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Updated: Jul 6, 2026

Laryngeal Mask Airway (LMA) Placement in a Neonatal Patient Simulator Using a Non-Inflatable Supraglottic Airway (SGA)
04:56

Laryngeal Mask Airway (LMA) Placement in a Neonatal Patient Simulator Using a Non-Inflatable Supraglottic Airway (SGA)

Published on: July 14, 2023

Optimal conditions for Laryngeal Mask Airway insertion in children can be determined by the trapezius squeezing test

Chul Ho Chang1, Yon Hee Shim, Yang-Sik Shin

  • 1Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, CPO Box 8044, Seoul 120-752, Republic of Korea.

Journal of Clinical Anesthesia
|April 16, 2008
PubMed

Insights

The trapezius squeezing test reliably indicates adequate anesthetic depth for pediatric Laryngeal Mask Airway (LMA) insertion. This method avoids neuromuscular blocking agents, ensuring patient safety during anesthesia.

Area of Science:

  • Anesthesiology
  • Pediatric Anesthesia
  • Airway Management

Background:

  • Assessing anesthetic depth is crucial for safe Laryngeal Mask Airway (LMA) insertion in children.
  • Neuromuscular blocking agents are often used but can have side effects.
  • Non-pharmacological indicators are needed to guide LMA placement.

Purpose of the Study:

  • To evaluate the efficacy of the trapezius squeezing test.
  • To determine if it's a reliable criterion for adequate anesthetic depth.
  • To assess its utility for LMA insertion in children without neuromuscular blockers.

Main Methods:

  • Prospective, randomized clinical trial involving 45 children (1-6 years).
  • LMA insertion was performed after a negative trapezius squeezing test.
  • Key outcomes included successful LMA insertion, time to insertion, end-tidal sevoflurane concentration, and hemodynamic stability.

Main Results:

  • LMA insertion was successful in 41 patients (91%).
  • Average insertion time was 5.7 ± 1.9 minutes with an end-tidal sevoflurane concentration of 3.6 ± 1.1 vol%.
  • No significant hemodynamic changes were observed.

Conclusions:

  • The trapezius squeezing test is a dependable clinical indicator.
  • It reliably assesses anesthetic depth for LMA insertion in pediatric patients.
  • This test offers a safe alternative to neuromuscular blocking agents.
Abstract

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