Pyloric Stenosis: Sensitivity and Specificity
Introduction: Congenital hypertrophy of the pyloris, i.e. the gastric outlet. Onset on average 3-5 weeks of life. Corrected surgically.
Note that the diagnostic accuracies have changed over time:
" Over the 25-year period, 901 infants underwent PM. Patients presented at a younger age, weighed more, and had a shorter length of illness in the most recent time period. Hypochloremic alkalosis was found half as frequently in the most recent time period compared to the earliest group. A palpable pyloric tumor was present in 79% of patients in the earliest time period compared with 23% in the most recent time period. Sixty-one percent of patients in the earliest group and 96% in the latest group underwent an imaging study, reflecting the referring physician's evaluation before referral to the surgeon." [PMID 9233980]
|Population / Calculator||Prevalence||Comments / Study / Link|
|Infants||0.3%||Boys 5x more likely than girls.
Am J Emerg Med. 1999 Jan;17(1):28-31. PMID: 9928693