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If your doctor has recommended a TEE test (transesophageal echocardiography), you may be wondering why it is needed. Most heart conditions are initially diagnosed and assessed by TTE or transthoracic echocardiography. Transesophageal echocardiography is used selectively when more detailed anatomical information is needed, when TTE findings are unclear, or when planning and guiding treatment.
What Is a TEE Test and What Can It Tell About Your Heart?
A TEE test (Transesophageal Echocardiography) is a specialized ultrasound that helps doctors examine the heart in greater detail. During the procedure, the cardiologist gently passes a thin, flexible tube with a small ultrasound probe through the esophagus, which sits directly behind the heart. This position helps capture clear, detailed images without interference from the ribs or lungs.
A TEE heart test can provide clearer information about the heart valves, heart chambers, major blood vessels, and blood flow. It may also help identify blood clots, heart infections, congenital heart defects, or other structural abnormalities that need further evaluation. Although TEE test can provide highly detailed heart images, doctors do not use it for routine screening. Instead, cardiologists usually recommend it when they need more information to confirm a diagnosis or guide treatment.
TEE Test VS. TTE: What’s the Difference?
Both a TEE test and a transthoracic echocardiogram (TTE) use ultrasound to examine the heart. Each test, however, serves a distinct purpose. Doctors typically start with a TTE, as it’s non-invasive. If more detailed imaging or a closer look at specific heart structures is needed, they may then recommend a TEE.
| Feature | Transthoracic Echocardiogram (TTE) | Transesophageal Echocardiography (TEE) |
| How the test is performed | An ultrasound probe is placed on the chest. | A thin ultrasound probe is passed through the esophagus. |
| Image quality | Provides good images for most heart conditions. | Provides more detailed views of selected heart structures. |
| Typical role | Initial diagnosis and assessment of most heart conditions | Selective use when TTE findings remain unclear or when additional anatomical information is needed |
| Sedation | Usually not required. | Commonly used but not always required. |
| Recovery | Patients can usually return to normal activities immediately. | Patients need time to recover from sedation and should arrange transportation home. |
Why Doctors May Recommend a TEE Heart Test
Cardiologists use TEE selectively to answer important clinical questions, clarify uncertain findings, and support treatment planning.
A cardiologist may use this examination to:
- Confirm or rule out a suspected diagnosis when previous test results need further clarification.
- Evaluate the severity of a heart condition before deciding on the next step in treatment.
- Plan treatment or certain heart procedures using more detailed heart images.
- Examine heart valves, chambers, and nearby structures in greater anatomical detail.
Before recommending TEE, the cardiologist considers the patient’s symptoms, medical history, previous test results, and the specific information needed for diagnosis or treatment.
What Heart Conditions Can a TEE Test Help Evaluate?
TEE provides detailed anatomical views of selected heart structures, helping cardiologists with diagnosis, clinical decision-making, and certain cardiac procedures.
- Heart valve disease – checking whether the valves have narrowing, leakage, infection, or damage.
- Blood clots inside the heart – looking for clots that may increase the risk of stroke or affect treatment decisions.
- Infective endocarditis – checking for infection on the heart valves or inner lining of the heart.
- Congenital heart defects – usually diagnosed first by TTE, while TEE is often used for detailed anatomical assessment before an intervention.
- Selected conditions of the thoracic aorta – examining specific abnormalities involving the section of the aorta inside the chest.
- Heart tumors or abnormal masses – checking for unusual growths inside or around the heart.
Cardiologists may also use TEE to guide structural heart procedures, support certain heart surgeries, and assess treatment results after an intervention.
According to Dr. Prayuth Rasmeehirun, cardiologist specializing in cardiac imaging at Vejthani International Hospital, the decision to perform a TEE test depends on each patient’s symptoms, medical history, and previous test results. Cardiologists carefully evaluate all available information before selecting the most appropriate examination to obtain the detail needed for accurate diagnosis and treatment planning.
Preparing for a TEE Heart Procedure
Preparing for a TEE test usually involves a few simple but important steps. These steps help the examination go smoothly, reduce potential complications, and enable doctors to obtain clear images of the heart.
Before the procedure, patients should:
- Avoid eating and drinking for the period the doctor recommends.
- Inform the doctor about any medical conditions, medications, and drug allergies, including prescription medicines, over-the-counter medications, vitamins, and herbal supplements.
- Inform the doctor if you have a history of esophageal disease or have undergone esophageal surgery, as this information may affect the procedure.
- Remove dentures or any removable dental appliances before the examination.
- Ask a family member or caregiver to accompany them home if the doctor plans to use sedation, and follow the doctor’s instructions after the procedure.
What Happens During a TEE Heart Procedure?
During a TEE test, patients can expect several steps designed to keep them comfortable while the cardiologist examines the heart.
1. Before the Procedure
The nurse checks the patient’s vital signs, helps the patient get into a comfortable position, and monitors heart rate, blood pressure, and blood oxygen levels. The nurse also places an intravenous (IV) line if medications are needed during the procedure. Next, the doctor sprays a local anesthetic into the throat. For some patients, the doctor may also administer conscious sedation to help them relax and reduce discomfort during the examination. Patients continue to breathe normally throughout the procedure.
2. Inserting the Ultrasound Probe
The patient lies on the left side, and the nurse places a mouth guard to protect both the teeth and the ultrasound probe. The cardiologist then gently guides the ultrasound probe through the mouth and into the esophagus. Throughout the procedure, patients continue to breathe normally.
3. Examining the Heart
The cardiologist examines the heart from multiple angles and evaluates its structure and function. The examination also includes capturing detailed images of the heart valves, chambers, blood flow, and nearby blood vessels to support diagnosis and treatment planning.
4. Recovery and Observation
After completing the examination, the cardiologist carefully removes the ultrasound probe. The medical team then monitors the patient for a short period before allowing them to go home or continue with the planned treatment. The examination itself usually takes about 30–45 minutes, while the entire visit, including preparation and recovery, typically takes 1–2 hours.
What Does a TEE Test Feel Like?
Many patients worry that a TEE test will be painful. In most cases, the examination causes only temporary discomfort rather than significant pain. A local anesthetic numbs the throat, and sedation helps patients stay relaxed throughout the procedure.
During and after the examination, patients may experience:
- Mild pressure in the throat as the ultrasound probe passes through the esophagus.
- A temporary gagging sensation, especially at the beginning of the procedure.
- A mild sore throat that usually improves within a day.
- Drowsiness or fatigue for several hours because of the sedative.
Although most patients recover without any problems, they should contact their doctor if they experience severe chest pain, difficulty swallowing, persistent bleeding, fever, or trouble breathing after returning home.
Possible Side Effects and Risks of a TEE Heart Test
A TEE heart test is generally safe. However, like other medical procedures, it may cause some side effects or complications, although serious problems rarely occur.
Possible side effects and risks may include:
- Sore throat or throat irritation after the examination.
- Injury to the teeth or gums, especially if the patient has loose teeth or dental problems.
- Minor bleeding from the mouth, throat, or esophagus.
- Temporary changes in heart rhythm during or after the examination.
- Reactions to sedation, such as breathing problems, nausea, or prolonged drowsiness.
- Injury or perforation of the esophagus, which occurs very rarely.
Patients should contact a doctor immediately if they experience severe chest pain, difficulty swallowing, persistent bleeding, fever, trouble breathing, or worsening symptoms after returning home.
What to Expect After a TEE Test
After a TEE test, most patients can go home and rest on the same day. To support a safe recovery, patients should follow a few simple aftercare instructions:
- Avoid eating or drinking until the throat numbness wears off. While the throat still feels numb, swallowing may not work normally and may increase the risk of choking.
- Start with small sips of water. If swallowing feels normal and there is no choking, patients can gradually start eating.
- Avoid driving after sedation. If the doctor gives medication to help the patient relax, a family member or caregiver should accompany the patient home.
- Expect mild throat irritation or a sore throat. This usually improves within 1–2 days.
- Seek medical attention immediately if severe chest pain, difficulty breathing, worsening difficulty swallowing, vomiting blood, or unusual bleeding occurs after the examination.
If a doctor has recommended a TEE test or if previous heart test results need further evaluation, speaking with a cardiologist can help clarify the next step. This examination is not a routine screening test, so a cardiologist will consider each patient’s symptoms, medical history, and test results before deciding whether it is appropriate.
At Vejthani International Hospital, our Cardiac Center provides comprehensive heart evaluations using advanced cardiac imaging technology, including TEE testing when clinically appropriate. Our cardiologists focus on accurate diagnosis, individualized treatment planning, and patient-centered care at every step.
FAQ
What are the benefits of a TEE test?
A TEE test helps cardiologists see certain heart structures in greater detail. It can support diagnosis, guide treatment planning, and help evaluate conditions such as heart valve disease, blood clots, infections, or structural heart abnormalities when more information is needed.
How long does a TEE test take?
A TEE test usually takes about 30-45 minutes. Patients may need additional time before and after the examination for preparation, sedation, monitoring, and recovery.
What are the possible side effects of a TEE heart test?
Common TEE heart test side effects may include a mild sore throat, throat irritation, drowsiness, or fatigue from sedation. Serious complications are rare, but patients should contact a doctor if they develop severe chest pain, difficulty swallowing, bleeding, fever, or trouble breathing.
What is a TEE?
TEE stands for Transesophageal Echocardiography. It is a specialized ultrasound examination that allows cardiologists to view the heart from the esophagus, which sits directly behind the heart.
How does a TEE procedure work?
During a TEE procedure, a cardiologist gently guides a thin ultrasound probe through the mouth and into the esophagus. The probe then captures detailed images of the heart valves, chambers, blood flow, and nearby blood vessels.
For more information, please contact
Cardiac Center, Vejthani International Hospital
Call: (+66)2-734-0000 Ext. 5300
English Hotline: (+66)85-223-8888
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