Transesophageal echocardiography (TEE) is becoming a more prevalent method of monitoring and diagnosis in the perioperative setting for critically ill patients and patients undergoing cardiac surgery. Many TEE measurements are extrapolated from transthoracic echocardiography (TTE) data and have not validated by transesophageal means. The aim of this study is to validate TEE assessment of right ventricular function by comparing them to simultaneously measured TTE measurements.