Manometry is a diagnostic procedure that helps to identify the causes of digestive system disorders. If you experience difficulty swallowing, recurrent chest pain or problems with bowel movements, this test can provide answers to the underlying causes of your symptoms. Manometry is particularly useful for patients who have been searching for the true cause of their symptoms for months or years.
This diagnostic method is based on precise pressure measurements, which enable doctors to gain a detailed understanding of the muscular function of the digestive system. As technology has advanced, manometry has become increasingly accurate and more comfortable for patients.
In this article, we explain in detail what manometry is used for, which conditions it can help diagnose, how the test is carried out, and what to expect if your doctor recommends this method to you.
What exactly is manometry?
Manometry is a diagnostic procedure that measures the muscular function and pressure conditions in specific sections of the digestive system. During the examination, a thin catheter containing sensors is inserted into the area to be examined. These sensors continuously measure the pressure, thereby providing an accurate picture of how the muscles are functioning.
Manometry can be applied in two main areas:
Oesophageal manometry: It examines the muscular function of the oesophagus, with particular regard to the process of swallowing and the function of the sphincter muscles.
Rectal manometry (anorectal manometry): It assesses the function of the anus and the surrounding muscles, which helps in the diagnosis of bowel problems.
Both tests can be carried out on an outpatient basis, without the need for hospital admission, and usually take 30–60 minutes.
Oesophageal manometry: when is it necessary?
Oesophageal manometry is primarily recommended for patients who experience difficulty swallowing, chest pain or reflux disease. The test helps to identify the motility disorders responsible for these symptoms.
What conditions does oesophageal manometry detect?
Oesophageal manometry plays a key role in the diagnosis of a number of conditions:
Achalasia: This is a rare condition in which the lower oesophageal sphincter is unable to relax properly, preventing food from passing into the stomach. Manometry shows that the sphincter does not relax properly and that the body of the oesophagus does not exhibit normal contractions. High-resolution manometry (HRM) can distinguish between three types of this condition, which is important for planning treatment.
Oesophageal spasm (diffuse oesophageal spasm): Patients may experience sudden, painful spasms in the chest area. During manometry, these spasmodic, irregular muscle contractions are clearly visible.
Hiatus hernia: High-resolution manometry helps to identify whether the distance between the diaphragm and the lower oesophageal sphincter is greater than 2 cm, which suggests a hiatal hernia.
Pre-operative assessment for reflux disease: If surgery is planned for gastro-oesophageal reflux disease, manometry helps to rule out other motility disorders that might affect the outcome of the operation.
The course of the investigation
During oesophageal manometry, you can expect the following:
Preparation: You must not eat or drink anything for at least 6 hours before the test. You must tell the doctor if you are taking any anticoagulants or other medicines.
Insertion of the catheter: A thin, flexible catheter is inserted through the nostril into the oesophagus. This may be slightly uncomfortable, but it is not painful. Numbing the nose with a local anaesthetic can make insertion easier.
The measurement process: During the test, you will need to swallow several times whilst the catheter measures changes in pressure. The person conducting the test will tell you when to swallow.
Conclusion: After the examination, the catheter will be removed and you will be able to go home. You will not need to be kept under observation.
What do the results mean?
During manometry, several important parameters are measured:
Integrated Relaxation Pressure (IRP): This indicates the extent to which the lower oesophageal sphincter is able to relax during swallowing. If this value is high, achalasia or another outlet obstruction may be present.
Distal Contractile Integration (DCI): It measures the strength of contractions in the oesophagus. Values that are too high or too low indicate motility disorders.
Distal latency (DL): This indicates the time that elapses between the start of swallowing and the contraction of the lower oesophagus.
Rectal manometry: help with bowel problems
Rectal manometry helps patients who suffer from chronic constipation, faecal incontinence or difficulty passing stools. The test reveals how the anus and the surrounding muscles function.
When does a doctor recommend this test?
Rectal manometry is particularly useful in the following cases:
Chronic constipation: If conventional treatments do not help, manometry can help determine whether the muscles are working in coordination during bowel movements.
Incontinence: The examination reveals whether the sphincter muscles are not strong enough or are not functioning properly.
Difficulty passing stools: For many patients, the problem is that anal pressure increases during the examination rather than decreasing.
Suspected Hirschsprung’s disease: This is a congenital condition in which certain nerves in the intestine are missing. Manometry helps to rule out or confirm this diagnosis.
The course of the investigation
Rectal manometry is less invasive than you might think:
Preparation: You will need to empty your bowels before the examination; this is sometimes facilitated by an enema. You do not need to fast.
Insertion of the catheter: A thin probe fitted with sensors is inserted into the rectum.
Measurements: During the examination, the doctor will ask you to tense or relax your muscles, or to try to act as if you were having a bowel movement. Sometimes a small balloon is also inflated in the rectum to test sensation and reflex responses.
Balloon deflation test: At the end of the test, you will need to empty a balloon filled with water. If this takes longer than one minute, it suggests that your pelvic floor muscles are not functioning properly.
Interpreting the results
Rectal manometry provides several important pieces of information:
Resting anal pressure: This indicates the baseline strength of the sphincter muscles. A low value may indicate incontinence.
Maximum anal pressure: The maximum pressure measured during contraction. This, too, indicates the strength of the sphincter muscles.
Rectoanal inhibitory reflex: Normally, when the rectum becomes full, the sphincter muscle relaxes automatically. If this reflex is absent, Hirschsprung’s disease may be suspected.
Pelvic floor muscle coordination: The test shows whether the muscles relax properly or remain tense during a bowel movement.
Modern technology: high-resolution manometry
In recent years, high-resolution manometry (HRM) has become widespread, representing a significant advance over the traditional method. This technology uses many more measurement points and presents muscle function using graphical representations (pressure topography).
The advantages of high-resolution manometry
A more accurate diagnosis: A more detailed pressure map helps to distinguish between different types of disease.
Visual representation: It displays the results on a colour-coded map, which makes them easier for the doctor to interpret.
Distinguishing between subtypes of achalasia: The HRM can identify three types of achalasia, which is important because each type requires a different treatment.
Minor measurement error: Multiple sensors provide a more accurate picture of how the muscles work.
How should you prepare for the examination?
Proper preparation is essential for a successful examination:
Before oesophageal manometry
Do not eat or drink anything for 6 hours before the examination
If you are taking any medication, discuss with your doctor whether you should stop taking it
Please wear comfortable clothing, as you will need to sit during the examination
If you are feeling particularly anxious, ask your doctor for a sedative
Before a rectal manometry
Please ensure you have emptied your bowels on the morning of the examination
You don’t need to be on an empty stomach
Comfortable clothing is recommended
If you are worried about the examination, discuss your concerns with your doctor
Risks and side effects
Manometry is a very safe procedure, but you may experience some minor discomfort:
In the case of oesophageal manometry:
Nosebleeds (rare)
Sore throat
Nausea
Cough
Mild chest discomfort
In the case of rectal manometry:
A slight discomfort
Cramp-like pain (rare)
Minor bleeding (very rare)
These symptoms usually subside within a few hours. If you experience more serious symptoms after the examination, contact your doctor immediately.
Frequently asked questions
Is the test painful?
Manometry is not a painful procedure, although it may be uncomfortable. You may feel some pressure when the catheter is inserted, but this does not cause any pain. If you find it too uncomfortable for any reason, please let the healthcare staff know.
How much does the test cost?
The cost of manometry varies and depends on the type of examination and the facility where it is carried out. In some cases, the costs are covered by the National Health Service; in others, you will have to pay some or all of the cost yourself. You should always enquire in advance about the exact amount.
How long does the examination take?
Oesophageal manometry usually takes 30–45 minutes, whilst rectal manometry takes around 20–30 minutes. Including preparation and the rest period afterwards, please allow 1–2 hours.
Will I get results straight away?
It takes a little time to analyse the results of the manometry test. The doctor will usually discuss the results of the test and the next steps with you within 1–2 weeks.
Will I need someone to accompany me?
In the case of oesophageal manometry, this is not necessarily the case, but if you are given a sedative, then yes. After a rectal manometry, you can usually go home straight away, even on your own.
What to do after the test?
You can resume your normal daily routine within a few hours of the manometry. Here are a few tips:
Drink lukewarm drinks if you have a sore throat
If you feel nauseous, start with light meals
Avoid strenuous physical activity on that day
If you have any unusual symptoms, please call your doctor
Next steps following diagnosis
If the manometry test reveals that you have a motility disorder, do not despair. There are many treatment options available:
Medication: Certain medicines can help to relax the muscles or improve their co-ordination.
Biofeedback therapy: This is a learning process through which you can learn how to consciously control your muscles. It is particularly useful for pelvic floor muscle dysfunction.
Surgical procedure: In more serious cases, such as achalasia, surgery may also be necessary.
Lifestyle changes: Changing certain eating habits and postures can also help.
Summary: Why is manometry important?
Manometry is a safe and informative diagnostic method that can provide answers to symptoms that have been troubling you for months or years. The test helps to:
To make an accurate diagnosis
Choosing the right treatment
Avoiding unnecessary operations
To improve your quality of life
If your doctor recommends a manometry test, do not be afraid to undergo this examination. Although it may be uncomfortable for a few minutes, the results can help find a solution to your symptoms. At Endomedix private clinics, manometry is carried out using state-of-the-art equipment, which provides accurate and reliable results, enabling doctors to plan the best course of treatment for you.
Remember: the first step towards resolving your symptoms is an accurate diagnosis. Manometry can help ensure that your symptoms are finally relieved and that you can return to your normal way of life.
