Krantz M A, Poulos J G, Chaouki K, Adamek P
Department of Anesthesiology, Meridia Huron Hospital, Cleveland, OH.
J Clin Anesth. 1993 Jul-Aug;5(4):297-301. doi: 10.1016/0952-8180(93)90122-u.
To assess the efficacy of the "laryngeal lift" maneuver in improving laryngoscopic visualization to facilitate endotracheal intubation.
Blinded study.
Operating room at Meridia Huron Hospital.
305 patients receiving general anesthesia for elective surgery requiring intubation. (Five patients were eliminated from the study because we elected to intubate these patients awake and sedated.)
Following induction of anesthesia and paralysis with muscle relaxants, laryngoscopic views of each patient were evaluated by the laryngoscopist before and after the laryngeal lift was performed by an anesthesiologist assisting the laryngoscopist. Each patient served as his or her own control group. The anesthesiologist was blinded to the results obtained by the laryngoscopist. All Grade I laryngoscopic views were eliminated (198 patients). Five patients were eliminated on the basis of obesity or atlantoaxial subluxation. The laryngeal lift was performed on the remaining 102 patients, representing Grade II to Grade V laryngoscopic views.
A modification of the original classification of laryngoscopic views by Cormack and Lehane was used: Grade I = full view of glottis; Grade II = only posterior commissure visible; Grade III = arytenoids visible; Grade IV = epiglottis visible; Grade V = no glottic structure visible. In 98 of 102 cases (96%), the maneuver improved visualization by at least 1 grade. There was no evidence of change in the 4 remaining cases.
The laryngeal lift should be part of the anesthesiologists' armamentarium in helping the laryngoscopist who is faced with Grades II, III, IV, and V laryngoscopic views to enhance visualization of the larynx and thus facilitate endotracheal intubation.
