The Mechanism of Respiratory Variation in Splitting of the Second Heart Sound | Zendy

Robert F. Castle | Zendy; Kenneth L. Jones | Zendy

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The Mechanism of Respiratory Variation in Splitting of the Second Heart Sound

Author(s) -

Robert F. Castle,

Kenneth L. Jones

Publication year - 1961

Publication title -

circulation

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 7.795

H-Index - 607

eISSN - 1524-4539

pISSN - 0009-7322

DOI - 10.1161/01.cir.24.2.180

Subject(s) - medicine , expiration , supine position , sound (geography) , respiration , cardiology , second sound , respiratory system , anatomy , acoustics , physics

This study of 68 normal children has shown that in the supine position and under conditions of normal respiration splitting of the second sound averages .02 second in expiration and .04 second in inspiration. Inspiratory increase in splitting of the second sound is the result not only of a delay in pulmonic valve closure but also of earlier aortic closure. Movement of the aortic component is responsible, on the average, for 35 per cent of the difference in splitting of the second sound in inspiration and expiration.

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