A TEE test, short for transesophageal echocardiogram, is an ultrasound of your heart taken from inside your body. Instead of placing the ultrasound device on your chest, a doctor guides a thin, flexible tube down your throat and into your esophagus, which sits directly behind your heart. This positioning produces much sharper images of the heart’s internal structures than a standard echocardiogram can deliver, especially of the left chambers.
How a TEE Works
The tube used in a TEE has a small ultrasound transducer on its tip. Once positioned in the esophagus, this transducer sends out sound waves that bounce off different parts of your heart. Those echoes travel back to a computer, which converts them into detailed, moving pictures showing your heart’s size, shape, valves, and blood flow in real time.
A standard echocardiogram (the kind done on the surface of your chest) has to send sound waves through skin, muscle, ribs, and lung tissue before reaching the heart. All of that tissue degrades the image. Because your esophagus runs right behind the heart with almost nothing in between, a TEE bypasses those barriers entirely. The result is a significantly clearer picture, which is why doctors order it when a chest-surface echo doesn’t provide enough detail.
Why Your Doctor Might Order One
TEE is typically ordered when standard imaging isn’t sharp enough to answer a specific clinical question. Common reasons include:
- Heart valve problems. TEE gives a detailed view of valve structure and movement, helping doctors decide whether a valve needs repair or replacement.
- Blood clots. Clots in the heart’s upper chambers, particularly the left atrial appendage, are difficult to see with a regular echo. TEE is the go-to test for finding them, especially before procedures to restore normal heart rhythm.
- Infection of the heart valves (endocarditis). TEE can reveal small growths of bacteria on the valves that standard imaging often misses.
- Aortic disease. The test provides clear views of the upper aorta, the large blood vessel leaving the heart, which helps detect tears or aneurysms.
- Guiding heart procedures. Surgeons and interventional cardiologists use live TEE images during operations and catheter-based procedures to see exactly what they’re doing in real time.
Newer 3D TEE technology has expanded what the test can do. Traditional 2D TEE shows flat cross-sections of the heart, requiring the doctor to mentally piece together a three-dimensional picture from multiple slices. Three-dimensional TEE displays the heart’s anatomy more like the surgeon will actually see it, which simplifies communication between team members and improves guidance during procedures like catheter-based valve repairs and closure of holes in the heart.
How to Prepare
You’ll need to stop eating and drinking after midnight the night before the procedure. If you take insulin or other diabetes medications, your doctor will likely adjust your dose since you’ll be fasting. If you take blood thinners, check with your prescribing doctor about whether to continue or pause them beforehand.
You’ll also need someone to drive you home, because the sedation used during the test makes it unsafe for you to drive afterward.
What Happens During the Procedure
The active imaging portion takes less than an hour, but plan on spending about three hours at the hospital total once you factor in preparation and recovery.
Here’s what the experience looks like step by step. First, you’ll gargle with a numbing liquid that deadens the back of your throat. The solutions taste bitter and may trigger a brief gagging sensation, but the numbness makes swallowing the tube much more tolerable. An IV line is placed, and you’ll receive a sedative to help you relax. Most people feel drowsy but aren’t fully unconscious.
You’ll lie on your left side, and a bite block is placed between your teeth to protect them and keep the tube centered. The doctor then slowly slides the probe through your mouth and into your esophagus. You’ll be asked to swallow to help guide it down. If needed, more numbing spray is applied to the back of your throat. Once the probe is in position, the doctor captures images by gently adjusting the tube’s angle and depth. You won’t need to do anything else during the imaging itself.
Recovery and What to Expect After
After the probe is removed, you’ll rest in a recovery area while the sedation wears off. The most common aftereffect is a sore throat, which typically resolves within a few days on its own. Some people also experience mild difficulty swallowing for a short time.
You should not eat or drink anything until the numbness in your throat is completely gone, because swallowing safely requires you to feel the back of your throat normally. Once the numbness fades, you can return to your regular diet. Avoid alcohol for 24 hours. The sedative can linger in your system for the rest of the day, so hold off on driving or operating heavy machinery until you feel fully alert and can think and react clearly.
Risks and Complications
TEE is considered a safe test. The overall complication rate in routine diagnostic procedures ranges from about 0.4% to 1.4%. The most serious potential complication, a tear or perforation of the esophagus, is rare, occurring in roughly 0.01% to 0.38% of cases. When TEE is used during complex interventional heart procedures (like catheter-based valve repairs), complication rates are somewhat higher, around 5% to 6%, largely because the probe stays in longer and requires more manipulation.
Minor issues are more common and include a sore or scratchy throat, slight lip bruising from the bite block, or temporary discomfort when swallowing. These typically clear up within a few days without treatment. Serious complications like esophageal tears, while very rare, require surgical repair and a recovery period of several weeks.
TEE vs. Standard Echocardiogram
A regular echocardiogram is noninvasive, painless, requires no sedation, and works well for most routine heart assessments. TEE exists for situations where that approach falls short. If your doctor needs to see fine details of the heart valves, look for small blood clots, evaluate a possible infection on the valves, or guide a procedure in real time, TEE provides the image quality to do it. The tradeoff is that it involves sedation, a probe in your throat, and a longer time commitment at the hospital. Your doctor will order it when the benefit of the sharper images outweighs those inconveniences.