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Intrathoracic tracheal dimensions and shape changes in chronic obstructive pulmonary disease
1Department of Internal Medicine, Chang Gung Memorial Hospital, Taipei, Taiwan R.O.C.
Journal of the Formosan Medical Association = Taiwan Yi Zhi
|January 1, 1994
Summary
Chronic obstructive pulmonary disease (COPD) is linked to wider tracheas. Increased lung volume in COPD patients may push the trachea outwards, altering its shape and aiding diagnosis.
Area of Science:
- Pulmonary Medicine
- Radiology
- Anatomy
Background:
- Intrathoracic tracheal dimension and shape changes are observed in Chronic Obstructive Pulmonary Disease (COPD) patients.
- The underlying causes for these tracheal alterations in COPD remain unclear.
Purpose of the Study:
- To investigate the relationship between COPD and intrathoracic tracheal dimensions.
- To explore the correlation between tracheal shape and lung/chest dimensions in COPD patients.
- To evaluate the diagnostic utility of tracheal index in COPD.
Main Methods:
- Comparative analysis of tracheal dimensions (frontal and lateral diameters) between COPD patients and controls.
- Correlation analysis between tracheal diameters and chest dimensions.
- Calculation and assessment of the tracheal index (FTD/LTD) for diagnostic accuracy.
Main Results:
- Patients with COPD exhibit a significantly larger lateral tracheal diameter (LTD).
- A positive linear correlation exists between LTD and lateral chest diameter in COPD.
- COPD patients present a smaller tracheal index (FTD/LTD), with "saber-sheath trachea" (index < 2/3) showing high specificity (92.9%) but low sensitivity (39.1%) for COPD diagnosis.
Conclusions:
- Increased lung volume in COPD patients likely exerts lateral pressure on the trachea, widening the LTD and narrowing the FTD.
- The "saber-sheath trachea" is a specific radiographic marker for COPD, useful in conjunction with other diagnostic parameters.