Postoperative organ space infection (OSI) following appendectomy: early term evaluation for pediatric population.

No consensus has been reached on the duration of antibiotic prophylaxis for postoperative organ space infection (OSI) following appendectomy. This study investigated the influence of antibiotic administration on postoperative OSIs in children with complex appendicitis. A multicenter, retrospective study was conducted in patients with OSI following complicated appendicitis between 2017 and 2019 at 3 hospitals in China. The qualified patients were dichotomized into a long-duration antibiotic group (> 5.5 days) and a short-duration antibiotic group (< 5.5 days) based on the median duration (5.5 days) of antibiotic administration. Potential biases in baseline characteristics were managed using propensity score matching for the two groups. Primary and secondary outcomes were compared between the two groups. Propensity-matched analysis of the entire cohort revealed no significant effects in terms of the time to OSI resolution (p = 0.16) or recurrence (p = 0.22) for the short-duration and long-duration antibiotic groups. A slightly lower complication rate, including the incidence of abdominal distention (p = 0.093) and antibiotic-associated diarrhea (p = 0.024), was noted in patients with short-duration antibiotic administration. Furthermore, no significant difference in readmission requirements (p = 0.14) or hospitalization duration (p = 0.102) was found between the two groups. For OSI following complicated appendicitis, long-term antibiotic administration did not provide a significant benefit.