Determining predictive value of preoperative tests for difficult intubation

In the recent article by Mahmoodpoor et al. [1] evaluating the predictive value of several preoperative tests for difficult intubation in a prospective descriptive study, they conclude that facial angle has a high sensitivity, positive and negative predictive value, and Youden index for prediction of difficult intubation, but the best result is achieved when facial angle is used in combination with either the modified Mallampati score or upper lip bit test. As difficult intubation prediction by preoperative tests is a crucial component of safe airway management algorithm [2], their findings have potential implications.

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