title: A comparative study between Truview(PCD) laryngoscope and Macintosh laryngoscope in viewing glottic opening and ease of intubation: A crossover study.
abstract: BACKGROUND
  Truview(PCD) 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 Truview(PCD) laryngoscope and Macintosh laryngoscope in patients undergoing general anesthesia (GA).
  
  
  METHODS
  Two hundred patients undergoing elective surgery, under GA were randomized into two groups, Group TV and Group ML. In Group TV, Trueview(PCD) 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 Truview(PCD) laryngoscope. Time to intubation, CLG, number of attempts and hemodynamic parameters were recorded.
  
  
  RESULTS
  Ninety-six and 89 patients had CLG1 visualization when Truview(PCD) laryngoscope was used as 1(st) and 2(nd) 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 Truview(PCD) laryngoscope (P = 0.00). Mean time taken for intubation with Truview(PCD) and Macintosh laryngoscope was 21.10 ± 5.64 s and 15.79 ± 2.76 s respectively (P = 0.00).
  
  
  CONCLUSIONS
  Better visualization with lesser CLG was found with Truview(PCD) laryngoscope but it took longer time for intubation than Macintosh laryngoscope. The hemodynamic response to intubation was significantly less with the use of Truview(PCD) laryngoscope when compared to that of Macintosh laryngoscope.
authors.affiliation: Department of Anaesthesiology and Critical Care, Mahatma Gandhi Medical College and Research Institute, Pillaiyarkuppam, Puducherry, India.
authors.forename: Sourav Kr
authors.initials: SK
authors.lastname: Bag
authors.affiliation: Department of Anaesthesiology and Critical Care, Mahatma Gandhi Medical College and Research Institute, Pillaiyarkuppam, Puducherry, India.
authors.forename: V R Hemanth
authors.initials: VR
authors.lastname: Kumar
authors.affiliation: Department of Anaesthesiology and Critical Care, Mahatma Gandhi Medical College and Research Institute, Pillaiyarkuppam, Puducherry, India.
authors.forename: N
authors.initials: N
authors.lastname: Krishnaveni
authors.affiliation: Department of Anaesthesiology and Critical Care, Mahatma Gandhi Medical College and Research Institute, Pillaiyarkuppam, Puducherry, India.
authors.forename: M
authors.initials: M
authors.lastname: Ravishankar
authors.affiliation: Department of Anaesthesiology and Critical Care, Mahatma Gandhi Medical College and Research Institute, Pillaiyarkuppam, Puducherry, India.
authors.forename: J
authors.initials: J
authors.lastname: Velraj
authors.affiliation: Department of Anaesthesiology and Critical Care, Mahatma Gandhi Medical College and Research Institute, Pillaiyarkuppam, Puducherry, India.
authors.forename: M
authors.initials: M
authors.lastname: Aruloli
keywords: Ease of intubation; TruviewPCD laryngoscope; glottic view