The usefulness of pulse oximetry in evaluating acutely ill asthmatics.

To examine the usefulness of pulse oximetry in determining the severity of acute asthma, the arterial oxygen saturation (SaO2) of 196 acutely ill asthmatic children was measured while the children were being treated in the emergency department (ED). The measure of severity used was the disposition from the ED--discharge or hospitalization--after receiving standard ED care. The mean pretreatment SaO2 of the 172 children discharged was 96.