A 42-year-old female presents with severe anal pain during and after defecation, accompanied by bright red blood on the toilet paper. Physical examination reveals an exquisitely tender linear tear in the posterior midline of the anal verge. What is the first-line conservative management?

Answer and explanation

Correct answer: B. High-fiber diet, stool softeners, sitz baths, and topical diltiazem or GTN

  1. Step 1: Diagnose chronic anal fissure, a linear ulcer in the anoderm located in the posterior midline (90%) caused by trauma from hard stool and local sphincter hypertonicity.
  2. Step 2: First-line management is conservative medical therapy: high-fiber diet, hydration, stool softeners, warm sitz baths, and topical calcium channel blockers (diltiazem) or topical nitrates (GTN) to reduce internal anal sphincter resting pressure.
  3. Step 3: Surgery (lateral internal sphincterotomy) is reserved for medically refractory fissures.
Answer
High-fiber diet, stool softeners, sitz baths, and topical diltiazem or GTN.
Why not the others: 'Immediate lateral internal sphincterotomy under general anesthesia' carries a risk of fecal incontinence and is reserved for medically refractory cases; 'Rubber band ligation of the anal verge' is used for internal hemorrhoids and would cause extreme agony if applied below the dentate line; 'Oral ciprofloxacin and metronidazole for 14 days' is ineffective because anal fissures are mechanical tears, not bacterial infections.

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A 42-year-old female… | Oman Medical Specialty Board Examination (OMSB)