On-pump Intraoperative Echocardiography (OPIE)

This pilot study uses an ultrasound probe that is currently clinically used to assess pituitary anatomy, the Hitachi-Aloka high resolution pituitary transducer to measure left ventricular (LV) septal thickness during cardiopulmonary bypass in the performance of surgical septal myectomy. Septal thickness will be assessed and can be visualized during the procedure and if it is likely to improve the efficacy and safety of the procedure. The probe has FDA clearance for a variety of intra-operative surgical procedures but will be off-label for this cardiac surgical protocol.