This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Request Permissions Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by LUISADA, A. A. Articles by Harvey, I. Search for Related Content PubMed PubMed Citation Articles by LUISADA, A. A. Articles by Harvey, I.

(Circulation. 1967;35:119.)
© 1967 American Heart Association, Inc.

---

Normal First Heart Sounds with Nonfunctional Tricuspid Valve or Right Ventricle

Clinical and Experimental Evidence

ALDO A. LUISADA M.D.¹; HARRY KURZ M.D.¹; SHELDON J. SLODKI M.D.¹; DONALD M. MACCANON PH.D.¹; BERNARDO KROL M.D.¹; I. Harvey ¹

¹ From the Divisions of Cardiovascular Research, The Chicago Medical School and Cardiology (Medicine), Mount Sinai Hospital Medical Center, Chicago, Illinois.

A case of Ebstein's malformation of the tricuspid valve with persistent foramen secundum and right bundle-branch block is presented. Preoperative tracings revealed three distinct components of the first sound with normal intervals between them. After resection of a single floating tricuspid leaflet, closure of the septal defect, and insertion of a Starr-Edwards valve, the phonocardiogram again showed three normal components of the first heart sound, followed by a loud closing snap of the prosthetic tricuspid valve. This case demonstrates the occurrence of the three normal components of the first heart sound independently of right ventricular contraction and of tricuspid closure or tensing. In five dogs left ventricular phonocardiograms, made after right heart bypass and destruction of the free ventricular wall, revealed three normal components of the first heart sounds in three animals, and of the first two components, separated by normal intervals in two others. These experiments exclude any participation of the right ventricle or tricuspid valve in the mechanism of origin of the first heart sound. The authors conclude that the three normal components of the first heart sound are of left-sided origin and that the designation "tricuspid" for the second component should be abandoned.

Key Words: Phonocardiography • Ebstein's anomaly

This article has been cited by other articles:

				R. Prakash Genesis of Heart Sounds JAMA, December 15, 1978; 240(25): 2732 - 2732. [Abstract] [PDF]

				S. Zoneraich, O. Zoneraich, J. J. Rhee, and M. P. Gupta Graphic Findings in Acute Aortic Regurgitation Caused By Destruction of Aortic Cusp: The Origin of First Heart Sound Angiology, January 1, 1977; 28(1): 7 - 14. [Abstract] [PDF]