title: Clinical experience with the Medtronic-Hall valve prosthesis.
abstract: Medtronic-Hall valves were implanted during 204 procedures performed between 1982 and 1988. Mean population age was 54.4 years; 96% of patients were in New York Heart Association functional class III or greater. Emergency operations constituted 16% of the procedures. Rheumatic heart disease was the single most common indication for valve replacement. In 18% of patients, operation was performed to replace a previous prosthetic valve. The mean follow-up was 3.2 years. Overall operative mortality was 10.3%, the highest mortality being for double-valve replacements (24%). Valve-related mortality, by position, was 5.3% for aortic valves, 6.0% for mitral valves, and 4.0% for multiple-valve replacements. Actuarial 5-year freedom from events were: survival, 68%; thromboembolism, 90%; prosthetic valve endocarditis, 98%; paravalvular leak, 95%; and reoperation, 92%. Complications with the highest mortality were thromboembolism (36%) and endocarditis (33%). The complication rates in this series are high but the patients were more severely ill than in other reports, and operative survivors experienced a considerable improvement in New York Heart Association functional class.
authors.affiliation: Division of Cardiothoracic Surgery, University of Pittsburgh, Pennsylvania 15261.
authors.forename: R J
authors.initials: RJ
authors.lastname: Keenan
authors.forename: J M
authors.initials: JM
authors.lastname: Armitage
authors.forename: A
authors.initials: A
authors.lastname: Trento
authors.forename: R D
authors.initials: RD
authors.lastname: Siewers
authors.forename: R L
authors.initials: RL
authors.lastname: Hardesty
authors.forename: H T
authors.initials: HT
authors.lastname: Bahnson
authors.forename: B P
authors.initials: BP
authors.lastname: Griffith
mesh_terms: D001021:Aortic Valve / Q000601:surgery; D002423:Cause of Death; D004630:Emergencies; D004696:Endocarditis / Q000209:etiology / Q000401:mortality; D005260:Female; D005500:Follow-Up Studies; D006350:Heart Valve Prosthesis / Q000009:adverse effects / Q000401:mortality; D006801:Humans; D008297:Male; D008875:Middle Aged; D008943:Mitral Valve / Q000601:surgery; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012086:Reoperation; D012214:Rheumatic Heart Disease / Q000601:surgery; D015996:Survival Rate; D013923:Thromboembolism / Q000209:etiology / Q000401:mortality