Airway Evaluation by McGrath Videolaryngoscope

Study Overview
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Brief Summary
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Difficult tracheal intubation is a cause of severe patient damage and death. There is not a good method to predict it. The McGrath Series 5 video laryngoscope can improve visualization of the glottic structures one to two grades. Moreover unlike a classical laryngoscope with a Macintosh blade, the McGrath provides a view of the glottis without requiring alignment of the oral, pharyngeal and laryngeal axes. In this study, the investigators will use it to compare the Cormack-Lehane score in sedation and anesthesia condition. It helps to know the role of videolaryngoscope in predicting difficult intubation.

Detailed Description
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The enrolled patients were given a bolus of sufentanil 0.3-0.5μg/kg to achieve Ramsay sedation score 2-3. The Cormack-Lehane score in sedation was evaluated by McGrath videolaryngoscope. Then the patients were induced with propofol. A bolus of rocuronium was given to facilitate intubation. The Cormack-Lehane score in anesthesia was recorded when intubated by McGrath videolaryngoscope. BMI, mouth opening, thyromental distance, intubation duration and ramsay sedation score were also recorded. To compare the Cormack-Lehane score in sedate and anesthesia condition

Official Title
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Comparison of Cormack-Lehane Score in Sedation and Anesthesia Condition by McGrath Videolaryngoscope

Conditions
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Anesthesia

Intervention / Treatment
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* Device: McGrath Videolaryngoscope


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: patients scheduled for general surgery under general anesthesia ASA classification 1-3 Exclusion Criteria: emergent operation, aspiration risk a history of difficult airway expected difficult airway incooperative patients with mental diseases, hearing disorders

Ages Eligible for Study
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Minimum Age: 15 Years
Maximum Age: 65 Years

Sexes Eligible for Study
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All

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
Intervention Model: Single Group Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: McGrath Videolaryngoscope<br>to compare the Cormack-Lehane grade in sedation and anesthesia by McGrath videolaryngoscope | Device: McGrath Videolaryngoscope<br>* A kind of portable videolaryngoscopes, produced by Aircraft Medical. It has been used for difficult airway.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Cormack-Lehane score in sedation condition | Based on the Modified Cormack-Lehane classification. 5 degrades. 1-5 | 5 minutes after administration of sufentanil | 
| Cormack-lehane score in anesthesia condition | Based on the Modified Cormack-Lehane classification. 5 degrades. 1-5 | 1 minute after administration of rocuronium | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Duration of intubation | The duration of intubation is defined as the time from inserting videolaryngoscope, intubating a tube, to withdrawing videolaryngoscope using a stopwatch. | At intubation | 
| Sedation score | by Ramsay sedation score 1-6. The higher score, the deeper sedation | 5 minutes after administraion of sufentanil | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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videolaryngoscope, tracheal intubation, Cormack-Lehane grade, airway evaluation, sedation, anesthesia