First-degree atrioventricular block: a cause of false malfunction of a mitral disc-valve prosthesis. Case report.
Malfunction of a prosthetic mitral disc valve was clinically suspected on the basis of absent valve closing sound and an early opening click in a patient with first-degree atrioventricular (A-V) block. Premature closure and opening of the prosthetic valve was demonstrated by echocardiography. All abnormal auscultatory, phonocardiographic, and echocardiographic findings disappeared promptly upon spontaneous restoration of normal A-V conduction. The possible hemodynamic mechanism is discussed, and attention is drawn to this conduction abnormality as a cause of erroneous diagnosis of prosthetic mitral valve malfunction.
D000328:Adult; D004452:Echocardiography; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000150:complications*; D006329:Heart Conduction System / Q000503:physiopathology; D006347:Heart Sounds; D006350:Heart Valve Prosthesis / Q000009:adverse effects*; D006801:Humans; D008943:Mitral Valve / Q000503:physiopathology; D008944:Mitral Valve Insufficiency / Q000209:etiology* / Q000503:physiopathology; D008946:Mitral Valve Stenosis / Q000601:surgery*; D010701:Phonocardiography; D011674:Pulse