Association of Time Since Diagnosis of Pediatric Ileocolic Intussusception With Success of Attempted Reduction: Analysis in 1065 Patients.

BACKGROUND: Radiologists generally treat pediatric ileocolic intussusceptions emergently given potential worse outcomes from delayed reduction attempts. However, relevant literature is conflicting. OBJECTIVE: To identify factors associated with successful image-guided ileocolic intussusception reduction in children, with attention to the time interval since diagnosis. METHODS: This retrospective study included patients <6 years old who underwent attempted image-guided enema reduction of ileocolic intussusception between May 2009 and July 2023. Patients were separated into two groups: those presenting directly to the institution (nontransferred patients, who all underwent attempted reduction <8 hours after ultrasound diagnosis), and those transferred from outside facilities. EHR data were extracted. Each patient's first image-guided reduction attempt was classified as successful or unsuccessful. Univariable and multivariable analyses were performed. RESULTS: The study included 1065 patients (649 male, 416 female; mean age, 18.1 months; age range, 2.2-71.0 months; 793 nontransferred and 272 transferred patients). In nontransferred patients, the mean interval between ultrasound diagnosis and reduction attempt was 150.8 minutes; in transferred patients, the mean interval between outside facility advanced imaging and reduction attempt was 460.1 minutes (p<.001). Successful reduction occurred in 84.6% and 81.6% of nontransferred and transferred patients, respectively (p=.25). In nontransferred patients, success occurred in 85.6% of attempts <2 hours after diagnosis versus 84.0% of attempts 2-<8 hours after diagnosis (p=.54); the mean interval from diagnosis to attempted reduction was 149.7 minutes and 156.8 minutes for successful and unsuccessful attempts, respectively (p=.53). In multivariable analysis, factors showing independent associations with success were proximal intussusception location (OR=3.63, p<.001) and absence of high-risk ultrasound findings (OR=2.57, p<.001); success was not independently associated with age, sex, bloody stools, reduction method, or time since diagnosis <2 hours (p>.05). In transferred patients, the mean interval from outside advanced imaging to attempted reduction was 463.1 minutes and 440.2 minutes for successful and unsuccessful attempts, respectively (p=.74). CONCLUSION: Intussusception reduction may not require completion emergently (within 2 hours after diagnosis), but potentially may be safely performed on an urgent basis (within 8 hours). CLINICAL IMPACT: The findings have implications for determining the standard of care, including criteria for oncall activation of radiologic resources, in pediatric intussusception management.