Affiliation:
1. From the Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina.
Abstract
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.
Publisher
Ovid Technologies (Wolters Kluwer Health)
Subject
Physiology (medical),Cardiology and Cardiovascular Medicine
Reference21 articles.
1. POTAIN P-C.: Note sur les dedoublements normaux des bruits du coeur. Bull. et mem. Soc. med. hop. Paris 2nd series 3: 138 1866.
2. Splitting of the second heart sound in health;LEATHAM A.;Brit. Heart J.,1951
3. ATRIAL SEPTAL DEFECT: With special reference to the Electrocardiogram, the Pulmonary Artery Pressure and the Second Heart Sound
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