Oesophageal Manometry in Hong Kong

What manometry measures

A thin, flexible pressure-sensing catheter is usually passed gently through a nostril into the oesophagus and stomach. The team then asks you to swallow small amounts of water, sometimes in a series of different positions or patterns, while sensors record pressure and coordination. The test can help investigate difficulty swallowing, food sticking, regurgitation or a suspected movement disorder. It may also be used to assess oesophageal function as part of reflux investigations or before selected treatments. Your doctor interprets the measurements with your symptoms and other test results, rather than using one pressure reading alone.

Benefits, risks and limitations

Manometry measures function; it does not take pictures of the lining, diagnose every cause of swallowing difficulty or obtain a biopsy. Gastroscopy and manometry therefore provide complementary, not interchangeable, information. Passing the catheter can cause temporary watering eyes, gagging, a stuffy feeling, or mild nose or throat discomfort; minor irritation or a small nosebleed can occur. The test is generally performed while you are awake so that you can swallow as requested, and staff can pause to help if you are uncomfortable. The exact method and length vary with the protocol and your needs.

Preparation and follow-up

When arranging the test, tell the team about medicines, allergies, nasal blockage or surgery, bleeding problems, and any difficulty swallowing liquids. Some medicines or food may affect measurements, but whether to adjust them and any fasting period must be specified for your individual appointment; do not make changes on your own. Ask what clothing or support is useful and whether you need someone to accompany you. Most people can leave after the procedure, but follow the team’s advice about resuming food, drink and medicines, and ask when and how your results will be explained. Manometry is not a swallowing X-ray: it records pressure and timing, while a contrast swallow study shows movement and shape on imaging. Your doctor may use one or both depending on what needs clarifying. During the test, slow breathing and following the swallowing prompts can help the measurements; tell staff if you need a pause, and do not force a swallow that feels unsafe. The catheter is removed at the end and is not left in place. Mild nose or throat irritation generally settles, but the team should know if you have persistent bleeding or worsening discomfort. Ask whether the results will be discussed at a separate visit and how they may affect next steps, since a manometry pattern is interpreted alongside symptoms and other findings rather than as a stand-alone diagnosis.

Understanding your results

Pressure patterns during repeated swallows can suggest impaired relaxation, weak contractions or spasm. The findings are interpreted with symptoms, endoscopy and other tests: manometry does not show the oesophageal lining or explain every cause of swallowing difficulty.

Professional references

• ACG · Esophageal physiologic testing
• ASGE · Oesophageal manometry