title: Evaluating pediatric intussusception using 24-hour ultrasound.
abstract: BACKGROUND
  Although ultrasound is often the preferred pediatric imaging modality for the evaluation of intussusception in children, many institutions lack access to ultrasound at night. This study characterized the day- and nighttime use of radiographic imaging for evaluation of intussusception.
  
  
  METHODS
  The charts of pediatric patients evaluated for intussusception between January 2010 and December 2010 were reviewed retrospectively to evaluate the day- and nighttime use of radiographic imaging. Patients were stratified into day and night groups according to when the imaging studies were performed, and differences in the clinical characteristics, imaging studies, cost, and final diagnosis were compared.
  
  
  RESULTS
  Pediatric consultations were performed for 86 suspected intussusceptions: 40 (46.5%) during the day [38 (95%) ultrasounds and 33 (82.5%) plain abdominal X-rays] and 46 at night [3 (6.5%) computed tomography and 39 (84.7%) plain abdominal X-rays]. The rate of positive enemas was significantly higher during the day than at night (97.5% vs. 52.2%, p < 0.001). The radiation dose during the initial survey was significantly lower during the day than at night (0.63 ± 0.48 vs. 2.06 ± 1.48 mSv, p < 0.001).
  
  
  CONCLUSIONS
  Radiographic imaging at night results in higher radiation exposure and negative enema findings. Twenty-four-hour ultrasound availability would decrease the radiation exposure and unnecessary enemas for intussusceptions suspected clinically.
authors.affiliation: Department of Pediatrics, Chang Gung Memorial Hospital, Chang Gung University, College of Medicine, Tauyuan, Taiwan.
authors.forename: Yi-Jung
authors.initials: YJ
authors.lastname: Chang
authors.forename: Hsun-Chin
authors.initials: HC
authors.lastname: Chao
authors.forename: Chao-Jan
authors.initials: CJ
authors.lastname: Wang
authors.forename: Wan-Chak
authors.initials: WC
authors.lastname: Lo
authors.forename: Dah-Chin
authors.initials: DC
authors.lastname: Yan
mesh_terms: D000293:Adolescent; D001466:Barium Sulfate; D002648:Child; D002675:Child, Preschool; D002940:Circadian Rhythm; D015331:Cohort Studies; D004733:Enema / Q000379:methods; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007443:Intussusception / Q000000981:diagnostic imaging* / Q000628:therapy; D008297:Male; D011829:Radiation Dosage; D011860:Radiography, Abdominal / Q000379:methods; D015203:Reproducibility of Results; D012189:Retrospective Studies; D018570:Risk Assessment; D013997:Time Factors; D014057:Tomography, X-Ray Computed / Q000379:methods*; D018608:Ultrasonography, Doppler / Q000379:methods*
chemical_list: D001466:Barium Sulfate
keywords: enema; intussusception; ultrasound