What is Anorectal Manometry?
Anorectal manometry is a specialised test used to evaluate how the muscles and nerves of the rectum and anus work together during a bowel movement.
These muscles play an important role in holding and passing stool. If they are too weak, too tight or do not coordinate correctly, patients may experience constipation, difficulty emptying the bowel or problems controlling bowel movements.
During the test, a small flexible catheter with a balloon is gently inserted into the rectum. Sensitive equipment measures muscle pressure, sensation and reflexes to help determine how effectively the anorectal muscles are functioning.
Why Anorectal Manometry is done
Your gastroenterologist may recommend anorectal manometry to investigate:
- Chronic or unexplained constipation
- Difficulty passing stool
- A feeling of incomplete bowel emptying
- Excessive straining during bowel movements
- Faecal incontinence or difficulty controlling bowel movements
- Suspected pelvic floor or defecation disorders
- Problems with coordination of the anal and rectal muscles
The information obtained can help your doctor determine the cause of your symptoms and select the most appropriate treatment.
How to prepare
Preparation is usually simple. Your care team will provide specific instructions, which may include:
- Using an enema before your appointment so that the rectum is empty
- Following instructions regarding eating and drinking before the test
- Informing us about all medications you currently take
- Bringing your referral and relevant previous test results
- Letting us know about previous rectal, anal or pelvic surgery
Anorectal manometry generally does not require sedation or anaesthesia.
During the test & your results
You will usually lie comfortably on your side while a small, flexible catheter is gently inserted into the rectum. The catheter contains sensors and a small balloon.
During the examination, you may be asked to squeeze, relax or bear down as though having a bowel movement. The balloon may also be gently inflated to assess rectal sensation and reflexes.
The test typically takes around 30 minutes and does not normally require sedation. Afterward, you can generally return to your usual activities.
Your gastroenterologist will review the pressure, sensation and coordination measurements and discuss what they reveal about your bowel function and any recommended treatment or further testing.
