Short- and Mid-Term Follow-Up Results after Percutaneous Transvenous Mitral Commissurotomy.

This study reports the clinical follow-up for 6 months of 52 patients who underwent percutaneous transvenous mitral commissurotomy (PTMC). PTMC resulted in an increase in mitral valve area from 1.1±0.3 to 1.7±0.4cm2 (p<0.0001), a decrease in mean left atrial pressure from 16±7 to 13±5mmHg (p<0.0001), and an increase in exercise time from 4.6±2.1 to 6.3±2.3min (p<0.0001). At 6 months follow-up, mitral valve area was unchanged (1.7±0.4cm2). Of 52 patients, 33 showed clinical improvement and 19 had no clinical improvement after PTMC. Univariate analysis showed (1) younger age, (2) echocardiographic score of 8 or less, (3) existence of mitral regurgitation of less than grade 2 after PTMC, and (4) amelioration in left atrial dimension, mean pulmonary artery pressure and exercise time after PTMC as correlative factors for clinical improvement.In conclusion, PTMC was an effective procedure for mitral stenosis, especially in younger patients with an echocardiographic score of 8 or less. Change in left atrial dimension was a good indicator of the effectiveness of PTMC.