The impact of concomitant pulmo- nary hypertension on early and late outcomes following surgery for mitral stenosis. J Thorac Cardiovasc Surg. 2016;152:394 400.e1. 15. Demirkan B, Guray Y, Guray U, et al. The acute effect of percutaneous mitral balloon valvuloplasty on atrial electromechanical delay and P-wave dispersion in patients with mitral stenosis. Herz. 2013;38:210 5. 16. Aviles RJ, Nishimura RA, Pellikka PA, et al. Utility of stress Doppler echocar- diography in patients undergoing percutaneous mitral balloon valvotomy. J Am Soc Echocardiogr. 2001;14:676 81. 17. Bouleti C, Iung B, Himbert D, et al. Relationship between valve calcifica- tion and long-term results of percutaneous mitral commissurotomy for rheumatic mitral stenosis. Circ Cardiovasc Interv. 2014;7:381 9. 18. Baumgartner H, Hung J, Bermejo J, et al. Echocardiographic assessment of valve stenosis: EAE/ASE recommendations for clinical practice. Eur J Echocardiogr. 2009;10:1 25. 19. Cannan CR, Nishimura RA, Reeder GS, et al. Echocardiographic assess- ment of commissural calcium: a simple predictor of outcome after percu- taneous mitral balloon valvotomy. J Am Coll Cardiol. 1997;29:175 80. 20. Apostolakis EE, Baikoussis NG. Methods of estimation of mitral valve re- gurgitation for the cardiac surgeon. J Cardiothorac Surg. 2009;4:34. 21. Badheka AO, Shah N, Ghatak A, et al. Balloon mitral valvuloplasty in the United States: a 13-year perspective. Am J Med. 2014;127:1126 e1 12. 22. Abascal VM, Wilkins GT, O Shea JP, et al. Prediction of successful outcome in 130 patients undergoing percutaneous balloon mitral valvotomy. Circu- lation. 1990;82:448 56. 23. Wilkins GT, Weyman AE, Abascal VM, et al. Percutaneous balloon dilata- tion of the mitral valve: an analysis of echocardiographic variables related to outcome and the mechanism of dilatation. Br Heart J. 1988;60:299 308. 24. Sutaria N, Northridge DB, Shaw TR. Significance of commissural calcifica- tion on outcome of mitral balloon valvotomy. Heart. 2000;84:398 402. 25. 