Site and Mechanism(s) of Expiratory Airflow Limitation in COPD, Emphysema and Asthma-COPD Overlap

Emphysema Clinical Trial

Official title:

Site and Mechanism(s) of Expiratory Airflow Limitation in COPD, Emphysema and Asthma-COPD Overlap

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT03263130
• Other study ID #: 1234567
• Status: Recruiting
• Start date: January 1, 2017
• Est. completion date: December 1, 2027

Study information

• Verified date: October 2023
• Source: Gelb, Arthur F., M.D.
• Contact: Arthur F Gelb, MD
• Phone: 562-633-2204
• Email: afgelb[@]msn.com
• Is FDA regulated: No
• Study type: Observational [Patient Registry]

Clinical Trial Summary

The purpose of this cross-sectional, observational study is to evaluate the site and mechanism(s) for expiratory airflow limitation in chronic, treated, current or former smokers (>15 pack years) with COPD, Emphysema, and Asthma-COPD Overlap with mild to severe expiratory airflow limitation. Treatment may include short and long acting inhaled beta2agonists, short and long acting inhaled muscarinic receptor antagonists, inhaled and or oral corticosteroid, oral antibiotic, supplemental oxygen, and PDE type 4 inhibitor. In some cases, the patient may have had a history of asthma preceding the development of COPD (Asthma COPD Overlap).

Description:

The investigators are interested in determining the predominant site of expiratory airflow limitation including large central airways vs small peripheral airways/alveoli. In mild to moderate obstructive airways disease and emphysema, I believe routine spirometry including FEV 1(L), FVC (L), and FEV 1/FVC % may be normal, despite expiratory airflow limitation in lung peripheral airways. I also want to determine whether the mechanism(s) of expiratory airflow limitation are related to measured loss of lung elastic recoil or intrinsic obstruction of small peripheral airways or both. It is also important to determine the extent and distribution of emphysema using high resolution, thin section lung CT with voxel quantification. If available pathological analysis of lung surgical specimens and also formalin inflated lungs obtained at autopsy will also be studied. Blood studies will include but not limited to CBC, serum IgE, complete metabolic panel, and alpha 1 antitrypsin levels. Extensive lung function testing will also include spirometry tests before and after inhaled albuterol bronchodilation, lung volumes measured in a plethysmograph, diffusing capacity, measurement of lung elasticity that requires placement of an esophageal balloon, measurement of airflow after breathing a mixture of 80% helium-20%oxygen for 7-10 minutes, and measurements of exhaled nitric oxide. CAT scans of the lungs will be obtained to evaluate the presence, extent and distribution of emphysema and bronchiectasis. In some cases, bronchoscopy may be requested.

The above tests may be uncomfortable but should cause no harm.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 60
• Est. completion date: December 1, 2027
• Est. primary completion date: January 1, 2027
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 30 Years and older

Eligibility

Inclusion Criteria:

• asthma- copd overlap

• emphysema in smokers with smoking history > 15 pack years

• COPD/ bronchitis and bronchiectasis in smokers with smoking history

• >15 pack years

Exclusion Criteria:other pulmonary or systemic diagnosis

• non smokers

• any other pulmonary diagnosis

• pulmonary fibrosis

Related Conditions & MeSH terms

• Asthma
• COPD, Emphysema, Asthma COPD Overlap
• Emphysema
• Pulmonary Emphysema

Intervention

Other:
• As above: diagnosis: COPD, Emphysema, Asthma-COPD Overlap

Locations

Country	Name	City	State
United States	Arthur F Gelb MD	Lakewood	California
United States	Arthur F Gelb MD	Lakewood	California

Sponsors (1)

Lead Sponsor	Collaborator
Gelb, Arthur F., M.D.

Country where clinical trial is conducted

United States, 

References & Publications (18)

Alcaide AB, Sanchez-Salcedo P, Bastarrika G, Campo A, Berto J, Ocon MD, Fernandez-Montero A, Celli BR, Zulueta JJ, de-Torres JP. Clinical Features of Smokers With Radiological Emphysema But Without Airway Limitation. Chest. 2017 Feb;151(2):358-365. doi: 1 — View Citation

Gelb AF, Gold WM, Wright RR, Bruch HR, Nadel JA. Physiologic diagnosis of subclinical emphysema. Am Rev Respir Dis. 1973 Jan;107(1):50-63. doi: 10.1164/arrd.1973.107.1.50. No abstract available. — View Citation

Gelb AF, Hogg JC, Muller NL, Schein MJ, Kuei J, Tashkin DP, Epstein JD, Kollin J, Green RH, Zamel N, Elliott WM, Hadjiaghai L. Contribution of emphysema and small airways in COPD. Chest. 1996 Feb;109(2):353-9. doi: 10.1378/chest.109.2.353. — View Citation

Gelb AF, Schein M, Kuei J, Tashkin DP, Muller NL, Hogg JC, Epstein JD, Zamel N. Limited contribution of emphysema in advanced chronic obstructive pulmonary disease. Am Rev Respir Dis. 1993 May;147(5):1157-61. doi: 10.1164/ajrccm/147.5.1157. — View Citation

Gelb AF, Williams AJ, Zamel N. Spirometry. FEV1 vs FEF25-75 percent. Chest. 1983 Oct;84(4):473-4. doi: 10.1378/chest.84.4.473. No abstract available. — View Citation

Gelb AF, Yamamoto A, Mauad T, Kollin J, Schein MJ, Nadel JA. Unsuspected mild emphysema in nonsmoking patients with chronic asthma with persistent airway obstruction. J Allergy Clin Immunol. 2014 Jan;133(1):263-5.e1-3. doi: 10.1016/j.jaci.2013.09.045. Epu — View Citation

Gelb AF, Yamamoto A, Verbeken EK, Nadel JA. Unraveling the Pathophysiology of the Asthma-COPD Overlap Syndrome: Unsuspected Mild Centrilobular Emphysema Is Responsible for Loss of Lung Elastic Recoil in Never Smokers With Asthma With Persistent Expiratory — View Citation

Gelb AF, Yamamoto A, Verbeken EK, Schein MJ, Moridzadeh R, Tran D, Fraser C, Barbers R, Elatre W, Koss MN, Glassy EF, Nadel JA. Further Studies of Unsuspected Emphysema in Nonsmoking Patients With Asthma With Persistent Expiratory Airflow Obstruction. Che — View Citation

Gelb AF, Zamel N. Simplified diagnosis of small-airway obstruction. N Engl J Med. 1973 Feb 22;288(8):395-8. doi: 10.1056/NEJM197302222880805. No abstract available. — View Citation

Harvey BG, Strulovici-Barel Y, Kaner RJ, Sanders A, Vincent TL, Mezey JG, Crystal RG. Risk of COPD with obstruction in active smokers with normal spirometry and reduced diffusion capacity. Eur Respir J. 2015 Dec;46(6):1589-1597. doi: 10.1183/13993003.0237 — View Citation

Johns DP, Walters JA, Walters EH. Diagnosis and early detection of COPD using spirometry. J Thorac Dis. 2014 Nov;6(11):1557-69. doi: 10.3978/j.issn.2072-1439.2014.08.18. — View Citation

Mannino DM, Make BJ. Is it time to move beyond the "O" in early COPD? Eur Respir J. 2015 Dec;46(6):1535-7. doi: 10.1183/13993003.01436-2015. No abstract available. — View Citation

Martinez CH, Diaz AA, Meldrum C, Curtis JL, Cooper CB, Pirozzi C, Kanner RE, Paine R 3rd, Woodruff PG, Bleecker ER, Hansel NN, Barr RG, Marchetti N, Criner GJ, Kazerooni EA, Hoffman EA, Ross BD, Galban CJ, Cigolle CT, Martinez FJ, Han MK; SPIROMICS Invest — View Citation

Qaseem A, Wilt TJ, Weinberger SE, Hanania NA, Criner G, van der Molen T, Marciniuk DD, Denberg T, Schunemann H, Wedzicha W, MacDonald R, Shekelle P; American College of Physicians; American College of Chest Physicians; American Thoracic Society; European — View Citation

Regan EA, Lynch DA, Curran-Everett D, Curtis JL, Austin JH, Grenier PA, Kauczor HU, Bailey WC, DeMeo DL, Casaburi RH, Friedman P, Van Beek EJ, Hokanson JE, Bowler RP, Beaty TH, Washko GR, Han MK, Kim V, Kim SS, Yagihashi K, Washington L, McEvoy CE, Tanner — View Citation

Rennard SI, Drummond MB. Early chronic obstructive pulmonary disease: definition, assessment, and prevention. Lancet. 2015 May 2;385(9979):1778-1788. doi: 10.1016/S0140-6736(15)60647-X. — View Citation

Rodriguez-Roisin R, Han MK, Vestbo J, Wedzicha JA, Woodruff PG, Martinez FJ. Chronic Respiratory Symptoms with Normal Spirometry. A Reliable Clinical Entity? Am J Respir Crit Care Med. 2017 Jan 1;195(1):17-22. doi: 10.1164/rccm.201607-1376PP. No abstract — View Citation

Woodruff PG, Barr RG, Bleecker E, Christenson SA, Couper D, Curtis JL, Gouskova NA, Hansel NN, Hoffman EA, Kanner RE, Kleerup E, Lazarus SC, Martinez FJ, Paine R 3rd, Rennard S, Tashkin DP, Han MK; SPIROMICS Research Group. Clinical Significance of Sympto — View Citation

* Note: There are 18 references in all — Click here to view all references

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Site and Mechanism(s) of Expiratory Airflow Limitation	Contribution of loss of lung lastic recoil vs intrinsic airway obstruction	4 years