A transesophageal echocardiogram, commonly called a TEE, is an ultrasound of the heart performed by passing a thin, flexible probe down the esophagus (the tube connecting the mouth to the stomach) rather than pressing a sensor against the chest wall. Because the esophagus sits directly behind the heart, this approach delivers much sharper images of the heart’s valves, chambers, and surrounding structures than a standard echocardiogram can provide through the ribs and lungs. The procedure typically takes 20 to 40 minutes, involves sedation, and is considered safe, with serious complications occurring in fewer than one in a thousand cases.
Why a TEE Is Ordered
A standard transthoracic echocardiogram (TTE) works well for many patients, but it has blind spots. Bone, lung tissue, and body habitus can degrade the image quality. When a clearer look at certain structures is needed, TEE fills the gap. The most common reasons doctors order one fall into a handful of categories.
Blood clots in the left atrial appendage are a major concern before procedures like cardioversion or catheter ablation for atrial fibrillation. TEE is considered the gold standard for detecting these clots.1PubMed Central. Cardiac Computed Tomography Versus Transesophageal Echocardiography for the Detection of Left Atrial Appendage Thrombus: A Systemic Review and Meta‐Analysis If a clot is present, the planned procedure is usually delayed until it resolves with blood-thinning medication.
Infective endocarditis, an infection of the heart valves, is another common indication. Bacteria can form clumps called vegetations on a valve. A chest-wall echo detects these growths roughly 40–63% of the time, while TEE picks them up in about 90–100% of cases.2PubMed Central. Echocardiography in infective endocarditis TEE is also better at spotting small vegetations under one centimeter and detecting complications like abscesses near the valve ring.3CHEST. Value of Transesophageal Echocardiography as an Adjunct to Transthoracic Echocardiography in Evaluation of Native and Prosthetic Valve Endocarditis For suspected endocarditis involving Staphylococcus aureus, many guidelines recommend going straight to TEE even if the chest-wall echo looks normal.4PubMed Central. Infective Endocarditis: Echocardiographic Imaging and New Imaging Modalities – Section: ECHOCARDIOGRAPHY
Beyond clots and infections, TEE is routinely used to evaluate prosthetic heart valves (which create shadowing artifacts on chest-wall echo), assess congenital heart defects in adults, look for a hole between the heart’s upper chambers before closure, and investigate sources of stroke when a cardiac origin is suspected.
How to Prepare
If you are scheduled for a TEE, the most immediate instruction you’ll receive is to stop eating and drinking beforehand. Guidelines typically call for at least four to six hours of fasting.5Journal of The Indian Academy of Echocardiography & Cardiovascular Imaging. Indian Academy of Echocardiography Guidelines for Performance of Transesophageal Echocardiography in Adults – Section: Patient Set-up, Anesthesia, Intra-procedure Monitoring Considerations The purpose is to reduce the small risk that stomach contents could enter the airway during sedation.
That said, some researchers have questioned how strictly fasting needs to be enforced for procedures done under conscious sedation rather than general anesthesia. Fasting periods often run longer than intended, and the actual risk of aspiration under sedation is quite small. One review argued that overly strict fasting can cause dehydration, low blood sugar, and kidney stress, and recommended a more individualized approach.6PubMed. Is NPO (Nil Per Os) Order Helping or Hindering Elective Cardiac Procedures? In practice, most labs still enforce fasting, so follow your doctor’s specific instructions.
Other pre-procedure steps include reviewing your medications (if you’re on warfarin and your clotting levels are in the therapeutic range, you generally don’t need to stop it), removing dentures, and signing a consent form. The team will ask about allergies, difficulty swallowing, and any history of esophageal problems. An exam of the mouth and throat helps identify anything that might complicate probe insertion.7Journal of The Indian Academy of Echocardiography & Cardiovascular Imaging. Indian Academy of Echocardiography Guidelines for Performance of Transesophageal Echocardiography in Adults – Section: Patient Set-up, Anesthesia, Intra-procedure Monitoring Considerations
What Happens During the Procedure
You’ll lie on your left side. An IV line provides sedation, typically a combination of a short-acting sedative and a pain reliever. Your throat is numbed with a topical spray to suppress the gag reflex. Throughout the procedure, your heart rate, blood pressure, and oxygen levels are monitored continuously.
Once you’re sedated, the physician guides the probe, which is roughly the diameter of a finger, past the back of the throat and into the esophagus. The imaging typically begins in the mid-esophagus, about 35 centimeters past the teeth, where the probe sits right behind the heart. From there, the physician rotates and angles the probe’s tip to capture different views of all four chambers, the valves, the aorta, and nearby structures. The probe is then advanced into the stomach, roughly 40 to 50 centimeters past the teeth, for additional views looking up at the heart from below.8PubMed Central. A systematic approach to performing a comprehensive transesophageal echocardiogram: A call to order – Section: Methods
Modern probes are multiplane, meaning the imaging crystal can rotate electronically through 180 degrees without physically turning the probe. This lets the sonographer acquire dozens of different cross-sections of the heart from a single probe position. The entire imaging portion usually takes 15 to 25 minutes, though more complex cases may run longer. Early single-plane probes could only capture a narrow slice of the heart; the evolution to multiplane technology dramatically expanded what TEE can show.9PubMed Central. The Evolutionary Development of Echocardiography – Section: Transesophageal Echocardiography
Sedation Versus General Anesthesia
Most diagnostic TEEs are done under conscious sedation, which means you’re drowsy and relaxed but not completely unconscious. When TEE is used to guide a procedure in the catheterization lab, however, the choice between conscious sedation and general anesthesia becomes a real question. A meta-analysis comparing the two approaches during transcatheter mitral valve repair found no meaningful difference in procedural success (about 96–98% in both groups) or in-hospital mortality (around 3% overall). What did differ was the length of intensive care unit stay: patients sedated without general anesthesia spent an average of about 1.3 days in the ICU compared with roughly 3.8 days for those under general anesthesia.10European Heart Journal – Cardiovascular Imaging. Comparing sedation vs. general anaesthesia in transoesophageal echocardiography-guided percutaneous transcatheter mitral valve repair: a meta-analysis – Section: Results Total hospital stays trended shorter too, though that difference didn’t reach statistical significance. The practical upshot: when the clinical situation allows it, lighter sedation may mean a faster recovery without sacrificing safety.
Risks and Complications
TEE is broadly considered a safe test. The overall complication rate in large patient series is roughly 0.2%, and the overwhelming majority of procedures finish without incident.11PubMed Central. Esophageal perforation after transesophageal echocardiography: A case report – Section: Introduction / Discussion Minor side effects such as a sore throat, mild difficulty swallowing, or lip numbness are far more common than any serious problem and typically resolve within a day.
The most feared complication is esophageal perforation, a tear in the esophageal wall. It is rare, reported in large series at a rate between about 0.03% and 0.09%, but it is life-threatening when it occurs. A systematic review found a mortality rate of about 28% among patients who experienced this complication.12PubMed Central. Esophageal perforation after transesophageal echocardiography: A case report – Section: Introduction / Discussion This is one reason the medical team carefully screens for esophageal disease, prior radiation to the chest, or conditions like Zenker’s diverticulum before inserting the probe.
Other potential complications include bleeding (especially relevant if you have clotting problems or esophageal varices), aspiration of stomach contents, arrhythmias triggered by the probe touching the heart, and reactions to the sedation. In a small case series of 14 patients with known esophageal varices who underwent TEE, no major bleeding occurred and all procedures successfully provided the needed clinical information.13PubMed. Review of complications in a series of patients with known gastro-esophageal varices undergoing transesophageal echocardiography – Section: RESULTS That series is small and shouldn’t be taken as blanket reassurance, but it suggests the risk in patients with varices, though real, may be manageable with careful technique. Liability analyses have shown that the most common legal claims related to TEE involve not ordering it when it was needed, inadequate documentation, and failing to properly monitor the patient before, during, and after the test.14PubMed. Characterization of Medical Professional Liability Risks Associated With Transesophageal Echocardiography – Section: CONCLUSIONS
TEE in the Operating Room
During open heart surgery, an anesthesiologist or cardiac imaging specialist often performs TEE throughout the operation. This intraoperative TEE serves two purposes: monitoring the heart’s function and blood volume in real time, and evaluating the surgical result before the patient’s chest is closed. The American Heart Association has described the growing role of intraoperative TEE in improving outcomes and managing complex surgical decisions.15PubMed. Considerations of Intraoperative Transesophageal Echocardiography During Adult Cardiac Surgery: A Scientific Statement From the American Heart Association
Valve repair surgery is the classic example of where this matters most. The surgeon fixes a leaking mitral valve, the heart is restarted, and the TEE team immediately checks whether the repair is holding or whether there is still significant leakage. If the repair is unsatisfactory, the surgeon can go back on bypass and revise it right away rather than discovering the problem days later. TEE is similarly valuable in congenital heart surgery, where the anatomy is often complex and small residual defects can have major consequences.16PubMed. Impact of perioperative transesophageal echocardiography on cardiac surgery
Guiding Catheter-Based Heart Procedures
A growing number of heart procedures are performed without open surgery, using catheters threaded through blood vessels. TEE has become indispensable for guiding many of these. During transcatheter mitral valve edge-to-edge repair (a procedure where a clip is placed to reduce valve leakage), TEE guides every step: the puncture through the wall between the upper chambers, the positioning of the clip, and the assessment of residual leakage after the clip is deployed.17Structural Heart. Echocardiographic Guidance of Transcatheter Mitral Valve Edge-To-Edge Repair – Section: Procedural guidance Without live TEE, these procedures would rely almost entirely on X-ray fluoroscopy, which shows the hardware but not the soft tissue of the heart.
TEE guidance is also critical during transcatheter aortic valve replacement, closure of holes between the upper chambers, and implantation of devices in the left atrial appendage. Real-time three-dimensional TEE has added another dimension to this guidance, giving the interventional team a surgeon’s-eye view of structures that two-dimensional imaging can only show in slices.18PubMed. Real-time three-dimensional transesophageal echocardiography adds value to transcatheter aortic valve implantation – Section: RESULTS
Three-Dimensional TEE
Traditional two-dimensional TEE captures flat cross-sections of the heart. Three-dimensional TEE reconstructs those slices into a volumetric image you can rotate and crop on screen. The difference is a bit like comparing a single photograph to a 3D model you can spin around. This is especially useful for the mitral valve, whose complex saddle shape and multiple scallops are hard to appreciate in flat images. A single 3D display can show the entire valve from above, revealing prolapsing segments, clefts, and perforations that would require multiple 2D views to piece together.19PubMed Central. Three-dimensional transesophageal echocardiography: Principles and clinical applications – Section: Clinical Applications
In valve disease, 3D TEE has shown about 96% agreement with what surgeons actually find when they open the heart.20PubMed. Real-time three-dimensional transesophageal echocardiography in valve disease: comparison with surgical findings and evaluation of prosthetic valves – Section: RESULTS For interventional guidance, 3D imaging may lead to shorter procedures and less radiation exposure by giving the team the spatial information they need without as many fluoroscopy runs.21Interventional Cardiology. 3D Echo Guidance for Structural Heart Interventions Not every echo lab has 3D-capable probes, but they are becoming increasingly common in centers that perform structural heart procedures.
How TEE Compares to CT and MRI
TEE isn’t the only advanced imaging tool for the heart, and it isn’t always the best one for every question. Cardiac CT has become a strong competitor for certain diagnoses. For detecting blood clots in the left atrial appendage, CT has shown sensitivity and specificity of about 99% and 94% respectively when compared against TEE as the reference standard.22EP Europace. Cardiac computed tomography and magnetic resonance imaging vs. transoesophageal echocardiography for diagnosing left atrial appendage thrombi – Section: Results Cardiac MRI was also accurate but somewhat less sensitive. For predicting recurrent stroke, TEE and CT performed comparably in one study.23PubMed. Predictors of Recurrent Stroke in Patients with Ischemic Stroke: Comparison Study between Transesophageal Echocardiography and Cardiac CT – Section: RESULTS
The tradeoffs differ by what you’re looking for. In infective endocarditis, TEE is far better at spotting valve vegetations (about 94% sensitivity versus 64% for CT) and detecting leaflet perforations. But multiphase CT is better at finding abscesses and pseudoaneurysms around the valve, with about 87% sensitivity compared to roughly 69% for TEE.24PubMed Central. Comparative Value of Cardiac CT and Transesophageal Echocardiography in Infective Endocarditis: A Systematic Review and Meta-Analysis – Section: RESULTS In practice, the two modalities often complement each other rather than compete.
From the patient’s perspective, the appeal of CT is that it doesn’t require sedation or swallowing a probe. But CT involves radiation and iodine-based contrast dye, which matters for people with kidney problems or contrast allergies. TEE uses no radiation and no contrast, and it provides real-time moving images rather than a snapshot frozen in time. The choice usually depends on the specific clinical question and the patient’s anatomy and preferences.
Intracardiac Echo as an Alternative
Intracardiac echocardiography (ICE) uses a small ultrasound catheter inserted through a vein and advanced directly into the heart. It’s increasingly popular for guiding catheter ablation in atrial fibrillation because it eliminates the need for esophageal intubation entirely. A randomized trial comparing ICE to TEE for guiding atrial fibrillation ablation found that ICE was noninferior for safety: blood-clot-related events occurred in about 0.4% of the ICE group versus 0.6% of the TEE group, well within the prespecified margin.25JAMA Cardiology. Intracardiac vs Transesophageal Echocardiography in Atrial Fibrillation Ablation: A Randomized Clinical Trial – Section: Results
TEE remains the standard for most structural heart interventions because it offers wider fields of view and the 3D capability that ICE currently lacks in most platforms.26JACC: Cardiovascular Interventions. Intracardiac Echocardiography in Structural Heart Disease Interventions – Section: Utility of ICE in Contemporary SHD Interventions But as ICE probes improve, the boundary between what each technology handles best continues to shift. For patients, the practical difference is whether they need sedation or general anesthesia (for TEE) versus an additional catheter in a vein (for ICE).
TEE in Cardiac Arrest
One of the more dramatic recent applications of TEE is during active cardiopulmonary resuscitation. When someone’s heart stops, a standard chest-wall echo is difficult to obtain without pausing compressions, and image quality during CPR is often poor. A TEE probe, once placed, can provide continuous imaging without interrupting chest compressions. Studies have found that TEE influences clinical decisions during cardiac arrest in up to 78% of cases, often revealing conditions like aortic dissection or cardiac rupture that a chest-wall echo misses.27PubMed Central. Transesophageal echocardiography in cardiac arrest: why, how, when, and where in clinical practice – Section: Why should TEE be used?
TEE during CPR can also optimize the mechanics of resuscitation itself. Real-time imaging shows exactly where compressions are landing on the heart, and the team can adjust hand placement to compress the left ventricle more effectively. In reported cases, repositioning compressions based on TEE guidance produced immediate improvements in arterial pressure and end-tidal CO2, both markers of CPR quality.28PubMed Central. Point of Care Transesophageal Echocardiogram-guided CPR: Area of maximal compression – Section: Discussion Feasibility has even been tested in the field: one study of out-of-hospital cardiac arrests found that paramedic-placed TEE exams could be completed in an average of about five minutes, with the findings prompting management changes in several patients.29Scientific Reports. Feasibility of resuscitative transesophageal echocardiography at out-of-hospital emergency scenes of cardiac arrest – Section: Results
TEE in Infants and Small Children
Adult TEE probes are too large for neonates and small infants, but miniaturized probes have made perioperative TEE possible even in patients weighing as little as 2.5 kilograms. In a study of 33 patients ranging from three days to two years old, a micro-TEE probe provided good-quality images in every case with no complications from insertion. The findings led surgeons to revise the repair in five patients before leaving the operating room, catching problems that the alternative imaging approach would have missed.30PubMed Central. Preliminary evaluation of a microtransesophageal probe in neonates and young infants undergoing surgery for congenital heart disease – Section: Results
Another evaluation of a micro-multiplane probe in 42 children (from four days old and 2.5 kilograms up to six years) found excellent diagnostic quality but noted that two neonates under three kilograms needed ventilator adjustments because the probe increased airway resistance. Three patients in that series went back on bypass for surgical revisions prompted by TEE findings.31European Journal of Echocardiography. Intraoperative evaluation of micromultiplane transesophageal echocardiographic probe in surgery for congenital heart disease These probes are still specialized equipment found mainly at pediatric cardiac surgery centers, but they’ve filled a genuine gap in monitoring the youngest patients with complex heart defects.
Probe Cleaning and Infection Prevention
Because the TEE probe enters the body, proper cleaning between patients is critical. A systematic review examining infection outbreaks linked to ultrasound probes found that six of the seven identified outbreak studies involved TEE probes specifically. The infections were tied to breakdowns in the disinfection process: missing steps, inadequate storage, and failure to inspect probes for damage. When labs corrected these deficiencies, the infections stopped.32PubMed. Infection Transmission Associated With Contaminated Ultrasound Probes: A Systematic Review Professional societies have published detailed guidelines for probe decontamination, covering cleaning immediately after use, high-level disinfection with chemical agents, rinsing, drying, and proper storage to prevent recontamination.33PubMed. Guidelines for transoesophageal echocardiographic probe cleaning and disinfection from the British Society of Echocardiography If you’re curious about your lab’s practices, it’s entirely reasonable to ask how they clean the probe. A well-run lab will have a standardized protocol and won’t be offended by the question.