21 March 2019 What is an anorectal manometry? Anorectal manometry is an examination carried out to assess the capacity, muscle contraction strength and motility of the rectum and anus. How is an anorectal manometry performed? An anorectal manometry is done with the patient lying on their left side. A fine probe , connected to pressure recording equipment and a monitor, is introduced into the anus. The monitor displays graphics showing the movements of the rectum and anus in response to various manoeuvres carried out as part of the examination. These manoeuvres include measuring contractile force by asking the patient to cough or increasing the volume in the rectum using a balloon with increasing volumes of air. In this way it is possible to determine the muscle and sphincter function , and to find out how well they perform in simulated situations of defecation and retention. The test is not painful and no sedation is necessary. In which situations is anorectal manometry carried out? It is always for the doctor to decide whether there is a need for a particular test, depending on the individual characteristics of each person and their complaints or illness . As a general rule, anorectal manometry is indicated where there is a need to: Identify local causes of anal pain, constipation or bowel incontinence; Assess local sensitivity and the nerve pathways associated with the mechanism of defecation and its inhibition; Determining the effectiveness of previous surgical intervention. How long does an anorectal manometry take? An anorectal manometry takes, on average, about one hour. What are the limitations of anorectal manometry? Anorectal manometry is a technique that can miss lesions and diagnoses , even when the examination is carried out correctly. Are there any side effects, risks or complications associated with anorectal manometry? Anorectal manometry has no side effects, risks or complications. This article was written with the support of physicians and other clinical professionals from the Hospital da Luz network. The content published in the Health Guide is intended for the general public and is provided for informational and educational purposes only. It does not replace individual medical assessment, diagnosis, or personalized clinical advice from a qualified healthcare professional. The content is produced or reviewed by physicians and other healthcare professionals at Hospital da Luz and is based on the knowledge available at the time of publication or the most recent update, as indicated at the beginning of each item.
