AIMS

To understand which clinical criteria physicians use to diagnose pneumonia compared to bronchitis and upper respiratory tract infection (URTI).

METHODS

Retrospective chart review of adults diagnosed with pneumonia, bronchitis, or URTI.

RESULTS

Logistic regression analysis identified rales, a temperature > 100 degrees F (37.8 degrees C), chest pain, dyspnoea, rhonchi, heart rate, respiratory rate, and rhinorrhoea, as the best explanation for the variation in diagnosis of pneumonia compared to either of the alternative diagnoses (R2 = 59.3), with rales and a temperature > 100 degrees F explaining 30% of the variation. Rales, chest pain, and a temperature > 100 degrees F best predicted the ordering of a chest x-ray (R2 = 20.0). However, 35% (59/175) of patients diagnosed with pneumonia had a negative chest x-ray. Abnormal breath sounds were the best predictors for prescribing antibiotics (R2 = 38%). A significant number of patients with acute bronchitis (93% excluding sinusitis) and URTI (42%) were given antibiotics.

CONCLUSIONS

The presence of abnormal breath sounds and a temperature > 100 degrees F were the best predictors of a diagnosis of pneumonia.