Appropriate Size of Laryngeal Mask Airway in Thai Children: Is It Age or Weight that Better Correlated

Area of Science:

• Anesthesiology
• Pediatric Airway Management

Background:

• Laryngeal mask airway (LMA) size selection in pediatric patients remains a clinical challenge.
• Current guidelines lack consensus on whether patient age or body weight is the most appropriate predictor for LMA sizing.

Purpose of the Study:

• To evaluate the reliability of body weight and age as predictors for laryngeal mask airway (LMA) size selection in Thai pediatric patients.
• To establish evidence-based weight and/or age ranges for appropriate LMA size selection.

Main Methods:

• A retrospective review of 741 pediatric patients (aged 0-8 years) was conducted.
• Data were collected from October 1, 2012, to December 31, 2013.
• Correlation between patient age, body weight, and LMA size was analyzed, with successful insertion defining appropriate sizing.

Main Results:

• Specific weight ranges were identified for LMA size selection: Size 1 for <7 kg, Size 1.5 for 7-11 kg, Size 2 for 11-17 kg, and Size 2.5 for 15-28 kg.
• A poor correlation was observed between children's age and the appropriate LMA size.
• Body weight demonstrated a strong correlation with LMA size selection.

Conclusions:

• Laryngeal mask airway (LMA) size selection in Thai pediatric patients should primarily be based on patient body weight.
• The study provides specific, applicable weight-based guidelines for LMA sizing in this population.
• Weight-based sizing enhances the predictability and success rate of LMA insertion in children.