title: ACOUSTIC CHANGES IN NORMALLY FUNCTIONING MITRAL VALVE PROSTHESES: ECHO-PHONOCARDIOGRAPHIC OBSERVATIONS.
abstract: This study confirms previous findings of variability in the intensity of the closing click (CC) as a consequence of premature valve closure. Such alterations have been described as a normal phenomenon in several prosthetic valve models. Combined echo-phonocardiography is of particular value in evaluating prosthetic valve function in patients with unusual and confusing auscultatory changes.
authors.affiliation: St. Luke's Episcopal Hospital-Clayton Foundation for Research Laboratory and the Texas Heart Institute, Houston, Texas.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Busch
authors.forename: Leonard W.
authors.initials: LW
authors.lastname: Pechacek
authors.forename: Efrain
authors.initials: E
authors.lastname: Garcia
authors.forename: Robert J.
authors.initials: RJ
authors.lastname: Hall