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Establishing clinically relevant standards for tachypnea in febrile children younger than 2 years
J A Taylor1, M Del Beccaro, S Done
1Department of Pediatrics, University of Washington, Seattle.
Insights
Tachypnea (rapid breathing) is a key indicator of pneumonia in febrile children under two. Specific respiratory rates help identify pneumonia risk, and its absence can rule out the need for chest X-rays.
Area of Science:
- Pediatrics
- Respiratory Medicine
- Diagnostic Accuracy
Background:
- Febrile infants and young children often present with respiratory distress.
- Identifying pneumonia early is crucial for timely treatment and preventing complications.
Purpose of the Study:
- To establish precise respiratory rate cutoffs for defining tachypnea in febrile children younger than 2 years.
- To determine the diagnostic value of tachypnea for identifying pneumonia risk in this age group.
Main Methods:
- A prospective case series design was employed.
- Respiratory rates were measured in 572 febrile children under 2 years old.
- Receiver operating characteristic (ROC) curves were used to optimize tachypnea definitions for pneumonia detection.
Main Results:
- Pneumonia was diagnosed in 7% of the study population.
- Optimal tachypnea cutoffs were identified: 59/min (infants <6 months), 52/min (6-11 months), and 42/min (1-2 years).
- These definitions yielded a sensitivity of 73.8% and specificity of 76.8% for pneumonia, with a high negative predictive value of 97.4%.
Conclusions:
- Tachypnea, using the study-defined cutoffs, is a significant predictor of pneumonia in febrile children under 2 years.
- The absence of tachypnea suggests pneumonia is unlikely, potentially reducing the need for chest radiography.
Objective:
To determine values for defining tachypnea in febrile children younger than 2 years that best identify those at risk for pneumonia.
Design:
Prospective case series.
Study Patients:
Children younger than 2 years presenting to the emergency department of a children's hospital with a temperature of 38 degrees C or higher.
Interventions:
Using a standardized method, respiratory rates were obtained on eligible children for 1 year. Study patients were classified as having pneumonia or no pneumonia based on clinical evaluation and chest radiograph findings. Receiver operating characteristic curves were constructed to select the values for respiratory rate that maximized sensitivity and specificity of tachypnea as a sign of pneumonia.
Results:
Data were analyzed for 572 children; pneumonia was present in 42 (7%). The diagnostic utility of tachypnea was maximal when cutoff values for respiratory rates of 59/min in infants younger than 6 months, 52/min in those aged 6 through 11 months, and 42/min in those aged 1 to 2 years were selected. Based on these definitions, tachypnea as a sign of pneumonia had a sensitivity of 73.8%, specificity of 76.8%, positive predictive value of 20.1%, and negative predictive value of 97.4%.
Conclusions:
Tachypnea, as defined in this study, is an important predictive sign of pneumonia in febrile children younger than 2 years. Conversely, the absence of tachypnea obviates the need for chest radiography in most settings.