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To assess the incidence of the difficult intubation and evaluate its clinical characteristics, we analyzed 964 cases of video records of tracheal intubation by Macintosh type video laryngoscope (MVL; X-Lite video^[○!R]: Rusch, Germany). The views during the laryngoscopy were recorded on a video system, and the number of intubation attempts and total attempt times were measured afterwards. The video laryngoscope grade (V-grade) was determined based on the Cormack & Lehane grade (C-grade), and its correlation with the Mallampati classes (MP), the number of intubation attempts, and total attempt time were analyzed. V-grade 3 was defined as a difficult intubation, and morphological measurement of the head and neck regions was performed postoperatively. Of the 964 patients, 522, 416, and 26 patients were classified into V-grade 1, 2 and 3, respectively, and the number and time of attempts significantly increased with the grade (p |
