Comparison of the Cuff Pressure of a Taper-guard Cuffed Tube Between Ipsilateral and Contralateral Rotation of Head

Study Overview
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Brief Summary
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This study evaluates the endotracheal tube cuff pressure of a taper-guard cuffed tube during tympanoplasty with ipsilateral rotation of head, compared to the contralateral rotation of head. The investigators will performed the ipsilateral rotation of head against the fixed tube in half of participants or the contralateral rotation of head in the other half.

Detailed Description
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The inflation of the endotracheal tube cuff is very useful to prevent aspiration of contaminated substances into lung past endotracheal tube and leakage of gas during positive pressure ventilation. However, excessive inflation of endotracheal tube cuff frequently causes tracheal mucosal damage, which can increase the incidence of sore throat, hoarseness, and coughing after surgery. Taper-guard cuffed tube was newly developed. Taper-guard endotracheal tube is more effective in providing a sealing effect than a cylindrical endotracheal tube in an in vitro study. However, recently, it was reported that the cuff pressure of a Taper-guard endotracheal tube significantly increased after a positional change from the supine to the lateral flank position, compared to that of a cylindrical endotracheal tube. However, during tympanoplasty, the investigators need to rotate head for proper position. In this study, therefore, the investigators investigate the difference of the endotracheal tube cuff pressure of a taper-guard cuffed tube between ipsilateral and contralateral rotation of head against the fixed tube during tympanoplasty.

Official Title
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Comparison of the Endotracheal Tube Cuff Pressure of a Taper-guard Cuffed Tube Between Ipsilateral and Contralateral Rotation of Head During Tympanoplasty; Prospective Study.

Conditions
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Anesthesia, Endotracheal, Airway Management

Intervention / Treatment
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* Procedure: Ipsilateral rotation of head
* Procedure: Contralateral rotation of head


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: American Society of Anesthesiologists physical status classification I-III for a tympanoplasty under general anesthesia Exclusion Criteria: history of difficult intubation, limited neck movement, respiratory diseases, and body mass index >35kg/m2

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 80 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: Screening
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Ipsilateral rotation of head<br>Head was laterally rotated to the same side against fixed tube | Procedure: Ipsilateral rotation of head<br>* Ipsilateral rotation of head against fixed tube<br>|
| Active Comparator: Contralateral rotation of head<br>Head was laterally rotated to the opposite side against fixed tube | Procedure: Contralateral rotation of head<br>* Contralateral rotation of head against fixed tube<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The endotracheal tube cuff pressure | The endotracheal tube cuff pressure was checked using a manometer | During procedure | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The distance from the endotracheal tube tip to the carina | The distance from the endotracheal tube tip to the carina was recorded again using a fiberoptic bronchoscope. | During procedure |