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Abstract
According to the latest difficult airway guidelines by the American Society of Anesthesiologists Task Force on Management of the Difficult Airway,[2] Cormack-Lehane grades 3-4 should be defined as difficult laryngoscopy. [...]it was unclear whether the external laryngeal manipulations (not limited to external laryngeal pressure) were allowed to improve the laryngeal visualization with Macintosh laryngoscope or that the exact sizes of Macintosh blade were used. [...]we could not determine whether an optimal laryngoscopy attempt was performed when defining a difficult laryngoscopy. [...]regarding sample size calculation, the authors stated that as to the success rates in a previous study, a sample size of 135 patients was needed to have at least 90% power to detect a difference between the two groups. [...]postoperative sore throat was used as a secondary endpoint for performance comparison of studied devices. [...]only the adjuncts used for intubations with two devices are valid variables for performance comparison.