Mitral valve commissurotomy versus replacement. Considerations based on examination of operatively excised stenotic mitral valves.

Among 164 patients who underwent mitral valve replacement because of mitral stenosis (with or without mitral regurgitation) and had radiographs taken of their operatively excised mitral valves, 20 had absent or minimal calcific deposits in the excised valves and absent or minimal mitral regurgitation as determined, except for one patient, by left ventricular angiography preoperatively. This report focuses on these 20 patients to ask if mitral valve replacement was preferable to mitral valve commissurotomy. Although in the pre-valve replacement era, all 20 patients almost surely would have been considered good candidates for mitral commissurotomy, other factors, namely, the need to replace one or more other cardiac valves (13 patients), the utilization of cardiopulmonary bypass allowing visual inspection rather than simple palpation of the diseased mitral valve (all 20 patients), relatively little experience with mitral commissurotomy in four of the five surgeons (17 patients), displeasure with attempted commissurotomy (three patients), previous mitral commissurotomy (11 patients), and incorrect identification of mitral calcific deposits (two patients), each contributed in one or more patients to the final decision of replacement versus commissurotomy. Even though mitral commissurotomy has been in use for 30 years, the mere alternative of valve replacement may have altered somewhat the definition of the stenotic mitral valve previously considered ideal for mitral commissurotomy.