Transesophageal Echocardiography (TEE) is a test that doctors use to look closely at the heart. An ultrasound is used to examine and take detailed photos of the structures of the heart, resulting in a more accurate picture. To place the ultrasound next to the heart, doctors place a transducer into the esophagus and "snake" it down until it lies adjacent to the cardiac muscle. Due to the discomfort of the test, sedation is usually required.