Longitudinal valvotomy of anterior leaflet for endoscopic transmitral myectomy for hypertrophic obstructive cardiomyopathy.

Transmitral myectomy for hypertrophic obstructive cardiomyopathy is compatible with minimally invasive surgery compared with traditional transaortic access. It has often been performed in conjunction with mitral valve replacement or temporary detachment of the anterior leaflet from its annulus. We present a novel approach: longitudinal incision at the midline of the anterior mitral leaflet for septal myectomy. The procedure is ideally conducted endoscopically or robotically through the right chest. Cardiopulmonary bypass is established in the usual manner. After cardioplegic arrest, the mitral valve is exposed, and the anterior mitral leaflet is incised longitudinally at the midline. Both parts of the leaflet are tentatively fixed to the atrial wall with sutures to keep them open. Using the look-up mode of a 30° scope, the right cusp of the aortic valve is observed. Myectomy is initiated close to the aortic annulus using the pure-cut mode of electrocautery and scissors, then extended apically as necessary. After myectomy, the anterior leaflet is reapproximated with interrupted sutures. This technique is simpler than the detachment of the anterior leaflet and does not require patch materials that could lead to durability issues for the reconstruction of the anterior leaflet.