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Evaluation of pre- and posttreatment pulse oximetry in acute childhood asthma
R O Wright1, K A Santucci, G D Jay
1Department of Pediatrics, Brown University School of Medicine, Rhode Island Hospital Providence 02903, USA.
Insights
Pretreatment oxygen saturation (SpO2) is a poor predictor of asthma exacerbation outcomes. However, posttreatment SpO2 below 91% significantly increases the odds of admission, aiding clinical decisions.
Area of Science:
- Pediatric Emergency Medicine
- Respiratory Medicine
- Clinical Diagnostics
Background:
- Acute asthma exacerbations in children require accurate assessment for appropriate disposition.
- Oxygen saturation (SpO2) is a common vital sign, but its predictive value for asthma outcomes needs clarification.
Purpose of the Study:
- To assess the predictive utility of pre- and posttreatment SpO2 for admission or relapse in pediatric acute asthma exacerbations.
- To evaluate SpO2 as an objective tool to guide disposition decisions.
Main Methods:
- Prospective, double-blind, observational study in a pediatric emergency department.
- SpO2 measured before and after standardized treatment, with physicians blinded to SpO2 values during disposition.
- Patient relapse determined via telephone follow-up.
Main Results:
- Pretreatment SpO2 < or = 91% showed low sensitivity (0.24) and a likelihood ratio of 1.77 for predicting admission/relapse.
- Posttreatment SpO2 < or = 91% demonstrated high specificity (0.98) and a likelihood ratio of 16.43.
- A minority of patients (32%) had posttreatment SpO2 < or = 91%, but this finding strongly predicted the need for admission.
Conclusions:
- Pretreatment SpO2 is not a reliable predictor of admission in pediatric asthma exacerbations.
- Posttreatment SpO2 < or = 91% serves as a valuable adjunct for confirming the need for hospital admission.
- Objective SpO2 measurements can enhance clinical judgment in managing acute asthma.
Objective:
To evaluate the utility of pre- and posttreatment O2 saturation (SpO2) for prediction of admission or relapse after ED release in acute asthma exacerbations using a standardized treatment protocol.
Design:
A prospective, double-blind, observational study was performed at a pediatric ED. Children with acute asthma were enrolled upon ED presentation. SpO2 was measured prior to treatment and after disposition decision. Two experienced physicians determined disposition based on history and physical examination alone, while blinded to SpO2. Relapse of released patients was determined by telephone follow-up.
Results:
A pretreatment room-air SpO2 of < or = 91% had a sensitivity of 0.24, a specificity of 0.86, and a likelihood ratio of 1.77 to predict admission/relapse. A posttreatment room-air SpO2 of < or = 91% had a sensitivity of 0.34, a specificity of 0.98, and a likelihood ratio of 16.43 to predict admission/relapse.
Conclusions:
As opposed to some previous studies, this study found pretreatment SpO2 to be a relatively poor predictor of admission. A posttreatment SpO2 of < or = 91% occurred in a minority (32%) of patients, but increased the odds of admission 16-fold and may be used as an adjunct to objectively confirm the need for admission.