Unsutured loop ileostomy at the extraction site: fewer parastomal hernias

Design

Single-centre, open-label randomised controlled trial

Population

216 patients with extraction-site loop ileostomy after laparoscopic low anterior resection

Primary outcome

Parastomal hernia before ileostomy reversal

Effect

4.8% vs 13.5%; RR 0.35 (0.13 to 0.94)

The UNSEAL trial randomised patients having laparoscopic low anterior resection for rectal cancer with a protective loop ileostomy through the specimen-extraction site. One group had a sutured technique (fascial and peritoneal fixation, no rod); the other had an unsutured composite technique (no fixation, a routine supporting rod and a smaller, tailored fascial opening). Hernia was assessed clinically, by routine CT before reversal and at reversal.

Of 216 patients analysed per protocol, parastomal hernia occurred in 13.5% sutured vs 4.8% unsutured (risk ratio 0.35, 95% CI 0.13 to 0.94; risk difference −8.7%). Stoma formation was quicker (median 24 vs 31 minutes) and output came earlier, without a shorter stay. Other stoma complications, reversal outcomes and quality of life did not differ.

For surgeons who fashion ileostomies through the extraction wound, this is randomised evidence that a snug fascial opening and a rod may matter more than fixation sutures. It is a single-centre, open-label, per-protocol result with a confidence interval that runs close to 1, and the three components cannot be separated. It is reasonable to adopt the tailored aperture now and watch for confirmation.

• Tailor the fascial aperture to the bowel at the extraction site rather than leaving the full extraction incision open.
• Consider a supporting rod with the unsutured technique, as used in the trial's lower-hernia arm.
• Do not spend time on fascial/peritoneal fixation sutures expecting them to prevent hernia; they did not here.
• Audit parastomal hernia before reversal with CT where your pathway already includes it.

Why it matters

It challenges the habit of suturing the bowel to the fascia to prevent parastomal hernia.

Don't overread it

Single-centre, open-label and per-protocol, with a confidence interval near 1; the three components cannot be separated.

The statistics, in plain English

A risk ratio of 0.35 means hernia was about one-third as common with the unsutured technique. The interval (0.13 to 0.94) excludes no effect, but only just, so the true benefit could be much smaller. The absolute difference was about 9 fewer hernias per 100 patients.

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