Acquired Anorectal Disorders Flashcards
What is a hemorrhoid?
Hemorrhoidal veins are arteriovenous connections which lie in the submucosal space above the dentate line.
There are three hemorrhoidal venous plexi.
They are located in the left lateral, right anterior, and right posterior positions.
During periods of high venous pressure, these veins can become engorged.
How do patients with hemorrhoids present?
Hemorrhoids are an extremely uncommon finding in healthy young children.
About a third of children with portal hypertension are affected by anorectal varices, but these are often asymptomatic.
Parents may report a “protrusion” from the anus, but it is important to differentiate hemorrhoids from other similarly presenting pathology such as rectal prolapse and rectal polyps.
If hemorrhoids are symptomatic, painless hematochezia is a typical presenting symptom.
Adolescents may develop hemorrhoids which present more classically like those seen in adults, including painful thrombosed external hemorrhoids or prolapsing internal hemorrhoids.
How are hemorrhoids classified?
Hemorrhoids are classified as internal or external, depending on their relation to the dentate line.
Internal hemorrhoids arise from the superior hemorrhoidal plexus above the dentate line, and are insensate, while external hemorrhoids arise from the inferior hemorrhoidal plexus and have associated pain.
Internal hemorrhoids can be further classified by the extent of their prolapse (Table 35.1).
What are the initial treatment options for hemorrhoids?
Hemorrhoid management depends on the etiology. In children with anorectal varices secondary to portal hypertension, treatment of the underlying hepatic pathology is necessary.
In older children, hemorrhoids are likely due to prolonged constipation.
Management of this should focus on increasing dietary fiber and water.
Stool softeners can be used as adjuncts, but overly loose stools can aggravate symptoms.
Behavioral changes such as promotion of healthy toilet habits (reduction of prolonged toilet time and avoidance of reading or using electronic devices while stooling) are encouraged.
Sitz baths may help relieve symptoms.
If medical management fails, what are the other options for hemorrhoid treatment?
Internal Grade II or III hemorrhoids recalcitrant to medical management can be treated with rubber band ligation.
In this procedure, a hemorrhoid banding ligator is used to launch a rubber band around the base of the hemorrhoid and results in hemorrhoidal ischemia and necrosis.
It is important to avoid banding external hemorrhoids.
Their location below the dentate line renders them highly sensitive and banding will cause extreme pain from the ischemia.
Other techniques including injection sclerotherapy and infrared coagulation have been employed, but are less common.
Should medical management and non-operative procedures fail, surgery can be considered.
The majority of hemorrhoidectomies are performed by resecting the hemorrhoidal column free from the internal anal sphincter up to its vascular pedicle, which is then ligated.
Some practitioners recommend avoiding resection of more than two hemorrhoidal columns at once as this may increase the risk of anal stenosis.
Stapled hemorrhoidopexy is another option, which may be less painful as the incision is kept above the dentate line; however, this approach is less popular as it is associated with a higher stricture risk.
Are there any concerns practitioners should keep in mind when working up children with hemorrhoids?
Rectal prolapse is often confused with hemorrhoids and vice versa.
Rectal polyps can also mimic prolapsed internal hemorrhoids.
Other rare diagnoses such as rectal hemangioma, rectal duplication and venous malformation of the anal canal can also occur.
A thorough physical examination is pertinent to ensure an accurate diagnosis.
Are there any long-term complications from hemorrhoid management?
Described complications are limited to the postoperative period.
Rectal stenosis from overly aggressive hemorrhoid resection, pelvic sepsis from infection, and fecal incontinence from sphincter complex injury are among these.
What is an anal fissure?
An anal fissure is a tear in the anoderm, or the squamous epithelial mucosa distal to the dentate line.
Anal fissures can be painful and associated with the passage of bloody stools.
At what age do anal fissures occur?
Anal fissures most commonly occur in children at the time of introduction to solid foods.
The stool consistency subsequently changes from loose and seedy, to formed.
The passage of harder stools leads to the tear, subsequent pain and possible stool retention.
This may result in harder and bulkier stools which worsen the tear and may prevent healing.
What are the symptoms associated with anal fissures?
Anal fissures tend to be painful, resulting in crying during defecation.
Often, they are identified after finding bright red blood in the stool in small volume.
How do I diagnose an anal fissure?
Anal fissures can be diagnosed clinically.
The buttocks and anoderm should be spread apart and the anus inspected.
The vast majority of anal fissures are in the posterior midline.
Are there medical conditions I should be concerned about when identifying an anal fissure?
Anal fissures occurring in older children and those that are not in the midline should raise concern for inflammatory bowel disease.
Anal malignancy is extremely rare in children, but should be considered in non-healing fissures in older children.
Additionally, the presence of concomitant bruising or other trauma should raise concern for the possibility of non-accidental trauma.
What is the medical management for anal fissures?
The vast majority of anal fissures heal without any surgical management.
The mainstay of medical management for anal fissures is relief of constipation and loosening of the stools (Fig. 35.1).
Increasing water consumption and fiber intake are central to this management.
Stool softeners can be helpful, but should be used cautiously since overly loose stools can aggravate the fissure.
Regular sitz baths can also be helpful.
If dietary changes fail, are there any non-surgical procedures that should be trialed prior to more invasive methods?
Numerous methods have been reported to accelerate fissure healing.
Topical anesthetic creams (ex EMLA), topical nitroglycerin ointments, and topical calcium channel blockers have been utilized to assist with fissure healing, however high recurrence rates have been reported.
Are there surgical procedures available for anal fissures?
If the above therapies fail, surgical options may be considered.
It is important to consider alternative diagnoses among these recalcitrant fissures.
Numerous procedures have been reported for the management of anal fissures.
Anal dilation, the injection of botulinum toxin (Botox), and lateral internal sphincterotomy have all been described, but with mixed results.
Botulinum toxin injections have temporary effects, with reduced risk of long-term incontinence, however lateral internal sphincterotomy has been shown to have the lowest long-term rate of recurrence.
Fissurectomy, or the removal of the fissure with primary closure, has been reported with reasonable outcomes when combined with Botox to prevent recurrence.
