 (issn: 0002-8703,

Authors: Paul E. Smith; John H. Foulger; Allan J. Fleming;

doi: 10.1016/0002-8703(48)90593-6

pmid: 18863744

Cardiac vibrational intensity and cardiac output

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Abstract

1. 1. An electronic heart sound meter has been devised to convert the complex pattern of low-frequency cardiac vibrations picked up at the chest wall into a simple “resultant frequency.” 2. 2. The “resultant frequency” varies during each heart cycle in a manner similar to the ventricular volume curve. 3. 3. Simultaneous records of the high-frequency ballistocardiograph and the heart sound meter made on rested, supine subjects show a close correlation between the cardiac output as calculated by Starr's formula, 11(I+J) C32 A and an “output” calculated from the formula, S=f12−f22 in which f1 is the maximum “resultant frequency” occurring at commencement of systole, and f2 is the minimum “resultant frequency” at the end of systole. 4. 4. Records of the ballistocardiograph and the heart sound meter taken immediately after exercise do not give comparable calculations of cardiac output. However, heart sound meter data after moderate exercise, after anoxia produced by breathing nitrogen, and after the Flack Test show qualitative and quantitative trends comparable to data obtained by other procedures.

Related Organizations

University of North Carolina at Chapel Hill
United States

Keywords

Humans, Heart, Cardiac Output

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