The Influence of Degree of Head Elevation on Insertion Success for ProSeal Laryngeal Mask Airway Insertion

National Medical Center, Seoul

Status: Completed

Conditions: Anesthesia

Treatments: Device: Insertion of ProSeal laryngeal mask airway

Study type: Interventional

Funder types: Other

Identifiers

NCT02058030

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Details and patient eligibility

About

Background - The purpose of the present study is to evaluate the success and pharyngeal trauma when 3 or 6 cm height of pillow is used for the ProSealTM laryngeal mask airway insertion

Methods

• This prospective randomized, controlled study included 80 adult patients . In the 3 cm (n=40) or 6 cm group (n=40), the PLMA was inserted while the head is placed on the 3 cm or 6 cm height of pillow. The success rate at first and second attempt, insertion time, blood staining on cuff, sore throat and hoarseness were assessed.

Full description

Background: The "sniffing position" (i.e., the neck flexed and head extended by means of a pillow) eases tracheal intubation because the three axes, namely, the axis of the mouth, the pharyngeal axis and the laryngeal axis, are put in almost a straight line. The benefit of the sniffing position that align three axis could possibly be applicable when the ProSeal LMA is inserted. For the endotracheal intubation, it has been recommended to elevate the patient's head 8 to 10 cm with pads under the occiput (shoulder remaining on the table) and extend the head at the atlanto-occipital joint to align the oral, pharyngeal, and laryngeal axes such that the passage and line of vision from the lips to the glottic opening are most nearly a straight line.

There have been several clinical studies about the effect of head and neck position including neutral, flexion or extension on the ease of LMA insertion.

However, it has not been much recommended or investigated about the influence of head elevation on the insertion success of PLMA until now. The purpose of the present study is to evaluate the success and pharyngeal trauma when 3 or 6 cm height of pillow is used for the ProSeal laryngeal mask airway insertion in adult patients.

Enrollment: 80 patients

Sex: All

Ages: 18 to 80 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• American Society of Anesthesiologists physical status 1-2
• scheduled for minor surgery in the supine position were enrolled

Exclusion criteria

• cardiorespiratory disease patients
• patients were at risk of aspiration

Trial design

80 participants in 2 patient groups

3cm head elevation

Other group

Description:

Insertion of ProSeal laryngeal mask airway

Treatment:

Device: Insertion of ProSeal laryngeal mask airway

6cm head elevation

Active Comparator group

Description:

Insertion of ProSeal laryngeal mask airway

Treatment:

Device: Insertion of ProSeal laryngeal mask airway