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Completed

NCT Number: NCT01679262

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.

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Key information

Conditions

Ear,Nose and Throat Surgery

Age range

20 year–70 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Wyun Kon Park, Yonsei University College of Medicine, Department of Anesthesiology and Pain Medicine

Seoul, 120-752, South Korea

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

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

Treatment and study plan

Guedel type color-coded OPAs

Device

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 When the size of OPAs was longer than distance from the incisors to the tip of the epiglottis, OPAs were partly withdrawn and repositioned the distal end of OPAs is placed just above the tip of epiglottis.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. .

Primary outcomes

  1. Optimal size of OPA

    Time frame: 1 min after each FOB measurement

    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.

Sponsors and collaborators

Lead sponsor

Yonsei University

Other

Registry information

Important dates

Study start
2010
Primary completion
2012
Study completion
2012
First posted
Sep 5, 2012
Registry last updated
Sep 5, 2012

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

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This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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