Feasibility of percutaneous mitral commissurotomy in patients with commissural mitral valve calcification

Whether a percutaneous mitral commissurotomy (PMC) should be attempted in patients with mitral stenosis (MS) and valvular calcification, especially located at the commissural level remained debated. We sought to evaluate the impact of the degree and location of mitral valve calcifications on PMC results.

Over a 3-year period, we enrolled 464 consecutive patients who underwent a PMC at our institution. According to the location (within the body valve leaflets' or at the commissural level) and the degree of calcification, patients were divided into three groups: 261 patients were in Group 1 (no leaflets' or commissural calcification), 141 in Group 2 (leaflets' calcification with no significant commissural calcification), and 62 in Group 3 (at least one commissure significantly calcified). Final valve area (1.83 ± 0.26, 1.71 ± 0.25, and 1.60 ± 0.24 cm(2), P < 0.00001) and the rate of complete opening of at least one commissure (92, 94, and 84%, P = 0.05) were significantly different. However, the rate of post-PMC mitral regurgitation (MR) of grade ≥ 3 (10, 10, and 8%, P = 0.90) was not different among the groups and if the rate of good immediate result, defined as valve area ≥ 1.5 cm(2) with no MR >2/4 was different among the three groups (88, 78, and 73%, P = 0.004), an overallprocedural success could be achieved in most patients with calcified commissures.

In this large contemporary series of patients with MS, a procedural success was obtained less frequently in patients with calcified commissure but a successful PMC could still be safely achieved in a large proportion of patients. Our results support the use of PMC as a first-line treatment of patients with severe MS even in the presence of significant commissural calcifications with otherwise favourable clinical characteristics.