powerpoint: anal and perianal disorders
TRANSCRIPT
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ANAL AND PERIANAL DISORDERS
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ANATOMY
Anal canal- 4 cm. long Surrounded by the anal sphincter
mechanism Except during defecation, its lateral walls
are kept in apposition by the levatores ani muscles and the anal sphincters
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ANATOMY
Upper half of the anal canal is lined by columnar epithelium
Lower half- stratified squamous epithelium (modified skin)
Dentate line- the junctions of two types of mucosa
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THE UPPER HALF
Lined by columnar epithelium Thrown into vertical folds- anal columns Joined together at their lower ends by
small semilunar folds- anal valves At the base of each valve are small
sinuses into which open 4-8 anal glands Some of these glands reach the
intersphincteric spaces and lead to abscess formation
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THE LOWER HALF
Lined by stratified squamous epithelium which gradually merges at the anus with the perianal epidermis
There are no anal columns Nerve supply is from somatic inferior
rectal nerve Sensitive to pain, temperature, touch
and pressure
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ANAL SPHINCTER MECHANISM
Internal sphincter- thickened continuation of the rectal wall smooth muscles- involuntary sphincter
External sphincter- three parts: subcutaneous, superficial and deep
Puborectalis muscles: cause the rectum to join the anal at an acute angle
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ANATOMY
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ANATOMY
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ANATOMY
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ANATOMY
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PUBORECTAL SLING
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COMMON ANAL SYMPTOMS
ANAL BLEEDING ANAL PAIN PERIANAL ITCHING “SOMETHING COMING DOWN” PERIANAL DISCHARGE
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ANAL BLEEDING
Bleeding piles
Anal fissures
Ulcerated anal carcinoma
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ANAL PAIN
ANAL FISSURE
COMPLICATED PILES
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PERIANAL ITCHING
LOW-GRADE FUNGAL INFECTION
BACTERIAL INFECTION
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“SOMETHING COMING DOWN”
PROLAPSED PILES
RECTAL PROLAPSE
PEDUNCULATED ANAL POLYP
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PERIANAL DISCHARGE
FISTULA-IN ANO
PROCTITIS
VILLOUS ADENOMA
ULCERATED ANAL CARCINOMA
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HEMORRHOIDS
Vascular swellings involving the internal or external venous plexuses
Extremely common- constipation Lack of fiber in the modern ”civilized” diet Unknown in underdeveloped countries
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PATHOGENESIS
Excessive venous enlargement at the lower ends of the anal mucosa columns
Usually located at the 3, 7, 11 o’clock positions Caused by straining to pass small hard stools Increased intraabdo. Pressure inhibits venous
return- venous distension Bulging mucosa is dragged distally by the hard
stools Persistent straining at stool causes the pelvic
floor to downwards, extruding the anal mucosa
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CLINICAL CIRCUMSTANCES
Chronic constipation Chronic diarrhea Pregnancy Portal hypertension
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PILES
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INTERNAL PILES
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EXTERNAL PILE
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SYMPTOMS
Perianal irritation and itching Aching discomfort and pain exacerbated
by defecation Hemorrhoidal prolapse Rectal bleeding
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CLASSIFICATION
First degree piles never prolapse
Second degree piles prolapse during defecation but then return spontaneously into the anal canal
Third degree piles remain outside the anal margin unless replaced digitally
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COMPLICATIONS
Any piles may bleed from stool trauma during defecation
Large piles may thrombose if they prolapse and their venous return is obstructed by sphincter tone
Venous infarction and ulceration Sphincter tone and spasm aggravate the
pain at defecation and prolapse
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PROLAPSED BLEEDING HEMORRHOIDS
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DIAGNOSIS
Perianal examination Skin tags Perianal orifices
PR examination palpable, soft folds Rule out malignancy
Proctoscopy Internal piles bulging into the lumenThrombosed piles- congested purplish mass at the
anal margin, tight spasm makes PR exam. PainfulStrangulated piles- necrotic, ulcerated mass
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CONSERVATIVE MANAGEMENT
High fiber diet Avoid constipation, straining at
defecation, avoid on the lavatory reading Prolapsd piles should be replaced
digitally after defecation Overuse of creams causes maceration
of the perianal skin
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SURGICAL TREATMENT
Injections with irritant solution- fibrotic reaction- atrophy of the piles
Banding- application of Baron’s band
Hemorrhoidectomy- surgical excision
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NO PILES
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ANAL FISSURE
Longitudinal tear in the mucosa and skin of the anal canal
Caused by passage of a large, constipated stool
Located nearly in the midline of the posterior anal margin
The fissure causes sphincter spasm and acute pain defecation, which persists for up to an hour
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ANAL FISSURE
Fresh bleeding at defecation- the bleeding is slight and noted on the toilet paper
History is diagnostic of an anal fissure PR examination is impossible due to
pain Treatment- anal stretch, internal
sphincterotomy
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SYMPTOMS
Perianal pain, exacerbated by defecation Minor anal bleeding
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PERIANAL ABSCESSES
Presentation: perianal pain, tenderness and swelling
Infection of the anal gland which drain at the base of the anal columns along the dentate line
Duct obstruction by feces may initiate the infection
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PERIANAL ABSCESS
Infection tends to spread laterally through the external sphincter
Ischiorectal abscess- Pararectal abscess
Early diagnosis- oral antibiotics treatment may abort the infection
Established abscesses require incision and drainage
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PERIANAL ABSCESS
Large ischiorectal abscess requires packing to keep the neck of the cavity open
Granulation tissue gradually fills the space from its depths
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PILONIDAL ABSCESS
Occurs in the skin of the natal cleft
Incision and drainage followed by further excision
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PILONIODAL ABSCESSTREATMENT
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ANAL FISTULA
Develops as a complication of perianal, ischiorectal, pararectal abscesses
Fistula tracks from the lower rectum or upper anal canal through the abscess site to the perianal skin at the point of previous drainage
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ANAL FISTULA
Intermittent discharge in the perianal region
A small papilla of granulation tissue is seen on the skin within 2-3 cm. of the anal margin
Blue dye injected into the external orifice Lower fistula- lay open Fistula above puborectalis- banding
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ANATOMY
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RECTAL PROLAPSE
It is a hernia of the rectum through the pelvic floor- the mucosa and the muscle wall intussuscept through the anal canal
Early stage- prolaps occurs only with defecation and retracts spontaneously
Later stage- the rectum may prolapse when the patient stands up.
The patient reduces the prolapse manually
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Rectal prolapse
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Rectal prolapse
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RECTAL PROLAPSESURGICAL TREATMENT
Wells operation- secure the rectum within the pelvis by fixing it to the sacrum
Ripstein op.- hitching the rectum up to the sacral promontory with a sling
Unfit patients- circum-anal silicone rubber ring
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Rectopexy