Modified Laryngeal Handshake Technique

Study Overview
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Brief Summary
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In this study, we compare the conventional laryngeal handshake technique and modified laryngeal handshake technique for locating the cricothyroid membrane in terms of accuracy and speed. The conventional laryngeal handshake technique is performed with the non-dominant hand, identifying the hyoid bone and thyroid laminae, stabilizing the larynx between thumb and middle finger, and moving down the neck to palpate the cricothyroid membrane with the index finger. The modified laryngeal handshake is performed with the non-dominant hand, stabilizing the trachea between thumb and middle finger from the suprasternal notch and moving up the neck to palate the cricoid cartilage and cricothyroid membrane with the index finger.

Official Title
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Modified Laryngeal Handshake Technique for Locating the Cricothyroid Membrane

Conditions
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Airway Complication of Anesthesia

Intervention / Treatment
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* Procedure: Conventional laryngeal handshake technique
* Procedure: Modified laryngeal handshake technique


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients who would be scheduled elective surgery under general anesthesia Exclusion Criteria: Diseases or anatomical abnormalities in the neck or larynx History of neck surgery

Ages Eligible for Study
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Minimum Age: 20 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

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


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Conventional laryngeal handshake technique<br>The conventional laryngeal handshake technique is performed to localize the cricothyroid membrane | Procedure: Conventional laryngeal handshake technique<br>* The conventional laryngeal handshake technique is performed with the non-dominant hand, identifying the hyoid bone and thyroid laminae, stabilizing the larynx between thumb and middle finger, and moving down the neck to palpate the cricothyroid membrane with the index finger.<br>|
| Experimental: Modified laryngeal handshake technique<br>The modified laryngeal handshake is performed to localize the cricothyroid membrane | Procedure: Modified laryngeal handshake technique<br>* The modified laryngeal handshake is performed with the non-dominant hand, stabilizing the trachea between thumb and middle finger from the suprasternal notch and moving up the neck to palate the cricoid cartilage and cricothyroid membrane with the index finger.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The accuracy to localize the cricothyoid membrane | The accuracy of the cricothyroid membrane identified by the conventional and modified handshake techniques are evaluated. | 1 minute after identifying the cricothyroid membrane using the conventional or modified laryngeal handshake technique | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The accuracy to localize the midline of the neck | The accuracy of the midline of the neck identified by the conventional and modified handshake techniques are evaluated. | through the identification of cricothyroid membrane, an average of 5 minutes | 
| The vertical and horizontal distances between the actual and perceived cricothyroid membrane | The vertical and horizontal distances between the actual and perceived cricothyroid membrane using the conventional and modified handshake techniques are evaluated. | through the identification of cricothyroid membrane, an average of 5 minutes | 
| Time to localize the cricothyroid membrane | The time taken to identify the cricothyroid membrane is recorded. | through the identification of cricothyroid membrane, an average of 5 minutes |