Adequate Bending Angle of a Lightwand

Study Overview
=================
Brief Summary
-----------------
For tracheal intubation with a lightwand, adequate bending angle was not exactly investigated. The purpose of the study is compare three bending angles of lightwands for safe and efficient tracheal intubation.

Detailed Description
-----------------
Lightwands are very useful device for difficult airway management due to small moth opening, weak teeth, and cervical spine instability. Experienced clinicians use a lightwand while bending it adequately. However, there has been not previous studies to investigate the adequate angle to bend it. This randomized controlled trial is to compare three angles (70, 80, and 90 degrees) as bending angle of lightwands for safe and efficient tracheal intubation in cases which require the use of lightwands.

Official Title
-----------------
Adequate Bending Angle of a Lightwand for Tracheal Intubation

Conditions
-----------------
Tracheal Intubation

Intervention / Treatment
-----------------
* Procedure: bending angle of a lightwand


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: patients who require use of a lightwand for tracheal tubes (i.e. small mouth opening, weak teeth, cervical spine instability) Exclusion Criteria: patients who refuse to participate the study

Ages Eligible for Study
-----------------
Minimum Age: 18 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------

Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 70 degrees<br>During tracheal intubation using a lightwand, the tracheal tube combined with a lightwand will be bent by 70 degrees. | Procedure: bending angle of a lightwand<br>* For tracheal intubation, investigators will bend the tracheal tube combined a lightwand by assigned angles (70, 80, or 90 degrees) for each patient. Next a practitioner will perform tracheal intubation with the bent tube.<br>|
| Experimental: 80 degrees<br>During tracheal intubation using a lightwand, the tracheal tube combined with a lightwand will be bent by 80 degrees. | Procedure: bending angle of a lightwand<br>* For tracheal intubation, investigators will bend the tracheal tube combined a lightwand by assigned angles (70, 80, or 90 degrees) for each patient. Next a practitioner will perform tracheal intubation with the bent tube.<br>|
| Experimental: 90 degrees<br>During tracheal intubation using a lightwand, the tracheal tube combined with a lightwand will be bent by 90 degrees. | Procedure: bending angle of a lightwand<br>* For tracheal intubation, investigators will bend the tracheal tube combined a lightwand by assigned angles (70, 80, or 90 degrees) for each patient. Next a practitioner will perform tracheal intubation with the bent tube.<br>|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| sore throat | After surgery, investigators evaluate VAS score for sore throat of the patients. | After surgery | 
| Intubation time | from initiation of tracheal intubation with a lightwand after bending it to completion of tracheal intubation | Intraoperative | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
Tracheal Intubation, Lightwand