Objective: Transnasal flexible laryngoscopy (TFL) is a simple, safe, and cost-effective procedure. TFL is routinely performed to awake patients in a sitting position but there is no a definite data about ideal head and neck position to be applied. The aim of this study is to determine which position is most appropriate to obtain the best laryngeal view during the TFL.
Methods: The TFL videos of 132 randomized patients were evaluated by three blind observers experienced with laryngology. Three basic head positions; simple head extension (SHE), sniffing position (SP), and neutral position (NP) were performed during the TFL-Interobserver agreements for the grading system scores were assessed by using the kappa (k) statistic.
Results: For the SHE and SP, the numbers of patients constituting grade 1 were 127 (96.2%) and 126 (95.5%), respectively, while grade 2a were 5 (3.8%) and 6 (4.5%), respectively. In NP, the number of patients constituting grade 1 was 5 (3.8%), while grade 2a was 83 (62.9%), grade 2b was 37 (28%), and grade 3 was 7 (5.3%). The k score of the SHE was 0.826 (P < 0.001) between the ratings of observer 1 and observer 2, 0.905 (P < 0.001) between observer 1 and observer 3, and 0.919 (P < 0.001) between observer 2 and observer 3. These values denote nearly perfect agreement. A complete agreement was seen in 130 of the 132 (98.48%) videos.
Conclusion: SHE and SP both provide a better glottic view than the NP and demonstrate the same success.
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