A comparative study between Truview PCD laryngoscope and Macintosh laryngoscope in viewing glottic opening and ease of intubation: A crossover study

Abstract

Background:TruviewPCD laryngoscope is specially designed to aid positioning of the endotracheal tube as well as to record entry of the tube into glottis. Aim of the study is to compare the view of glottic opening and ease of intubation between TruviewPCD laryngoscope and Macintosh laryngoscope in patients undergoing general anesthesia (GA).Methodology:Two hundred patients undergoing elective surgery, under GA were randomized into two groups, Group TV and Group ML. In Group TV, TrueviewPCD laryngoscope was used initially to visualize the vocal cords for Cormack and Lehane grading (CLG) and to spray the vocal cords with 10% lignocaine. Then the patient was ventilated for 1 min and Macintosh laryngoscope was used to visualize the vocal cords for CLG and proceed with intubation. In Group ML, Macintosh laryngoscope was used initially and later TruviewPCD laryngoscope. Time to intubation, CLG, number of attempts and hemodynamic parameters were recorded.Results:Ninety-six and 89 patients had CLG1 visualization when TruviewPCD laryngoscope was used as 1st and 2nd device respectively compared to 41 and 68 with Macintosh laryngoscope (P = 0.00). Four patients had CLG 4 visualization with Macintosh laryngoscope that turned out to be grade II visualization with TruviewPCD laryngoscope (P = 0.00). Mean time taken for intubation with TruviewPCD and Macintosh laryngoscope was 21.10 ± 5.64 s and 15.79 ± 2.76 s respectively (P = 0.00).Conclusion:Better visualization with lesser CLG was found with TruviewPCD laryngoscope but it took longer time for intubation than Macintosh laryngoscope. The hemodynamic response to intubation was significantly less with the use of TruviewPCD laryngoscope when compared to that of Macintosh laryngoscope.