Phonocardiographic evidence of extreme variability of the time interval between the aortic sound (A2) and the opening click (OC) with intermittent absence of the OC of a partially detached mitral prosthesis of the Starr-Edwards type has not hitherto been reported. This case illustrates the diagnostic use of phonocardiography in a malfunctioning mitral Starr-Edwards prosthesis.
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