Patient Characteristics and Tracheobronchial Anatomy

Study Overview
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Brief Summary
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The clinical use of double lumen tubes and bronchial blockers requires a thorough knowledge of the tracheobronchial anatomy in order to establish the best choice for the patient. The literature is limited regarding major bronchi dimensions. In addition, the measurement method is not always adequate or properly described and some publications have evaluated only the left bronchial diameter. Computed tomography with 3D reconstruction, technical reference, has been little used. The project is to conduct a prospective study to compare patient characteristics (age, height, weight, gender, smoking, sign of chronic obstructive pulmonary disease (if available), and dimensions of the trachea and of the main bronchi from CT scans with 3D reconstruction.

Official Title
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Influence of Patient Characteristics on the Tracheobronchial Anatomy Evaluated by a CT Examination

Conditions
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Anatomy

Intervention / Treatment
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* Other: Questionnaire
* Other: Simplified pulmonary function test


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: patients aged at least 18 years undergoing a CT scan Exclusion Criteria: hospitalized patients, people benefiting from a legal protection.

Ages Eligible for Study
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Minimum Age: 18 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
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Studied population<br>Patients will be questioned about their main characteristics (age, gender, height, weight, smoking), they will also perform a simplified a pulmonary function test (if possible). | Other: Questionnaire<br>* Questionnaire on their main characteristics : age, gender, height, weight, smoking<br>Other: Simplified pulmonary function test<br> <br> |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Relationship between patients' age and the minimum diameter of the left main bronchus | Age (years) and diameter (mm) | 1 year | 
| Relationship between patients' gender and the minimum diameter of the left main bronchus | Gender (male/female) and diameter (mm) | 1 year | 
| Relationship between patients' height and the minimum diameter of the left main bronchus | Height (cm) and diameter (mm) | 1 year | 
| Relationship between patients' weight and the minimum diameter of the left main bronchus | Weight (kg) and diameter (mm) | 1 year | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Relationship between patients functional test and the minimum diameter of the left main bronchus | Forced expiratory volume (% of reference value) and diameter (mm) | 1 year | 
| Relationship between patient characteristics and the measurement of lengths, diameters and cross-sectional areas of the trachea and of right main bronchus |  | 1 year | 
| Validation of automatic measurement of tracheal and bronchial diameters | Comparison between manual and automatic measurement using the software Thoracic VCAR of General Electric | 1 year |