Determination of the Optimal Size of Oropharyngeal Airway; Correlation With External Body Measurements

There are several studies that have measured various oropharyngeal airway space distances using radiological method. However, direct confirmation of optimal size of oropharyneal airways (OPAs) in individual using fiberoptic bronchoscope (FOB) is lacking as now. The purposes of this study were to directly determinate the proper size of OPA in individual by FOB via different sizes of OPA in adults under general anestheisia. Additionally, we examine the relationships among the size of OPA, straight length from the incisors to the tip of the epiglottis by laryngoscopy, patient height, and external facial measurements.

Study Overview

• Status: Completed
• Conditions: Ear,Nose and Throat Surgery
• Intervention / Treatment: Device: Guedel type color-coded OPAs

• Study Type: Interventional
• Enrollment (Actual): 149
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Korea, Republic of
  • Seoul, Korea, Republic of, 120-752
    • Wyun Kon Park, Yonsei University College of Medicine, Department of Anesthesiology and Pain Medicine

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 20 years to 70 years (ADULT, OLDER_ADULT)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• ASA class I-II 2. 20-70 years adults

Exclusion Criteria:

• 1. an abnormal airway anatomy in preoperative radiologic study.
• 2. cervical spine pathology,
• 3. a history of difficult intubation,
• 4. neurologic disease or cardiovascular disease,
• 5. obesity (body mass index ≥ 30 kg m-1),
• 6. dental problem

Study Plan

How is the study designed?

Design Details

• Primary Purpose: PREVENTION
• Allocation: NA
• Interventional Model: SINGLE_GROUP
• Masking: SINGLE

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

OTHER: Optimal size of OPAs

Device: Guedel type color-coded OPAs; The OPAs was used four different sizes as No. 8 (80 mm, green), 9 (90 mm, yellow), 10 (100 mm, red), and 11 (110 mm, orange) in regular sequence. The curvilinear distance from the incisors to the tip of the epiglottis was measured by FOB (Olympus LF-GP; Olympus Optical Co., Tokyo, Japan) with tape marking via each size of OPAs. The distance from the distal end of OPA to the tip of the epiglottis was calculated by the difference between measured distance from the incisors to the tip of the epiglottis via each OPA by FOB and typical distance from the flange to distal end of each OPA via inside tube of OPA. When the size of OPAs was longer than distance from the incisors to the tip of the epiglottis, OPAs were partly withdrawn and repositioned the distal end of OPAs is placed just above the tip of epiglottis. Then, the length from the incisors to the flange of OPAs was measured. .

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Optimal size of OPA	Primary Outcome - 기술(Description) The distance from the distal end of OPA to the tip of the epiglottis was calculated by the difference between measured distance from the incisors to the tip of the epiglottis via each OPA by FOB and typical distance from the flange to distal end of each OPA via inside tube of OPA. When the size of OPAs was longer than distance from the incisors to the tip of the epiglottis, OPAs were partly withdrawn and repositioned the distal end of OPAs is placed just above the tip of epiglottis. Then, the length from the incisors to the flange of OPAs was measured. The optimal size of OPAs in individuals was defined that the distal end of OPA is placed the tip of epiglottis as close as possible without impingement on the epiglottis when the flange of OPA contact with the four central incisors.	1 min after each FOB measurement

Collaborators and Investigators

• Sponsor: Yonsei University

Study record dates

Study Major Dates

• Study Start: May 1, 2010
• Primary Completion (ACTUAL): May 1, 2012
• Study Completion (ACTUAL): May 1, 2012

Study Registration Dates

• First Submitted: August 31, 2012
• First Submitted That Met QC Criteria: August 31, 2012
• First Posted (ESTIMATE): September 5, 2012

Study Record Updates

• Last Update Posted (ESTIMATE): September 5, 2012
• Last Update Submitted That Met QC Criteria: August 31, 2012
• Last Verified: August 1, 2012

More Information

Terms related to this study

• Other Study ID Numbers: 4-2007-0407