The Effect of Different Positions on Determining the Modified Mallampati Class in Order to Predict the Difficulty of Ventilation with Mask, and the Laryngoscopy Grade and Difficult Intubation in Candidates for Surgery

Abstract

Background: Inadequate ventilation with mask and difficult intubation are the most common adverse respiratory outcomes in patient undergoing anesthesia .The aim of this study was to compare Mallampati test in different sitting positions in traditional approach and during phonation for predicting difficult laryngoscopy and intubation in candidates for surgery. Methods: In this diagnostic value study on 385 patients, in different positions of supine and sitting with and without abeslang, Mallampati test was examined by a blind person regarding the condition of the mallmpati, laryngoscopy grade, and the severity of intubation. The results of these four positions of mallampati were compared in predicting laryngoscopy grade and the severity of intubation. Findings: All mallampati test scenarios had acceptable diagnostic value (P 0.050). Mallampati test accuracy in supine position with open mouth was less than other positions. However, with a low accuracy, this position had the highest sensitivity (100%). Positive predictive values of supine and sitting positions with abeslang were higher than other positions. Conclusion: According to the results of this study, the Malamapati test in the position of supine with abeslang was better in determining the severity of laryngoscopy and intubation.

Keywords

• laryngoscopy
• ventilation
• intubation, endotracheal