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LMA Cuff Pressure and LMA-induced Complications

This study has been completed.
Information provided by (Responsible Party):
Christopher B. Robards, Mayo Clinic Identifier:
First received: June 28, 2011
Last updated: November 5, 2015
Last verified: November 2015
The purpose of this study is to determine if using 20 mL B.Braun syringes to inflate LMAs and allowing them to recoil will put the pressure of the LMA cuff within the safety range. It will also determine if remaining within this safety range has an effect on complications after surgery..

Condition Intervention
Sore Throat
Device: Standard inflation of LMA cuff
Device: Pressure check with syringe recoil
Device: Pressure check by pressure transducer

Study Type: Observational
Study Design: Observational Model: Case Control
Time Perspective: Prospective
Official Title: Using the Natural Recoil of the Inflating Syringe as a Safety Valve to Limit LMA Cuff Pressure and Decrease LMA-Induced Complications

Further study details as provided by Mayo Clinic:

Primary Outcome Measures:
  • Pressure of the syringe after inflation of the LMA cuff [ Time Frame: after inflation, 1 hour into surgery ] [ Designated as safety issue: Yes ]

Secondary Outcome Measures:
  • Number of patients with dysphagia and/or dysphonia [ Time Frame: 1, 2, and 24 hours after surgery ] [ Designated as safety issue: No ]

Enrollment: 360
Study Start Date: June 2011
Study Completion Date: April 2013
Primary Completion Date: April 2013 (Final data collection date for primary outcome measure)
Groups/Cohorts Assigned Interventions
Standard Practice Device: Standard inflation of LMA cuff
LMA cuff will be inflated per standard practice with a syringe and resulting cuff pressure will be measured by manual palpation of the cuff per standard practice.
Other Name: LMA inflation routine clinical practice
Syringe recoil Device: Pressure check with syringe recoil
LMA cuff will be inflated per standard practice with a syringe and resulting cuff pressure will be measured by syringe recoil
Other Name: LMA cuff pressure by syringe recoil
Pressure Transducer Device: Pressure check by pressure transducer
LMA cuff will be inflated per standard practice with a syringe and resulting cuff pressure will be measured by pressure transducer.
Other Name: LMA cuff pressure checked by pressure transducer


Ages Eligible for Study:   18 Years to 99 Years   (Adult, Senior)
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Sampling Method:   Probability Sample
Study Population
Patients scheduled to undergo a surgical procedure less than 2 hours in duration

Inclusion Criteria:

  • Registered Mayo Clinic in Florida patients scheduled to undergo a surgery
  • Planned use of LMA during surgery
  • between the ages of 18-99
  • short duration (<2 hours elective surgery)

Exclusion Criteria:

  • recent history of upper respiratory tract infection
  • intra-cavitary or laparoscopic procedure
  • risk of pulmonary aspiration
  • known difficult airway
  • history of gastric reflux
  • BMI > 40
  • lateral or prone positions
  • oral or nasal surgery
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01385969

United States, Florida
University of Florida College of Medicine
Gainesville, Florida, United States, 32610
Mayo Clinic
Jacksonville, Florida, United States, 32224
Sponsors and Collaborators
Mayo Clinic
Principal Investigator: Christopher Robards, MD Mayo Clinic
  More Information

Responsible Party: Christopher B. Robards, MD, Mayo Clinic Identifier: NCT01385969     History of Changes
Other Study ID Numbers: 11-001506 
Study First Received: June 28, 2011
Last Updated: November 5, 2015
Health Authority: United States: Food and Drug Administration
United States: Institutional Review Board

Keywords provided by Mayo Clinic:
overinflation of LMAs

Additional relevant MeSH terms:
Deglutition Disorders
Esophageal Diseases
Gastrointestinal Diseases
Digestive System Diseases
Pharyngeal Diseases
Otorhinolaryngologic Diseases
Stomatognathic Diseases
Respiratory Tract Infections
Respiratory Tract Diseases
Voice Disorders
Laryngeal Diseases
Neurologic Manifestations
Nervous System Diseases
Signs and Symptoms processed this record on October 27, 2016