An Innovative Approach for Uniblocker Intubation

Study Overview
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Brief Summary
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To measure the distance between the upper edge of the thyroid cartilage to the upper edge of the sternum add the distance from the upper edge of the sternum to the carina was calculated according to the chest CT scans as a guide to the placement of Uniblocker without the aid of FOB.

Detailed Description
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In previous study, the investigators found Chest computed tomography (CT) image can accurately predicting the optimal insertion depth of Uniblocker,however in some hospital the CT scan performed for the preoperative surgical evaluation without the vocal cords slices. If a more extensive CT scan was needed for obtaining a more reliable image of the vocal cords,the additional exposure dose would be a major disadvantage of the method.So the investigators measure the distance between the upper edge of the thyroid cartilage to the upper edge of the sternum add the distance from the upper edge of the sternum to the carina calculated according to the chest CT scans as a guide to the placement of Uniblocker without the aid of FOB.

Official Title
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An Innovative Approach for Accurately Predicting the Optimal Insertion Depth of Uniblocker Without Fiberoptic Bronchoscope Assistance

Conditions
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Therapeutic Procedural Complication

Intervention / Treatment
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* Other: The measured distance
* Other: formula
* Device: Fiberoptic bronchoscope


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Adult patients undergoing left side thoracic surgery The thoracic surgery requiring a Uniblocker for one-lung ventilation Exclusion Criteria: Age>70 or <18 years ASA classifications >III BMI >35kg/m2 Modified Mallampati classification ≥III Thoracic surgery within the last one month Severe cardiopulmonary disease

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 70 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: Other
Allocation: Randomized
Intervention Model: Factorial Assignment
Masking: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: formula<br>Calculate the depth of intubation according to the formula of 0.1977* patient's height - 4.2423 | Other: formula<br>* Calculate the depth of intubation according to the formula of 0.1977* patient's height - 4.2423<br>|
| Experimental: Fiberoptic bronchoscope<br>intubation of Uniblocker under the Under the guidance of Fiberoptic bronchoscope | Device: Fiberoptic bronchoscope<br>* The intubation of Uniblocker under the guidance of Fiberoptic bronchoscope<br>|
| Experimental: The measured distance<br>To measure the distance between the upper edge of the thyroid cartilage to the upper edge of the sternum add the distance from the upper edge of the sternum to the carina calculated according to the chest CT scans as a guide to the placement of Uniblocker without the aid of FOB. | Other: The measured distance<br>* To measure the distance between the upper edge of the thyroid cartilage to the upper edge of the sternum add the distance from the upper edge of the sternum to the carina calculated according to the chest CT scans as a guide to the placement of Uniblocker without the aid of Fiberoptic bronchoscope.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The intubation time | The intubation time defined as the time from the anesthesiologist inserted the video laryngoscope between the teeth of patients until Uniblocker at the optimal position and this was done using a stopwatch. | 1 year |