Appropriate Laryngeal Mask Airway Size in Patients With Overweight: A Comparison of the Actual Body Weight and Ideal Body Weight

Yonsei University

Status: Completed

Conditions: General Anesthesia

Treatments: Device: ideal body weight based size; Device: actual body weight based size

Study type: Interventional

Funder types: Other

Identifiers

NCT01843270

1-2013-0004

Details and patient eligibility

About

The classic laryngeal mask airway is one of the keystones of modern anaesthetic practice. It achieves a reliable airway with a low incidence of major complications and pharynges-laryngeal morbidity. The manufactures of laryngeal mask airway recommend the proper size selection by actual body weight. It was recommended a size 3 for 30-70kg, a size 4 for 70-90 kg, and size 5 for > 90 kg. Obesity increases the fat tissue around an upper airway and decreases the pharyngeal cross sectional area. Also it was reported that pharyngeal area was reduced according to the increasing of BMI. Therefore, the aim of this study is to determine which of actual body weight or ideal body weight is proper on the size selection of laryngeal mask airway.

Enrollment: 100 patients

Sex: All

Ages: 20 to 70 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• age 20~70
• body mass index > 25 kg/m2
• patient who needs surgery with laryngeal mask airway

Exclusion criteria

• difficult airway
• upper airway infection or disease of airway
• history of gastroesophageal reflux
• history of head and neck surgery

Trial design

Primary purpose: Prevention

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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100 participants in 2 patient groups

ideal body weight

Experimental group

Description:

LMA size based on ideal body weight

Treatment:

Device: ideal body weight based size

actual body weight

Experimental group

Description:

LMA size according to actual body weight

Treatment:

Device: actual body weight based size