Abstract
Physicians have few objective methods with which to assess the severity of acute asthma exacerbations in pediatric patients. Percent predicted forced expiratory volume in 1 second (%FEV1) by spirometry is the accepted criterion standard but is frequently not available in acute care settings. Prior pediatric investigations have noted modest correlation of accessory muscle use with lower %FEV1 but have not reported severity-dependent associations of accessory muscle use by muscle groups in use with %FEV1 or hospitalization decisions.
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