Young children with perforated appendicitis benefit from prompt appendectomy.

Background/purpose: To identify factors associated with nonoperative treatment failure in pediatric perforated appendicitis compared to immediate appendectomy.

Methods: After IRB approval, between September 2016 and August 2017, prospective data were recorded for children (age: 1-18 years) with completed appendectomies and pathologist-confirmed perforations. Children were treated according to clinician-designated preference. Nonoperative treatment was considered failed if a nonresolving obstruction developed or any return of symptoms before the planned interval. The median time from pain onset to treatment initiation was 3 days (range: 1-14). Presentation on days 1 or 2 (early) was compared to day 3 or after(late). The nonoperatives were compared to appendectomies stratified by presentation time. Variables were compared by chi-square, Fisher exact or t-tests. Logistic regression evaluated for independence.

Results: Of 201 suspected perforations, 176 were included, 101 (57%) immediate appendectomies and 75 (43%) nonoperatives. Of 75, 24 (32%) failed; 6 (25%) in hospital, 18 (75%) after discharge. In 51 (68%), nonoperative treatment succeeded. Significantly younger children failed nonoperative treatment (p = 0.03). Failure was independently associated with treatment initiation within 2.75 days from pain onset (OR: 0.07, 95% CI: 0.57-0.98) (p = 0.010) and lower WBC at presentation (OR: 0.03, 95% CI: 0.81-0.98) (p = 0.014). When compared to immediate appendectomy, nonoperatives had more morbidity.

Conclusion: Younger children fail nonoperative treatment, perforate rapidly and have a significantly lower WBC, but benefit from immediate appendectomy.

Level Of Evidence: Treatment Study Level II.