90° Rotation Technique for LMA FlexibleTM Insertion

Seoul National University

Status: Completed

Conditions: Laryngeal Masks

Treatments: Procedure: 90° rotational technique

Study type: Interventional

Funder types: Other

Identifiers

NCT03028896

SNU-LMA

Details and patient eligibility

About

The 90° rotation technique is known to improve the success rate of conventional LMA but its effect in LMA FlexibleTM is not known. We tried to find if 90° rotation technique could increase the first attempt success rate of the insertion of LMA FlexibleTM compared to standard technique.

Full description

One hundred and sixteen adult patients undergoing breast surgery were randomized to the two insertion techniques. The ease of insertion was assessed by the success rate at the first attempt. Heart rate and mean blood pressure were recorded 1 min before and 1 min after insertion. Postoperative complications were checked.

Enrollment: 132 patients

Sex: Female

Ages: 18 to 65 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• American Society of Anesthesiologists class I - II
• Scheduled for elective breast surgery under general anaesthesia using LMA FlexibleTM

Exclusion criteria

• known difficult airway
• mouth opening less than 2.5 cm
• limited extension of neck
• recent sore throat
• gastroesophageal reflux disease

Trial design

Primary purpose: Other

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Triple Blind

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132 participants in 2 patient groups

standard

No Intervention group

Description:

In the neck flexed and the head extended position, hold mask like a pen with the index finger placed anteriorly at the junction of the cuff and tube, push the mask backwards maintaining pressure against the palate until resistance is felt.

rotational

Experimental group

Description:

After insertion of the entire cuff inside the mouth, the LMA FlexibleTM was rotated counter-clockwise through 90° and was advanced through the right side of the tongue until the resistance was felt, and then was returned back in the hypopharynx.

Treatment:

Procedure: 90° rotational technique