Clinical predictors of pneumonia among children with wheezing.

OBJECTIVE: The goal was to identify factors associated with radiographically confirmed pneumonia among children with wheezing in the emergency department (ED) setting.

METHODS: A prospective cohort study was performed with children <or=21 years of age who were evaluated in the ED, were found to have wheezing on examination, and had chest radiography performed because of possible pneumonia. Historical features and examination findings were collected by treating physicians before knowledge of the chest radiograph results. Chest radiographs were read independently by 2 blinded radiologists.

RESULTS: A total of 526 patients met the inclusion criteria; the median age was 1.9 years (interquartile range: 0.7-4.5 years), and 36% were hospitalized. A history of wheezing was present for 247 patients (47%). Twenty-six patients (4.9% [95% confidence interval [CI]: 3.3-7.3]) had radiographic pneumonia. History of fever at home (positive likelihood ratio [LR]: 1.39 [95% CI: 1.13-1.70]), history of abdominal pain (positive LR: 2.85 [95% CI: 1.08-7.54]), triage temperature of >or=38 degrees C (positive LR: 2.03 [95% CI: 1.34-3.07]), maximal temperature in the ED of >or=38 degrees C (positive LR: 1.92 [95% CI: 1.48-2.49]), and triage oxygen saturation of <92% (positive LR: 3.06 [95% CI: 1.15-8.16]) were associated with increased risk of pneumonia. Among afebrile children (temperature of <38 degrees C) with wheezing, the rate of pneumonia was very low (2.2% [95% CI: 1.0-4.7]).

CONCLUSIONS: Radiographic pneumonia among children with wheezing is uncommon. Historical and clinical factors may be used to determine the need for chest radiography for wheezing children. The routine use of chest radiography for children with wheezing but without fever should be discouraged.