The American Society for Gastrointestinal Endoscopy has published a clinical practice guideline on the role of endoscopy in acute lower gastrointestinal bleeding, developed throughout with the GRADE framework.
It addresses the questions that actually get argued about at three in the morning. Should the first investigation be colonoscopy or CT with or without angiography. Should colonoscopy be urgent or non-urgent. Should it be done prepped or unprepped. For diverticular bleeding specifically, it compares endoscopic band ligation with clipping, and direct clipping of the bleeding site or vessel with indirect clip closure of the diverticulum. It also covers the role of upper endoscopy in apparent lower bleeding, the role of surgery, and the absolute and relative contraindications to colonoscopy, with a summary of recommendations in its first table.
Two of those questions deserve flagging because practice varies most widely on them. The urgent-versus-non-urgent colonoscopy debate has run for years with trials pointing towards no mortality benefit from rushing, and the prepped-versus-unprepped question determines whether a patient waits for preparation or goes straight to a poor-quality examination. Whichever way the recommendations fall, having them GRADE-rated means you can see how much evidence sits behind each one rather than inheriting local habit.
The practical step is to read the summary table against your own unit's pathway, particularly on first-line imaging. In many Indian hospitals CT angiography is more readily available out of hours than an emergency colonoscopy list, and a guideline that treats the imaging-first approach as a legitimate option rather than a compromise is worth having in writing when arguing for a pathway.
- New ASGE guideline covers first-line modality, timing, and bowel preparation in acute lower GI bleeding.
- It also addresses band ligation versus clipping, and direct versus indirect clipping, for diverticular bleeding.
- Read the summary table in Table 1 against your unit's current out-of-hours pathway.
- GRADE ratings let you see which recommendations rest on solid evidence and which on judgement.
- The contraindications section is worth reading before the next request for an unprepped emergency colonoscopy.
The statistics, in plain English
GRADE distinguishes the certainty of evidence from the strength of a recommendation, and in acute lower gastrointestinal bleeding that distinction does a lot of work: most of the randomised evidence is small, and questions like optimal timing have been addressed by a handful of trials with modest event rates. Expect a mixture of conditional recommendations based on low or moderate certainty. A conditional recommendation is an invitation to consider local factors — here, out-of-hours endoscopy availability and radiology access — rather than a standard to audit against.
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