Transoesophageal echocardiogram preparation

Overview

A transoesophageal echocardiogram (TOE) is a special ultrasound scan that uses a small flexible probe passed gently down your throat into your food pipe (oesophagus) to get detailed images of your heart. It's done to check heart valves, find blood clots, or look for infection in the heart. Preparing properly helps make the test safer and more comfortable.

A transoesophageal echocardiogram is a fairly common test for certain heart conditions, especially when clearer images are needed than from a standard echocardiogram (ultrasound on the chest).

It is recommended for people who have had a stroke or transient ischaemic attack (mini-stroke) to look for a heart source of blood clots, those with suspected heart valve infections (endocarditis), or those with abnormal heart structures that need closer examination.

Symptoms

Common symptoms

• Mild sore throat after the test – usually goes away within a day.
• Feeling drowsy or dizzy for a few hours from the sedation.
• Nausea or gagging sensation as the probe is passed (you'll be given a throat spray to numb the area).

Symptoms in children

• Young children may be given general anaesthesia (fully asleep) for a TOE, so they won't feel or remember anything.
• After the test, children may have a sore throat or be irritable for a short time.

Symptoms in older adults

• Older adults may be more sensitive to sedation, so the medical team will give a lower dose and monitor closely.
• There is a slightly higher risk of complications such as low blood pressure or breathing problems, but these are rare.

Causes

Main causes

• You may need a TOE because a standard echocardiogram couldn't get clear enough pictures of your heart valves, the back of your heart, or the aorta (main artery).
• It is often done to find the source of blood clots in people who have had a stroke without a clear cause.
• Doctors may order a TOE if they suspect an infection of the heart valve (endocarditis) or a hole in the heart.

Risk factors

• Having swallowing problems or a history of oesophageal conditions like strictures (narrowing) or varices (enlarged veins) can make the procedure riskier.
• Taking blood-thinning medications (anticoagulants) may increase bleeding risk, but you can still have the test with special care.
• If you have a known allergy to sedation or anaesthetic throat spray, tell your healthcare team.

When to see a doctor

See a doctor urgently if:

• If you develop a high fever, severe chest pain, or trouble breathing after the test – seek medical attention right away.
• If you cough up blood or have severe throat pain that won't go away.

Book a routine appointment if:

• If you have any ongoing discomfort like a mild sore throat or nausea, speak to your doctor or the hospital by phone.
• If you have questions about taking your regular medicines before the test, ask your healthcare provider.

Diagnosis

A transoesophageal echocardiogram is itself a diagnostic test. The preparation involves making sure you are safe and comfortable. Before the test, you'll have a health check, including blood tests, an ECG (electrical recording of your heart), and a discussion about your medicines.

Tests that may be done

• Blood tests to check for infection or bleeding risk.
• An electrocardiogram (ECG) to check your heart rhythm.
• A physical exam by the doctor or nurse to listen to your heart and lungs.

What to expect at your appointment

On the day, you will change into a hospital gown and lie on your side. A nurse will put a small needle in your arm to give sedation. You'll have a spray to numb your throat. The doctor will gently pass the probe into your food pipe – you might feel pressure but not pain. The whole scan takes about 30 to 45 minutes. After, you rest for 1 to 2 hours before going home. You cannot drive or operate machinery for 24 hours because of the sedation.

Treatment

Preparing for a transoesophageal echocardiogram is straightforward. You will be given clear instructions by your hospital. The goal is to make sure your stomach is empty to reduce choking risk, and that you are well enough for sedation.

Self-care at home

• Stop eating and drinking 6 hours before the test – you can usually have small sips of water up to 2 hours before, but check with your hospital.
• Arrange for a responsible adult to drive you home after the test because you will be drowsy from sedation.
• Take your regular medicines as usual unless your doctor tells you otherwise, especially for blood pressure or heart conditions.

Medical treatments

In some cases, you may be given a sedative medicine through a vein to help you relax, and a local anaesthetic spray on your throat to numb the gag reflex. These are standard and help make the procedure comfortable. No specific drug names or doses are recommended here – follow your doctor's advice.

When is surgery considered?

A TOE is not a surgery. However, if the test finds a serious condition like a large blood clot or a heart valve infection, you may need surgery or other treatments later. Your doctor will discuss those options with you.

Living with this condition

You don't 'live with' the preparation – it's a one-time process. After the test you can return to normal activities the next day, but avoid heavy lifting or straining for 24 hours if you had sedation.

Lifestyle tips

• Avoid alcohol for 24 hours after the test, as it can interact with sedation.
• Do not drive, operate machinery, or make important decisions until the next day.

Diet and exercise

You can eat and drink normally once the throat numbness wears off (about 1 to 2 hours). Start with cool, soft foods if your throat feels scratchy. Resume exercise when you feel ready, usually the next day.

Mental health and emotional wellbeing

Some people feel nervous or anxious before a TOE because of the throat probe. This is normal. Tell the medical team – they can give extra support or reassurance. Deep breathing and talking to a loved one can help.

Prevention

A TOE is a diagnostic test, not a condition you can prevent. However, the need for a TOE might be avoided if a standard echocardiogram gives clear enough images. Good heart health (managing blood pressure, cholesterol, and avoiding smoking) can reduce the chance of needing this test for some conditions like stroke or valve disease.

Vaccines

There are no vaccines to prevent the need for a TOE. However, getting vaccines like the influenza and pneumococcal vaccines can help prevent infections that might lead to heart valve problems.

Screening programmes

There is no separate screening for TOE. Your doctor will decide if you need this test based on your symptoms and other tests.

Complications

If left untreated

• If you don't follow the preparation instructions (like not fasting), the test may be cancelled or there is a risk of vomiting and inhaling stomach contents (aspiration), which can cause pneumonia.
• Ignoring symptoms that suggest a problem after the test (like a fever) could lead to a missed infection or other complication.

Long-term outlook

For most people, a transoesophageal echocardiogram is safe and provides vital information that helps guide treatment. The risks are low when you follow preparation guidelines. After the test, you will be monitored and given clear aftercare instructions. With proper preparation, the procedure is well tolerated, and the benefits usually far outweigh the very small risks.

Find support

Local organisations

• British Heart Foundation ↗ · UK

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