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Effects of Nycthemeral Variations on Computed Tomography (CT) Parameters Reflecting Airways Remodelling, and Pulmonary Emphysema Extent in Chronic Obstructive Pulmonary Disease (COPD)

Completed
Conditions
COPD
CT
Nycthemeron
Interventions
Radiation: Chest CT scan
Registration Number
NCT01192932
Lead Sponsor
Erasme University Hospital
Brief Summary

Computed tomography (CT) studies considering bronchial dimensions in chronic obstructive pulmonary disease (COPD) have never considered nycthemeral variations. Airway calibre, in COPD patients, exhibits a nycthemeral variations with maximal values around noon and minimal values in the early morning, that persists under long-acting bronchodilator. Furthermore, no study has assessed the possible nycthemeral variations of CT scans parameters reflecting airway remodelling and emphysema extent in COPD patients.

This is a prospective study whose purpose is to assess these variations and their relationships with pulmonary function testing (PFT) in COPD patients.

Detailed Description

Patients : COPD patients aged 40 years or more, with a smoking history of \> 10 pack-years (PY), a post-bronchodilator forced expiratory volume in one second to vital capacity ratio (FEV1/VC) \< 0.7 and an optimal treatment according to GOLD guidelines will be included. Exclusion criteria are: COPD exacerbation or respiratory infection in the 4 weeks before the begin of the study, concomitant pulmonary disease (tuberculosis, significant bronchiectasis, lung cancer), pulmonary resection, active malignancy or malignancy of any organ system within the past 5 years.

Procedures: All measurements will be performed on the same day, after obtaining the written informed consent of the patient. Medical history, smoking status and patient's treatment will be collected.

At 08:00 AM (T0): PFT will be performed, including vital capacity (VC), forced vital capacity (FVC), functional residual capacity (FRC), total lung capacity (TLC), residual volume (RV), forced expiratory volume in one second (FEV1), diffusion lung capacity for carbon monoxide (DLCO), and alveolar volume (VA) measurements (either in absolute values and percentage of predicted values). A first CT scan will be performed using the following technique:

* Supine CT scan after full inspiration.

* Acquisition parameters: (Topogram 35 mA 120 kV 512 mm length) 90 quality ref mAs with care-dose ON 120 kV Pitch 1.4 Rotation time 0.33 s Acquired images 64 x 0.6 mm

* Reconstructions parameters: B60f 1mm-thick every 0.7 mm, B20f 1mm-thick every 10.0 mm, B35f 1mm-thick every 0.7 mm, B60f 5mm-thick every 5.0 mm and B35f 5mm-thick every 5.0 mm

At 04:00 PM (T0+8h): PFT will be performed, including vital capacity (VC), forced vital capacity (FVC), functional residual capacity (FRC), total lung capacity (TLC), residual volume (RV), forced expiratory volume in one second (FEV1), diffusion lung capacity for carbon monoxide (DLCO), and alveolar volume (VA) measurements (either in absolute values and percentage of predicted values). A second CT scan will be performed using the following technique:

* Supine CT scan after full inspiration.

* Acquisition parameters: (Topogram 35 mA 120 kV 512 mm length) 90 quality ref mAs with care-dose ON 120 kV Pitch 1.4 Rotation time 0.33 s Acquired images 64 x 0.6 mm

* Reconstructions parameters: B60f 1mm-thick every 0.7 mm, B20f 1mm-thick every 10.0 mm, B35f 1mm-thick every 0.7 mm, B60f 5mm-thick every 5.0 mm and B35f 5mm-thick every 5.0 mm

Data analysis:

* Emphysema index: from B20f reconstructions, calculation of RA960 using Pulmo CT software.

* Airway index: from B60f reconstructions (1mm-thick every 0.7 mm), calculations of luminal area and wall area for several bronchi.

Statistical analyses : Comparisons of CT parameters values or derived values (for example : wall area to airway area ratio) reflecting emphysema and airways remodelling measured on CT scans obtained à T0 and T0+8h. Correlations with PFT values and derived values.

Recruitment & Eligibility

Status
COMPLETED
Sex
All
Target Recruitment
20
Inclusion Criteria
  • age 40 or more
  • smoking history > 10 pack-years
  • post bronchodilator FEV1/VC < 0.7
  • optimal treatment according to GOLD guidelines
Exclusion Criteria
  • COPD exacerbation or infection in the 4 weeks before the study
  • concomitant pulmonary disease (tuberculosis, significant bronchiectasis, lung cancer)
  • pulmonary resection
  • active malignancy or malignancy of any organ system within the past 5 years

Study & Design

Study Type
OBSERVATIONAL
Study Design
Not specified
Arm && Interventions
GroupInterventionDescription
COPDChest CT scanCOPD patients aged 40 or more, with a smoking history of \> 10 pack-years, a post-bronchodilator FEV1/VC \< 0.7 and an optimal treatment according to GOLD guidelines will be included. Exclusion criteria are: COPD exacerbation or respiratory infection in the 4 weeks before the begin of the study, concomitant pulmonary disease (tuberculosis, significant bronchiectasis, lung cancer), pulmonary resection, active malignancy or malignancy of any organ system within the past 5 years.
Primary Outcome Measures
NameTimeMethod
Results of CT Thorax parameters reflecting emphysema and airway remodelling4 hours

Data analysis:

* Emphysema index: from B20f reconstructions, calculation of RA960 using Pulmo CT software.

* Airway index: from B60f reconstructions (1mm-thick every 0.7 mm), calculations of luminal area and wall area for several bronchi.

Secondary Outcome Measures
NameTimeMethod
Results of pulmonary function tests4 hours

Pulmonary function tests will be performed in the morning (T0) and in the afternoon (T0+8h): vital capacity (VC), forced vital capacity (FVC), functional residual capacity (FRC), total lung capacity (TLC), residual volume (RV), forced expiratory volume in one second (FEV1), diffusion lung capacity for carbon monoxide will be measured.

Trial Locations

Locations (1)

C.H.U Saint-Pierre

🇧🇪

Brussels, Belgium

C.H.U Saint-Pierre
🇧🇪Brussels, Belgium
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