Selection of Laryngeal Mask Airway in Patients With Slender Somatotype

Not Applicable

• Conditions: Size of Laryngeal Mask Airway; Complication; Success Rate of First Attempt; Body Weight
• Interventions: Device: Laryngeal Mask Airway

• Registration Number: NCT02732613
• Lead Sponsor: XiQiang Huang

Brief Summary

The size selection of Laryngeal Mask Airway classic is usually followed the manufacturer's recommendation based on the patient's ideal weight. But sometimes the patient is tall and slim, the actual weight is much less than the ideal weight. This phenomenon might affect the success rate of insertion. Previous studies had demonstrated that the selection of Laryngeal Mask Airway size based on ideal weight could improve the success rate of insertion; therefore, this study was designed to prove whether this conclusion also applies to the tall and thin patients.

Detailed Description

One hundred and eighteen patients adult patients，actual body weight much less than ideal body weight will be assigned randomly to two groups (Actual weight Group or Ideal weight Group). Size selection was guided by the recommendations of manufacturer, patients will be based on the actual body weight in Actual weight Group while ideal body weight in Ideal weight Group.

The success rate of first attempt，number of adjustments, insertion time, ease of insertion, overall success rate, oropharyngeal leak pressure and fiberoptic view will be recorded and compared. The occurrences of respiratory complications such as sore throat, hoarseness, and dysphonia will be observed and recorded.

Study Timeline

• Study First Submitted: 2016-03-28
• Status Verified: 2016-04
• Study Start: 2016-04
• Study First Submitted QC: 2016-04-07
• Last Update Submitted: 2016-04-07
• Study First Posted: 2016-04-08
• Last Update Posted: 2016-04-08
• Primary Completion: 2016-09
• Study Completion: 2016-11

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 118

Inclusion Criteria

1. Adult Patients undergo elective surgery of American Society of Anesthesiologists (ASA) physical status 1-2, aged from 18 to 60;
2. Patients' actual weight much less than ideal weight.

Exclusion Criteria

1. Patients with gastroesophageal reflux disease;
2. Patients with predicted difficult airway;
3. Patients with preexisting airway diseases or significant upper airway infection.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Actual weight Group	Laryngeal Mask Airway	Patients in Actual weight Group: The selection of Laryngeal Mask Airway classic will be based on actual body weight, followed the recommendations of manufacturer (size 3 for weight \< 50 kg, size 4 for weight 50-70 kg, and size 5 for weight \> 70 kg ).
Ideal weight Group	Laryngeal Mask Airway	Patients in Ideal weight Group: The selection of Laryngeal Mask Airway classic will be based on ideal body weight, followed the recommendations of manufacturer ( size 3 for weight \< 50 kg, size 4 for weight 50-70 kg, and size 5 for weight \> 70 kg ).

Primary Outcome Measures

Name	Time	Method
The success rate of Laryngeal Mask Airway first insertion	Six months