GetTheDiagnosis.org

Welcome, guest.
Login or Sign up to edit.

Add an entry

Search:
 

Tools

Add a finding for this diagnosis

Add prevalence for this diagnosis

Switch to display mode

Switch to sensitivity and specificity

Sort findings by Tag

Sort findings by Differential Diagnosis

Jump To

Good Positive and Negative Likelihood Ratios

Good Negative Likelihood Ratio

Good Positive Likelihood Ratio

Pyloric Stenosis: Likelihood Ratios

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]

[Edit Diagnosis] [Merge dx] [Add prevalence]

Tags: Congenital Gastrointestinal Problem Tag this Diagnosis.

Prevalence

Population / CalculatorPrevalence Comments / Study / Link
Infants 0.3% Boys 5x more likely than girls.

Am J Emerg Med. 1999 Jan;17(1):28-31. PMID: 9928693

More, Edit...

The likelihood ratios of findings for Pyloric Stenosis are listed below. See the left navigation bar to change the display.

Pre-Test Probability (Prevalence): %. Post-Test Probability (Predictive Value): %. Switch to display mode.
**Note that calculating probabilities from more than one finding is inherently inaccurate because findings are not independent. (For example, using two positive findings that share a common pathogenesis is likely to overestimate the true probability.)
Good Positive and Negative Likelihood Ratios
FindingResult +LR-LR
[ + ] Upper GI Series + 0 - inf0
[ + ] Abdominal US + 0 - inf0.1
[ + ] Abdominal Mass + 0 - inf0.3
[ + ] Weight loss + 0 - 2.50.3
[ + ] Abnormal Serum Chloride + 0 - 500.5
Good Negative Likelihood Ratio
FindingResult +LR-LR
[ + ] Projectile Vomiting + 0 - 1.50.2
Good Positive Likelihood Ratio
FindingResult +LR-LR
[ + ] Abnormal Serum Bicarbonate + 0 - 360.6