Fig. 1

Transesophageal echocardiography was evaluated before (a,b) and after (c,d) ASD closure. (a) Preoperative D-shaped small left ventricle with dilated right ventricle. (b) No mitral regurgitation noted. (c) Postoperative rightward deviated ventricular septum with dilated mitral valve annulus. (d) Newly developed mitral regurgitation after atrial septal defect closure