A randomised controlled trial comparing two insertion techniques for the Laryngeal Mask Airway Flexible in patients undergoing dental surgery

Anaesthesia, 06/12/2012

The study suggests the use of the laryngoscope to guide insertion of the Laryngeal Mask Airway Flexible (LMA Flexible) for dental surgery is a better option compared with the standard technique of digital manipulation.


  • One hundred and eight patients were randomly assigned into two groups based on the LMA Flexible insertion technique–either laryngoscopy–guided (n=54) or digital manipulation (standard technique; n=54).
  • Patient and airway characteristics were recorded before induction of anaesthesia.
  • The primary outcome was success rate at first insertion.
  • Other outcomes assessed included fibreoptic assessment of laryngeal mask airway placement, haemodynamic changes, need for airway adjustment during surgery and sore throat.


  • The success rate of insertion on the first attempt was higher for the laryngoscopy–assisted technique compared with the standard technique (96.3% vs 81.5%, respectively, p<0.05).
  • Fibreoptic assessment showed that the former group had better placement of the laryngeal mask airway than the latter (59.3% vs 37% p<0.05).
  • There were no significant differences between the two groups for haemodynamic changes.
  • Sore throat was more common in the group with the standard technique (35.2% vs 16.7%, p<0.05).

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