• Mary Jane Piroutek, Lance Brown, and Andrea W Thorp.
• Department of Emergency Medicine, Loma Linda University Medical Center, 11234 Anderson Street, Loma Linda, CA 92354, USA.
• Clin Pediatr (Phila). 2012 Mar 1; 51 (3): 214-8.

ObjectiveTo describe the incidence of bilious vomiting in infants with infantile hypertrophic pyloric stenosis that presented to a pediatric emergency department.MethodsA retrospective medical record review included all infants who presented to our level 1 pediatric emergency department from January 1, 2005, through December 31, 2009, who were diagnosed intraoperatively with infantile hypertrophic pyloric stenosis. Emesis was determined to be bilious if the vomit was described as "green," "containing bile," or "bilious."ResultsThe authors identified 354 infants with infantile hypertrophic pyloric stenosis. The median age was 4 weeks 6 days (range = 11 days to 13 weeks). Bilious emesis was encountered in 1.4% (5/354; 95% confidence interval = 0.5% to 3.2%). The pyloric thickness measurements on ultrasound were significantly smaller in those with bilious emesis compared with those without bilious emesis (z score = 2.64; P = .014).ConclusionBilious emesis was the presenting symptom in a small proportion of infants with infantile hypertrophic pyloric stenosis.

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