Relationship Between Optimal Laryngeal Mask Airway Cuff Volume and Physical Examination of Head and Neck

Prediction of Optimal Laryngeal Mask Airway Cuff Volume From Parameters of Physical Examination of Head and Neck

Status

Completed

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT02502422

Acronym

RCVPE

Enrollment

170

Registered

2015-07-20

Start date

2015-08-31

Completion date

2015-12-31

Last updated

2016-02-17

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Anesthesia

Keywords

Laryngeal mask airway

Brief summary

Overinflation of laryngeal mask airway cuff increase side effect like hoarseness, vocal cord paralysis, sorethroat. The investigators will study correlation between laryngeal mask airway cuff volume and pressure and physical examination of head and neck.

Detailed description

Overinflation of laryngeal mask airway cuff can induce side effects like hoarseness, vocal cord paralysis, sorethroat. Some study revealed that 60cmH2O of intracuff pressure is maximum pressure which is not increase side effect. The manufacturer recommends that the cuff is inflated with the minimum volume of air required to provide an effective seal(max volume - size 3, 20 ml; size 4, 30 ml; size 5, 40). The investigators will measure anatomical structure (neck circumference, neck length, thyroid-mental distance, etc.) which can influence cuff volume and pressure and find correlation between cuff volume and physical figure measured.

Interventions

DEVICEClassic laryngeal mask airway

1. measurement of head and neck * Ht,Wt,BMI, neck circumference above a thyroid cartilage, mandible circumference( from the lower part of earlobe-mandible angle-mentum-mandible angle to the lower part of earlobe), neck length (mastoid tip\ sternal notch), modified mallampati classification under sitting position, thyromental distance. 2. laryngeal mask airway insertion and measuring cuff pressure by pressure transducer * \# 4.0 for female, #5.0 for male * initial cuff volume(air) : maximum volume recommended by the manufacturer * check pressure : if it exceed 60cmH20, we will remove air until 60cmH20 * remove air until gas leak occured around the cuff under airway pressure 15cmH20, fresh gas flow 6liters/min. Check the volume and pressure just before leakage occured.

Study design

Allocation

Intervention model

SINGLE_GROUP

Primary purpose

SCREENING

Masking

NONE

Eligibility

Sex/Gender

ALL

Age

19 Years to 65 Years

Healthy volunteers

Inclusion criteria

* Adult (age 19-65) * American Society of Anesthesiology Classification I-III

Exclusion criteria

* cardiovascular disease, cerebrovascular disease, pulmonary disease * patient who have operation history for airway * patient who expected difficult intubation * patient who have risk of aspiration

Design outcomes

Primary

Measure	Time frame	Description
optimal laryngeal mask airway cuff volume	20minutes	◦The investigators remove air until gas leak occured around the cuff under airway pressure 15cm H20, fresh gas flow 6liters/min. Check the volume and pressure just before leakage occured.

Countries

South Korea

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026