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What is a sphincter injury?

A sphincter injury refers to any sort of tearing or damage to the anal sphincter, and arrangement of the pelvic floor muscles around the anal canal. There are two of these muscles – the internal and external sphincters. They both share a similar ring-like shape.

The internal muscle is involuntary, meaning that it contracts and relaxes on its own. The external muscle sits on the outside of the anal canal and is a voluntary and involuntary muscle, so can be contracted and relaxed consciously, as needed.

Both of these muscles control the flow of bowel movements. However, when damaged, they may become weaker and less effective. As a result, the patient may lose control over their bowel movements, leading to sphincter injury symptoms, such as accidental bowel leakage.

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What causes a sphincter injury?

Childbirth-related sphincter injuries may be related to vaginal deliveries, as well as assisted births using vacuums or forceps. Those who deliver larger babies are more likely to suffer these injuries due to added weight and pressure on the perineum, which may lead to tearing. Women who have either a rapid or prolonged second stage of labour are also more likely to have sphincter injuries.

Unfortunately, these injuries are not always preventable. However, patients benefit from being aware of the possible risks ahead of time.

How is a sphincter injury diagnosed?

History and physical exams are conducted to diagnose these injuries. The history exam focuses on learning about the patient’s obstetrical history, any history of anorectal surgery or injury, and their bowel habits or ability to control the passage of gas and stool.

Physical exams involve visual inspections of the anus, as well as digital examnations of the perineum and anal canal. Additional tests, like anal manometry tests to measure pressures within the anal canal, and endoanal ultrasounds to image the sphincter muscles, may be necessary.

Early diagnosis is crucial to commence treatment promptly and minimise the patient’s symptoms and suffering.

What is an obstetric anal sphincter injury (OASI)?

An obstetric anal sphincter injury (OASI) is an anal sphincter injury caused by the process of childbirth. More specifically, these injuries tend to be classed as either third- or fourth-degree perineal tears, caused by excessive pressure and stretching of this region as the baby emerges, or related to repeated pushing or the insertion of instruments.

What are the long-term effects of OASI?

Patients may find that they lack the control over their bowels that they previously had, which can mean they are not able to delay bowel movements and have to rush to the toilet more regularly.

Some also experience leakage of urine (incontinence), as well as anal leakage of gas or stool, and some may struggle with painful constipation on a recurrent basis.

There are also psychological effects tied to these symptoms. Patients may struggle with feelings of shame, anxiety, reduced quality of life, and sexual dysfunction connected to their anal sphincter injury. Prompt, proper treatment and emotional support are vital elements for recovery.

How is a sphincter injury treated?

Treatment options range from relatively mild, conservative approaches, such as pelvic floor exercises, medication, and diet adjustments, to specialised physiotherapy, which is the mainstay of treatment and is usually all that is needed in the vast majority of cases. Surgical repair of the sphincter muscles is rarely required.

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Sphincter injury aftercare

Practising good hygiene is crucial after an anal sphincter injury, keeping the area clean and dry. Consider making dietary adjustments, such as increasing fibre intake to help soften stools, and staying hydrated. Patients are typically discharged from the hospital with stool softeners and pain-relieving medication, as needed.

It is also crucial to seek a specialist’s support and treatment recommendations, as well as possibly psychological support, during your recovery. Recovery times vary, depending on the severity of the injury and the treatment plan followed.

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Strengthening the muscles after sphincter injury – pelvic floor exercises

Pelvic floor exercises are a critical component of recovery of function of the anal sphincter after childbirth. These muscles stretch from the pubic bone to the base of the spine and maintain the position of the bowel, bladder, and womb, while also aiding in bladder and bowel control. Bladder problems and urinary incontinence are also common after childbirth, and pelvic floor exercises can play an essential role in managing these symptoms.

Learning to control these muscles and perform pelvic floor exercises can be challenging at first, which is why it is recommended that a specialist women’s health physiotherapist guide patients.

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