Comparison of the trapezius squeezing test and jaw thrust as indicators for laryngeal mask airway insertion in adults

Korean Journal of Anesthesiology, 10/20/2011

Chang CH et al. – The trapezius squeezing test is a superior indicator of an adequate condition for laryngeal mask airway (LMA) insertion compared to the jaw thrust maneuver in adults under sevoflurane anesthesia.


  • One hundred adult patients of ASA physical status 1 or 2 undergoing minor surgical procedures were randomly allocated to the T (trapezius squeezing, n=50) group or the J (jaw thrust, n=50) group.
  • The LMA was inserted immediately after the loss of response to trapezius squeezing or jaw thrust.
  • Successful and unsuccessful attempts were recorded.
  • An unsuccessful attempt was defined as the occurrence of coughing, gagging, gross purposeful movements, breath-holding, laryngospasm, or an SpO2<90% during LMA insertion.
  • Insertion time, end-tidal sevoflurane concentration, mean arterial pressure, and heart rate were recorded.


  • The incidence of successful attempts was significantly higher in the T than in the J group (48/50 vs. 36/50, respectively).

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