End-tidal carbon dioxide, a point-of-care biomarker to assess severity in acute asthma: A systematic review.

Background And Objective: Accurate severity assessment in acute asthma is vital to guide patient management and disposition. End-tidal carbon dioxide (EtCO) has been proposed as a real-time measure for this purpose. This study aimed to systematically review literature on EtCO measurement in assessing the severity of acute asthma exacerbations.