The Comparison of Two Different Methods of Partial Inflation of Cuff for Facile Insertion of Laryngeal Mask Airway in Adult Patients

Yonsei University80 enrolled

Overview

Partial cuff inflation before insertion is generally used for laryngeal mask airway insertion in adult patients. However, it is not proven how much the cuff should be inflated. The aim of this study is to compare efficacy between the method using the resting volume and the method using half the maximum volume for partial cuff inflation.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Masking

DOUBLE

Enrollment

Conditions

General Anesthesia

Interventions

The cuff inflation by the resting volumePROCEDURE

80 patients are randomly allocated into two groups : resting volume group (n=40), half the maximum volume group (n=40). In the resting volume group, the pilot balloon valve is connected to syringe without piston for keeping the valve open to the atmosphere and allowing the pressure within the cuff of LMA to equalize with atmospheric pressure. In the half the maximum volume group, the cuff of LMA is completely emptied and then the cuff is filled with the half the maximum volume.

The cuff inflation by half the maximum volumePROCEDURE

Eligibility

Sex: ALLMin age: 20 YearsMax age: 70 Years

Medical Language ↔ Plain English

Inclusion Criteria: * adult patients (20-70 years of age) scheduled for elective surgery undergoing general anesthesia using LMA-classic size 3-5 Exclusion Criteria: * patients with an abnormal airway, * patients with reactive airway disease, * patients with gastroesophageal reflux disease, * patients with chronic respiratory disease, * or a history of an upper respiratory tract infection

Locations (1)

Severance hospital

Seoul, Seoul, South Korea

Outcomes

Primary Outcomes

The intra-cuff pressure

After insertion of LMA, we confirm adequate ventilation. And then we measure intra-cuff pressure using cuff pressure manometer.

Time frame: approximately 5 to 10 minutes after insertion of LMA.

Secondary Outcomes

leak volume

After confirming adequate ventilation, tidal volumes are measured using spirometer sensor attached anesthesia machine. Five corresponding inspiratory and expiratory tidal volumes are recorded and the difference between these is calculated as the leak volume.

Time frame: approximately 5 to 10 minutes after insertion of LMA.

Data from ClinicalTrials.gov

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