Age as an Exclusion Criterion for Nonoperative Management in Simple Acute Appendicitis in Children.

Objective:  Nonoperative management (NOM) for simple acute appendicitis (SAA) is an acceptable mode of treatment in healthy children. Previous studies of NOM routinely excluded young children (< 5 years); however, the effect of age on NOM failure has not been directly assessed. Efficiency of NOM in young adults is questionable. Therefore, adolescents may also be at greater risk of NOM failure. Our aim was to investigate the effect of age on NOM failure.

Methods:  This is a retrospective analysis of children with SAA who received NOM between January 1, 2019, and June 30, 2021, at our institution. NOM failure was defined by subsequent appendectomy. Age was assessed as a continuous variable, and we also compared different age subgroups.

Results:  In this study, 151 children were included (60% male), mean age 11.2 ± 3.2 years (range: 5-17). Overall, 66 children (44%) failed NOM, 90% of them within the first year (median 7 weeks). Ten percent of the cohort were younger than 6 years of age and 33% of them failed NOM (p = 0.39). Per 1 year increase in age, the odds of NOM failure increased by 12% (p = 0.027). Children over 14 years of age had 2.46 times higher odds to fail NOM (p = 0.03). These higher odds remained after adjusting for appendiceal diameter and appendicolith. Linear regression showed a decrease by a factor of 12 at the time of NOM failure with every 1-year increase in age (β = -12, p = 0.09).

Conclusion:  The risk of NOM failure in children increases with age; therefore, age should be considered when deciding on the optimal management of SAA, especially in adolescents. Effectiveness of NOM in children younger than 6 years is noninferior to older children and therefore should not be excluded.