The findings in a patient with surgically proven Lutembacher's syndrome (coexisting mitral stenosis and atrial septal defect) are presented. In addition to a typical pattern of mitral stenosis, the preoperative echocardiogram revealed paradoxical septal motion, thereby providing, prior to cardiac catheterization, a basis for the suspicion of an associated lesion due to diastolic overload of the right ventricle.
