Open, Prospective Pilot Study to Obtain Aerosol Distribution in Asthmatic Patients Using Single Photon Emission Computed Tomography (SPECT) for Comparison With Functional Imaging Using Computer Methods

Open, Prospective Pilot Study to Obtain Aerosol Distribution in Asthmatic Patients Using SPECT-CT for Comparison With Functional Imaging Using Computer Methods

In this open prospective study, 6 well controlled asthmatic patients will undergo a high-resolution multi-slice computed tomography (CT) scan, lung function tests and a SPECT scan to obtain patient specific geometries of the central and peripheral small airways, patient specific boundary conditions and the in-vivo spatial distribution of inhaled aerosols.

Study Overview

• Status: Completed
• Conditions: Asthma
• Intervention / Treatment: Procedure: Computed Tomography; Procedure: Single Photon Emission Computed Tomography

• Study Type: Interventional
• Enrollment (Actual): 6
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Belgium
  • Antwerp
    • Edegem, Antwerp, Belgium, 2650
      • University Hospital Antwerp

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

1. Patients with well controlled asthma as defined by the current GINA guidelines
2. Male or female patients aged ≥18 years
3. Patients with a documented positive response to the reversibility test (i.e. FEV1 increase ≥ 12% and 200mL from baseline value after 4 puffs of 100 µg of inhaled salbutamol pMDI) within the 12 months preceding the screening visit or performed at screening visit after a wash-out of 2 days for long acting β2 agonists or a documented positive response to the methacholine challenge test
4. Patients with a co-operative attitude
5. Written informed consent obtained
6. Patients maintained on stable respiratory medication for 4 weeks prior to visit 1

Exclusion Criteria:

1. Patients who are pregnant or are breast-feeding
2. Inability to carry out pulmonary function testing
3. Diagnosis of COPD as defined by the current GOLD guidelines
4. History of near fatal asthma
5. Hospitalization due to exacerbation or respiratory infection of the airways 4 weeks prior to visit 1
6. Current smokers or ex-smokers
7. Patients with an uncontrolled disease or any condition that might, in the judgement of the investigator, place the patient at undue risk or potentially compromise the results or interpretation of the study
8. Cancer or any other chronic disease with poor prognosis and/or affecting patient status
9. BMI ≥ 35 kg/m2
10. Patients treated with CPAP or BiPAP
11. Known active tuberculosis
12. A history of cystic fibrosis, central bronchiectasis or interstitial lung disease
13. A history of thoracotomy with pulmonary resection
14. Patients unlikely to comply with the protocol or unable to understand the nature, scope and possible consequences of the study
15. Patients who received any investigational new drug within the last 4 weeks prior to the screening visit

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Diagnostic
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Other: 1	Procedure: Computed Tomography; 1 low dose CT scan is taken; Procedure: Single Photon Emission Computed Tomography; 1 SPECT scan is taken

What is the study measuring?

Primary Outcome Measures

Outcome Measure

Measure Description

Deposition of inhaled aerosol

The primary objective of this study is to correlate the deposition distribution of inhaled aerosol obtained using computer methods through comparison with in-vivo SPECT data. The computer methods yield the concentration of particles entering and depositing in a lung lobe based on flow and particle behaviour simulation. The SPECT data yields the same parameter, i.e. particle concentration within each lung lobe, through scintigraphy assessment of the inhaled aerosols.

Secondary Outcome Measures

Outcome Measure	Measure Description
Lobar aerosol deposition	One of the secondary objectives is to assess the variability in lobar deposition between patients with both methods (CT and SPECT).
Sample size estimation for future studies	Another secondary objective of this study is to establish a basis for a power calculation to determine adequate sample size for possible prospective studies.

Collaborators and Investigators

• Sponsor: University Hospital, Antwerp
• Investigators: Principal Investigator: Wilfried A De Backer, MD, PhD, University Hospital, Antwerp

Study record dates

Study Major Dates

• Study Start: July 1, 2009
• Primary Completion (Actual): August 1, 2009
• Study Completion (Actual): August 1, 2009

Study Registration Dates

• First Submitted: August 26, 2009
• First Submitted That Met QC Criteria: August 26, 2009
• First Posted (Estimate): August 27, 2009

Study Record Updates

• Last Update Posted (Estimate): September 16, 2010
• Last Update Submitted That Met QC Criteria: September 15, 2010
• Last Verified: September 1, 2010

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Respiratory Tract Diseases; Immune System Diseases; Lung Diseases; Hypersensitivity, Immediate; Bronchial Diseases; Lung Diseases, Obstructive; Respiratory Hypersensitivity; Hypersensitivity; Asthma
• Other Study ID Numbers: PML_DOC_0901