Measurement of Tracheobronchial Tree Using 3D CT

• Conditions: Double Lumen Tube; Computed Tomography

• Registration Number: NCT03378180
• Lead Sponsor: Seoul National University Hospital

Brief Summary

Anatomical variations of right main bronchus have been discouraged anesthesiologists' use of right-sided double lumen tubes to facilitate one-lung anesthesia. However, there are absolute indications of right-sided DLTs surgically, such as left pneumonectomy or in cases with left main endobronchial lesions.

With recent advances of 3-dimensional spiral CT reconstruction technique, the investigators conducted this retrospective study to measure accurate length of right and left main bronchus and the angle between the center of the right main bronchus and right upper lobe orifice in axial image to help choosing and further manufacturing right-sided double-lumen tubes.

Detailed Description

All CT images will be reviewed using the image measurement software with a slice thickness of 1 mm. A level of -450 Hounsfield units and a width of 1000 Hounsfield units were used for bronchial window settings.

The length of right and left main bronchus will be measured from the tracheal bifurcation to the point of their first branches, respectively, in both 2D- and 3D-CT images. The anteroposterior angulation of right upper lobar bronchus will be measured from the axial 2D-images by the angle between the horizontal midline of the right main bronchus and the center of the RUL orifice which indicates the origin of the RUL bronchus in which the right upper lobar bronchus shows maximal diameter.

Study Timeline

• Status Verified: 2017-12
• Study First Submitted: 2017-12-11
• Study First Submitted QC: 2017-12-17
• Last Update Submitted: 2017-12-17
• Study First Posted: 2017-12-19
• Last Update Posted: 2017-12-19
• Study Start: 2017-12-25
• Primary Completion: 2018-02-20
• Study Completion: 2018-03-30

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 400

Inclusion Criteria

• 3D- thoracic CT scan images obtained between March 1st and October 31th, 2016

Exclusion Criteria

• younger than 18
• with intraluminal lesions in main bronchus
• with abnormalities of tracheobronchial tree
• with history of tracheobronchial injury or surgery
• diagnosed musculoskeletal deformity.

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
right upper lobe orifice	through study completion, an average of 1 year	the angle between the center of the right main bronchus and right upper lobe orifice in axial image

Secondary Outcome Measures

Name	Time	Method
length of right and left main bronchus	through study completion, an average of 1 year	accurate length of both main stem bronchi measured by 3D CT

Trial Locations

Locations (1)

Seoul National University Hospital; 🇰🇷 Seoul, Korea, Republic of