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A New Insertion Technique for Laryngeal Mask Airway

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified February 2015 by Northwestern University.
Recruitment status was:  Recruiting
Information provided by (Responsible Party):
Ling Qun Hu, Northwestern University Identifier:
First received: December 11, 2012
Last updated: February 6, 2015
Last verified: February 2015
A laryngeal mask airway ("LMA") is an airway device that is commonly used and placed under general anesthesia to facilitate ventilation of the patient's lungs while anesthetized. It is similar to an "endotracheal tube" (a breathing tube) but is less invasive. It is also placed as a backup when the Anesthesiologist is unable to pass a breathing tube and the patient is not adequately ventilating. Unfortunately, an LMA may lead to complications similar to those of breathing tube placement, such as sore throat and hoarse voice. Previous studies have examined several variables that may affect how often complications occur; these variables include giving anti-inflammatory medications and inflating the LMA to different pressures (the "working" end of the LMA, which rests in the patient's throat, has a cuff that is inflated to provide a seal). We are studying the effect of the PLACEMENT TECHNIQUE on postoperative sore throat, hoarse voice, and difficulty swallowing. We will be using 3 placement techniques - the traditional placement technique, a slightly different traditional placement technique, and a new technique, abbreviated the "ELLIA" method. The hypothesis of this study is that a new LMA insertion technique will have no difference in postoperative pharyngolaryngeal morbidity including sore throat, dysphagia and dysphonia.

Condition Intervention
Airway Morbidity
Other: Group 1 Classic
Other: Group 2 pre-inflated
Other: Group 3 ELLIA

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Outcomes Assessor)
Official Title: A New Insertion Technique for Laryngeal Mask Airway

Further study details as provided by Northwestern University:

Primary Outcome Measures:
  • Number of subjects who present with postoperative pharyngolaryngeal complications [ Time Frame: 24 hours ]
    The primary outcomes for this study will be postoperative pharyngolaryngeal complications including sore throat, dysphonia (difficult talking), and dysphagia (difficulty swallowing).

Estimated Enrollment: 450
Study Start Date: November 2011
Estimated Study Completion Date: December 2016
Estimated Primary Completion Date: December 2016 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: Group 1 classic
Group 1 Using the classic inserting technique and completely deflated LMA recommended in the LMA manual.
Other: Group 1 Classic

Active Comparator: Group 1 classic

Group 1 Using the classic inserting technique and completely deflated LMA recommended in the LMA manual.

Active Comparator: Group 2 pre inflated
Group 2 (pre-inflated): Using the recommended inserting technique with the pre-inflated volume that exists in a LMA from the manufacturer
Other: Group 2 pre-inflated
Group 2 (pre-inflated): Using the recommended inserting technique with the pre-inflated volume that exists in a LMA from the manufacturer.
Active Comparator: Group 3 ELLIA technique
Group 3 (ELLIA): Using the ELLIA technique.
Other: Group 3 ELLIA
Group 3 (ELLIA): Using the ELLIA technique

Detailed Description:
The LMA will be inserted based on one of three methods randomly assigned to each patient. The ELLIA technique involves gently lifting the patient's laryngeal structures (throat) while placing the LMA to oppose the force of gravity. Whereas the traditional method of placement involves guiding the LMA through the pharynx with a finger inserted into the pharynx, the ELLIA method avoids this step. General anesthesia will be maintained at the discretion of the Anesthesiologist throughout the surgical procedure. At the end of the case, as would normally occur, the LMA will be removed from the patient's airway and the patient will be taken to the PACU, where he or she will be cared for as usual. At one and two hours postoperatively, blinded research assistants will assess the patient for sore throat, hoarse voice, and difficulty swallowing. Finally, at 24 hours the patient will receive a telephone call from a blinded research assistant assessing for the same outcomes. These data will be collected and presented.

Ages Eligible for Study:   18 Years to 70 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • ASA (American Society of Anesthesiologists patient fitness category) I, II, III
  • Age 18-70
  • General anesthetic for where LMA placement is not contraindicated will be included

Exclusion Criteria:

  • Small mouth opening
  • Preoperative sore throat/dysphagia/dysphonia
  • Patients at increased risk for aspiration
  • Morbid obesity BMI > 40
  • Untreated chronic GERD
  • Pregnancy
  • Suspected supraglottic abnormalities
  • N2O use
  • Need for oral-pharyngeal suctioning
  • Undergoing oral and nasal surgery
  • Intubation or any oral instrumental manipulations other than
  • LMA placements intraoperatively or postoperatively
  Contacts and Locations
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Please refer to this study by its identifier: NCT01749033

Contact: Ling Qun Hu, MD 312-926-8373

United States, Illinois
Northwestern Memorial Hospital Recruiting
Chicago, Illinois, United States, 60611
Contact: Ling Qun Hu, MD    312-926-8373   
Sponsors and Collaborators
Northwestern University
Principal Investigator: Ling Qun Hu, MD Northwestern University
  More Information

Responsible Party: Ling Qun Hu, Principal Investigator, Northwestern University Identifier: NCT01749033     History of Changes
Other Study ID Numbers: STU00046964
Study First Received: December 11, 2012
Last Updated: February 6, 2015

Keywords provided by Northwestern University:
Laryngeal Mask Airway processed this record on April 27, 2017