The best view at laryngoscopy using the McCoy laryngoscope with and without cricoid pressure.

The best view obtained by levering the tip of the McCoy laryngoscope blade with or without modified cricoid pressure was studied in 100 patients presenting for general surgery. The airway was assessed pre-operatively (Mallampati score, thyromental distance, mouth opening, protrusion of the jaw and weight) in an attempt to identify the patients who might benefit from the use of the McCoy laryngoscope. The vocal cords were visible at laryngoscopy with the blade in the neutral position in 32 cases. In the 68 remaining patients the vocal cords were partly visible in 48. The epiglottis only was seen in 18 patients and in two not even the epiglottis could be visualised. Elevation of the blade or modified cricoid pressure improved the view in 38/68 cases and 57/68 cases, respectively (p < 0.001, Wilcoxon signed rank). Using our method of pre-operative assessment we were unable to identify those patients who might benefit from either manipulation.