Predictive performance of thyromental height for difficult laryngoscopies in adults: a systematic review and meta-analysis.

Background: Thyromental height (TMH) was first reported as a great single test for prediction of difficult laryngoscopies, although further studies have shown variable estimates of its accuracy. We thus performed this meta-analysis to summarize the predictive values of TMH mainly for prediction of difficult laryngoscopies.

Methods: A search in PubMed, EMBASE, LILACS, and Scielo was conducted in June 2020.