TEE: what it is, and how to manage the anesthetic

Transesophageal echocardiography puts an ultrasound transducer in the esophagus, directly behind the heart, so the image is not looking through the chest wall or the lungs. For the anesthetist the important sentence is the second one: the probe is large, continuously stimulating, and stays in for the duration — which makes a diagnostic TEE one of the harder sedation assignments on the non-operating-room schedule.

What a TEE is, and why it is done from the esophagus

The esophagus sits immediately posterior to the left atrium. A transducer placed there is separated from the heart by millimeters of tissue and no bone or air, which is why TEE resolves structures that a transthoracic study cannot — the left atrial appendage, valve vegetations, prosthetic valves, the interatrial septum, the thoracic aorta.

The diagnostic indications you will meet most often:

• Before cardioversion — to exclude thrombus in the left atrial appendage.
• Endocarditis workup — vegetations, abscess, prosthetic valve involvement.
• Valve assessment where the transthoracic images are inadequate or the question is structural.

A separate use, and a different job: intraoperative TEE during cardiac surgery, where the probe goes in after induction of general anesthesia and stays for the case. The rest of this page is about the diagnostic study in a sedated patient, which is the harder anesthetic.

The patients

A cardiology population — heart failure, valve disease, atrial fibrillation on anticoagulation, suspected endocarditis — often frail. They are screened for the contraindications the probe cares about, which are esophageal rather than cardiac: strictures, varices, and recent esophageal surgery.

The anesthetic, step by step

1. Treat the fasting status as a real anesthetic question

Because it is one. The probe sits at the aspiration crossroads — a sedated patient, a suppressed gag, and a large foreign body held in the esophagus for the length of the study. Verify fasting the way you would before any anesthetic, not the way you might before a brief procedure.

2. Topicalize, then sedate

Topical oropharyngeal anesthesia does the work that would otherwise have to be bought with depth of sedation. The more effective the topicalization, the less sedation is needed to tolerate the probe — which matters because of step 3.

3. Hold the line between two failures

This is the whole case: deep enough to tolerate the probe, awake enough to protect an airway the probe is lying against. The two requirements pull in opposite directions and there is no setting that satisfies both comfortably, which is why this is a harder assignment than its scheduling suggests.

4. Plan for the cardioversion if it is coming

When cardioversion follows the study in the same encounter, the sedation plan has to include the shock: a brief deepening timed to it, with rhythm drugs and pads already in place. That is a different depth, arriving at a predictable moment — so it is planned rather than improvised.

What to watch for

• Airway obstruction and desaturation with the probe in place. The foreseeable event, and the reason the sedation depth is a continuous judgment rather than a bolus.
• Esophageal injury declaring late — pain, fever or crepitus after an apparently uneventful study. It is rare, and it does not announce itself in the room.

Antibiotics

Not indicated. Endocarditis prophylaxis for diagnostic TEE was removed from the endocarditis recommendations in 2007 and was not reinstated in the 2021 statement. This catches people out because the patient population is so often an endocarditis workup — but investigating endocarditis is not an indication to prevent it.