When an anal fissure does not respond adequately to initial conservative management — specifically when soft, strain-free stool passage is not achieved — a structured next-step approach is indicated. This protocol outlines the recommended course of action at that point.
The first line of management consists of basic conservative treatment: measures to encourage soft stools through lifestyle and dietary changes (including adequate fibre intake) and laxatives; analgesia with topical anaesthetic agents and nonopioid analgesics; sitz baths; and toilet habit advice.
Pharmacological topical therapy becomes the recommended approach at this stage. The choice between available topical agents may be guided by the patient's individual clinical history — in particular, certain agents may be preferred or avoided depending on that history.
The full protocol specifies the options, duration, and selection criteria.
Healing of the anal fissure, assessed after an adequate treatment course of 6–8 weeks. A healing rate of 50%–60% may be expected with an appropriate regimen completed over this period.
For the first-line treatment of chronic anal fissures topical treatment with either glyceryl trinitrate (GTN) 0.4% or diltiazem 2% for 2 months may be considered.
The minimum time needed to heal a fissure appears to be greater than 4 weeks and most clinicians recommend an 8 week course.
A 50%–60% healing rate may be expected after an adequate course of treatment of perhaps 6–8 weeks (Recommendation 5).
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