Intraoperative evaluation and surgical planning in the hypertrophic cardiomyopathy.

A male, 45 year old patient, with diagnosis of septum hypertrophic cardiomyopathy, having undergone a cardiofibrilator implant in the past. Despite the optimized clinical treatment, he evolved to a progressive clinical deterioration that led to invasive treatment. However, there was not an important gradient in the exit pathway of the left ventricle (EPLV) at the echocardiogram in rest and the challenging test with dobutamine was non conclusive because it did not reach the preconized cardiac frequency. The intraoperative evaluation with a transesophageal echocardiogram using isoproterenol was fundamental for the diagnosis of the EPLV obstruction. The septum myectomy was performed successfully and the patient presented good post-operative evolution.