Bronchodilators and Oxygen Kinetics With Exercise in Chronic Obstructive Pulmonary Disease (COPD) Patients

Bronchodilator Effect on O2 Deficit and V'O2 Kinetics During Moderate Intensity Exercise in Normoxemic COPD.

Hypothesis: The reduction of dynamic hyperinflation and its negative effects on the respiratory system following a bronchodilator could lead to an improvement of cardiac function in terms of increased cardiac output. This may enhance oxygen delivery to the exercising muscles in COPD patients. Bronchodilator administration may also have an indirect effect on V'O2 kinetics via its action on cardiovascular and pulmonary variables.

Objectives:

1. To evaluate the effects of a bronchodilators on V'E , V'CO2 , and V'O2 kinetics in COPD during constant work-rate cycle exercise, and to evaluate whether bronchodilators will accelerate, indirectly, phase 2 kinetics (usually slower in COPD patients than normal subjects) and shorten t for V'E, V'CO2 , and V'O2 and shorten half-times for HR and O2 pulse, thus showing an improvement of oxygen transport to the peripheral active muscles.
2. To determine the impact of a bronchodilator-induced reduction in dynamic hyperinflation, and its effects on cardiovascular and pulmonary function, on exercise limitation in COPD.

Study Overview

• Status: Completed
• Conditions: Chronic Obstructive Pulmonary Disease
• Intervention / Treatment: Drug: Combivent

Detailed Description

The inability to engage in the usual activities of daily living is one of the most distressing experiences of people afflicted with Chronic Obstructive Pulmonary Disease (COPD). Exercise intolerance progresses relentlessly as the disease advances and can lead to virtual immobility and social isolation. Our understanding of the complex interface between physiological impairment and disability in COPD has increased considerably in recent years. It has become clear that in COPD, exercise intolerance ultimately reflects integrated abnormalities of the ventilatory, cardiovascular, peripheral muscle and neurosensory systems. Ventilatory constraint is the dominant contributor to exercise limitation in more advanced disease. Recently, important studies have been conducted on the role of peripheral muscle dysfunction in exercise limitation in COPD.

The present study will test the hypothesis that the administration of bronchodilators (i.e., inhaled β2-agonist and inhaled anticholinergics in combination) in normoxemic COPD patients during moderate-intensity constant-load exercise may result in an enhancement of oxidative metabolism, reflected by reductions of O2 def and phase 2 tV'O2.

Fifteen normoxemic patients with stable COPD (FEV1 less than 60 % predicted) and severe chronic breathlessness (Baseline Dyspnea Index less than 6) will complete the study.

Each patient will perform three visits. At the first visit, patients will be familiarized with the various questionnaires and scales for rating the intensity and quality of symptoms and they will carry out pulmonary function testing and a symptom-limited incremental cycle exercise test in order to determine the anaerobic threshold (AT), the peak work-rate and the peak oxygen uptake. Each patient will subsequently complete two visits in which they will receive either nebulized bronchodilator (BD) (Combivent®, ipratropium 0.5 mg + salbutamol 2.5 mg) or placebo (PL), in random order. At 90-100 minutes post-dose, patients will perform pulmonary function tests, then they will perform a constant-load exercise test at 80% of AT V'O2. During constant-load exercise tests (2nd and 3rd visit), small samples of blood from the earlobe of each subject will be collected in order to determine the level of lactate and breathing gases (oxygen and carbon dioxide) in the blood.

• Study Type: Interventional
• Enrollment (Actual): 12
• Phase: Phase 4

Contacts and Locations

Study Locations

• Canada
  • Ontario
    • Kingston, Ontario, Canada, K7L 2V7
      • Respiratory Investigation Unit (Queen's University)

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 40 years to 80 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• 40-80 years
• stable COPD
• FEV1 < 60 % predicted
• severe chronic breathlessness (Baseline Dyspnea Index < 6)

Exclusion Criteria:

• SpO2 at rest < 90% or a a sustained decrease of > 4% in arterial O2 saturation during the ergometer test, as determined by pulse oximetry
• a body mass index (BMI) < 19 or > 30
• chronic oral steroid therapy
• other medical conditions which could cause or contribute to breathlessness, i.e., heart disease or other respiratory diseases
• other problem which could interfere with carrying out of exercise testing, i.e., neuromuscular diseases, orthopedic diseases, etc.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Crossover Assignment
• Masking: Triple

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: 1; Combivent	Drug: Combivent; Nebulized Combivent (4 mL) or saline solution (0.9% NaCl) (4 mL) will be administered once only to subjects.; Other Names: Ipratropium - Salbutamol
Placebo Comparator: 2; Saline Solution (0.9% NaCl)	Drug: Combivent; Nebulized Combivent (4 mL) or saline solution (0.9% NaCl) (4 mL) will be administered once only to subjects.; Other Names: Ipratropium - Salbutamol

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
effects of bronchodilators on V'E , V'CO2 , and V'O2 kinetics in COPD during constant work-rate cycle exercise.	2 hours post-inhalation of study drug
evaluate whether bronchodilators will accelerate, indirectly, phase 2 kinetics in COPD	2 hours post-inhalation of study drug
evaluate whether bronchodilators will shorten t for V'E, V'CO2 , and V'O2	2 hours post-inhalation of study drug
evaluate whether bronchodilators will shorten half-times for HR and O2 pulse	2 hours post-inhalation of study drug

Collaborators and Investigators

• Sponsor: Queen's University
• Investigators: Principal Investigator: Denis E O'Donnell, MD, Queen's University

Publications and helpful links

General Publications

• Laveneziana P, Palange P, Ora J, Martolini D, O'Donnell DE. Bronchodilator effect on ventilatory, pulmonary gas exchange, and heart rate kinetics during high-intensity exercise in COPD. Eur J Appl Physiol. 2009 Dec;107(6):633-43. doi: 10.1007/s00421-009-1169-4. Epub 2009 Aug 27.

Study record dates

Study Major Dates

• Study Start: March 1, 2006
• Primary Completion (Actual): July 1, 2009
• Study Completion (Actual): July 1, 2009

Study Registration Dates

• First Submitted: July 18, 2006
• First Submitted That Met QC Criteria: July 18, 2006
• First Posted (Estimate): July 20, 2006

Study Record Updates

• Last Update Posted (Estimate): April 19, 2011
• Last Update Submitted That Met QC Criteria: April 18, 2011
• Last Verified: April 1, 2011

More Information

Terms related to this study

• Keywords: Exercise; COPD; Bronchodilator; Kinetics; Combivent
• Additional Relevant MeSH Terms: Respiratory Tract Diseases; Lung Diseases; Lung Diseases, Obstructive; Pulmonary Disease, Chronic Obstructive; Physiological Effects of Drugs; Neurotransmitter Agents; Molecular Mechanisms of Pharmacological Action; Autonomic Agents; Peripheral Nervous System Agents; Cholinergic Antagonists; Cholinergic Agents; Bronchodilator Agents; Anti-Asthmatic Agents; Respiratory System Agents; Ipratropium
• Other Study ID Numbers: DMED-926-06