Moderate Exercise Does Not Increase the Severity of Mitral Regurgitation Due to Mitral Valve Prolapse

Authors


  • The study was supported by The Danish Heart Foundation, grant no. 07-10-R60-A1795-B651-22405.

Address for correspondence and reprint requests: Redi Pecini, M.D., Copenhagen University Hospital, Rigshospitalet, Department of Cardiology 2142, Blegdamsvej 9, 2100 Copenhagen, Denmark. Fax: +45 35 45 25 13; E-mail: redpecini@gmail.com

Abstract

Background: Mitral regurgitation (MR) secondary to ischemic heart disease (IHD) increases during exercise. We tested the hypothesis that the same is also true for MR due to mitral valve prolapse (MVP). Methods: Consecutive patients with asymptomatic MR of varying severity underwent exercise test on a supine bicycle with workload up to a maximum of 100 W. Echocardiographic measurements were performed at rest and at peak exercise. The study was designed to detect an effective regurgitant orifice (ERO) change of at least 10 mm2 during exercise. Results: Twenty-six patients (21 male, age 56 ± 12 years (mean ± SD)) were included. Patients had an ERO of 35 ± 23 mm2 (mean ± SD) and regurgitation volume of 48 ± 38 mL (mean ± SD). In these patients, ERO remained unchanged (an increase of 2 ± 15 mm2 during exercise, P = 0.6). The regurgitation volume (RVol) decreased with 11 ± 16 mL (mean ± SD), P = 0.003. When calculated for 1 minute, RVol increased during exercise (P = 0.01), but in relation to the total cardiac output it decreased significantly (P = 0.02). Conclusion: Exercise does not increase the severity of MR due to MVP, in contrast to MR secondary to IHD. Different disease mechanisms behind these two types of MR could explain this difference. (Echocardiography 2010;27:1031-1037)

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