Introduction
Anal stenosis is the narrowing of the anal canal, thus causing difficulty in passing stool. It is also known as an anal stricture. Ananl stenosis occurs due to the narrowing of the muscles, which leads to contraction and expansion for movement of the stool. The cause of this narrowing can be congenital malformation, venereal disease, or rectal infection. Symptoms may include pain during bowel movements, constipation, or bright red blood after the passing of stool.
What Is Anal Sphincter?
The anal sphincter is part of the body that maintains a closed seal that can be opened to remove body waste. The anal sphincter is strong enough to restrict the passage of any fecal material but at the same time sensitive enough to differentiate between liquid, gas, and solid.
Anal sphincter muscles are of two types that are internal and external anal sphincters.
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The internal anal sphincter is a thin, white muscle wrapped around the anal canal. It contracts during rest and relaxes. It also prevents small amounts of liquid and gas from escaping involuntarily. The internal anal sphincter is an involuntary smooth muscle that can not be controlled mentally.
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The external anal sphincter is a thick, red muscle that is voluntary. It is wrapped around the internal sphincter. It contracts/squeezes when a person feels the urge to go to the bathroom but can not. As it is voluntary, it can be controlled mentally.
How Does Food Waste Pass Out?
The food waste accumulates in the rectum gradually. The rectum is a flexible muscle pouch that is the last part of the large intestine. When sufficient waste is collected, there is an urge to go to the bathroom. Once the person sits on the toilet seat, the anal sphincter gets released, allowing the anal canal to empty. When the waste is released from the canal, the anal sphincter restricts and closes until the process has to be performed again.
What is Anal Stenosis?
Anal stenosis is a condition in which the anus gets narrowed. The anus is the site from which the poop is removed from the body. The medical term for this condition is anal stricture. The condition is observed more commonly among adults. This occurs as a result of a chronic disease or due to complications from surgery. This condition can be seen in babies. These are born with a narrow anus. This is a congenital issue called congenital anal stenosis.
The symptoms of this condition may vary from mild to severe. The main complaint is not being able to poop.
What Causes Anal Stenosis?
Narrowing of the anal sphincter can be due to many things, such as:
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Overuse of Laxatives: In cases of severe complications, laxatives are used to pass out stool easily. These laxatives can affect the anal sphincter with prolonged use and cause stenosis.
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Sepsis: A severe blood infection that can compromise organs and muscles in the body.
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One of the complications faced after the surgical procedure is scarring.
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AIDS (acquired immune deficiency syndrome) and venereal diseases (sexually transmitted diseases).
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There can be blood loss from a specific part of the body.
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The microorganism Entamoeba histolytica may cause an infection.
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Inflammatory bowel disease is a disorder that leads to colon and small intestine inflammation.
What Are the Symptoms of Anal Stenosis?
The symptoms of anal stenosis vary depending on its severity.
The symptoms observed are:
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Painful bowel movements.
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Constipation: difficulty passing a normal stool.
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Stools were removed in the form of small pellets.
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Rectal bleeding: bright red blood seen in the toilet after passing out stool.
How to Diagnose Anal Stenosis?
The steps involved in diagnosis are different for children and adults.
Diagnosis of congenital anal stenosis (CAS): The signs are detected among newborns while examining the baby. They may involve a digital rectum examination. Healthcare providers may suspect CAS when the baby does not meconium within 24 to 48 hours after the birth or if their first poops are found to be narrow. Confirmatory tests for CAS include:
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Abdominal ultrasound.
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Barium enema.
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Computed tomography scan.
Diagnosis of anal stenosis among adults: The diagnosis is done by taking a medical history and symptoms. The following tests are done. These include:
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Digital rectal examination.
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Anoscopy.
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Proctoscopy.
What Is the Treatment of Anal Stenosis?
The best treatment for anal stenosis is prevention. Some preventive measures are:
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Use stool softeners or emollient laxatives, adding moisture to the stool.
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Intake more fiber supplements in the diet, as it facilitates easy passing of stool.
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Sphincterotomy: Procedure of cutting the anal sphincter muscle to open the anal canal.
If the condition still occurs, the following treatment modalities can be performed:
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Anoplasty is a surgical procedure to relieve stenosis. The anus is reconstructed with this procedure.
Procedure:
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General anesthesia is administered to the patient.
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The narrow, strictured anus is enlarged and stretched.
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Skin flaps are used to reconstruct the anus.
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If any fistula is present, it is closed surgically.
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The anus restores its normal functioning after the treatment.
Complications:
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Dehiscence: After the anoplasty, the entire rectal repair can break down, which is known as dehiscence. This can be due to excessive tension or ischemia.
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Strictures: Pressure due to surrounding muscles, tension, and ischemia can develop strictures in the region of anoplasty.
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Mucosal Prolapse: After anoplasty, the mucosa can prolapse in the perineum and cause irritation at the site. It can also cause underwear staining due to excess mucus secretion.
Precautions After the Surgery:
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Avoid sitting directly on the surgical area, which is the anus.
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Proper diet intake with good fiber content.
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Avoid lifting heavy weights, significantly more than 20 lbs, at least for ten days.
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Drink plenty of water, at least eight glasses a day.
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Before consuming blood thinners or aspirin, the doctor should be consulted.
What Are the Complications of Anal Stenosis?
The complications of anal stenosis are based on the symptoms. These include:
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Sores: Sores may develop around the anus if the person suffers fecal incontinence.
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Fecal Impaction: If an individual suffers chronic constipation, fecal impaction may develop.
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Dehydration: If a baby has congenital anal stenosis (CAS), they may develop dehydration.
Which Disease Is Similar to Anal Stenosis?
Perianal Crohn’s Disease: It is an autoimmune disease in which there is inflammation around the anus. These conditions can lead to fissures, skin tags, fistulas, and abscesses around the anus.
Symptoms resemble anal stenosis as they are:
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Pain in bowel movements.
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Itching around the anus.
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Pus discharge in cases of abscesses.
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Bleeding from the rectum.
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Bowel inconsistency and constipation.
What Is the Prognosis of Anal Stenosis?
When the treatment is done to correct anal stenosis, the anal size returns to the standard size. This relieves the symptoms of anal stenosis, but in turn, it causes inflammatory bowel disease for life. This situation can be solved by getting healthcare providers' help to know how to do it. Babies can be treated for anal stenosis, and the treatment can ease the problem. When they start to grow, they may develop toddler constipation later.
Conclusion
Anal stenosis is the narrowing of the anal canal due to constriction of its muscles. This can be due to different reasons, such as overuse of laxatives, sepsis, sexually transmitted diseases, or surgical complications. The symptoms include difficulty passing stools and pain in bowel movements. There can also be traces of blood in the toilet after passing out stool. The treatment consists of preventive measures and surgical procedures. The surgery performed to cure stenosis is anal reconstruction with the help of skin flaps.
