Abstract
Bronchial hyperresponsiveness (BHR) is a representative feature of asthma. Although methacholine and mannitol are commonly used for bronchial challenge tests, the optimal roles of the two agents for assessing BHR remain unclear. We compared the diagnostic performance of methacholine and mannitol in bronchial challenge tests. A systematic literature search was performed using MEDLINE, EMBASE, and the Cochrane Central Register. The sensitivity, specificity, diagnostic odds ratio (DOR), and a hierarchical summary of the receiver-operating characteristic curve (HSROC) of the two agents for detecting BHR in asthma were pooled using meta-analysis. A meta-regression analysis was used to identify potential sources of heterogeneity within the selected studies. We identified six studies comprising 565 patients. The pooled sensitivity, specificity, and DOR of methacholine were 0.61 (95%CI, 0.44-0.76), 0.93 (95%CI, 0.70-0.99), and 23.47 (95% CI, 2.51-219.89), respectively. The pooled sensitivity, specificity, and diagnostic odds ratio of mannitol were 0.50 (95%CI, 0.28-0.73), 0.97 (95% CI, 0.94-0.99), and 35.22 (95% CI, 8.82-140.62), respectively. The area under the HSROC for mannitol was higher than that for methacholine (0.97 vs. 0.81, p...Continue Reading
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