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Low-dose nebulized morphine does not improve exercise in interstitial lung disease
A O Harris-Eze1, G Sridhar, R E Clemens
1Division of Respiratory Medicine, University of Saskatchewan, Saskatoon, Canada.
American Journal of Respiratory and Critical Care Medicine
|December 1, 1995
Summary
Low-dose nebulized morphine did not improve exercise tolerance or reduce breathlessness in patients with interstitial lung disease (ILD). This study found no significant benefits for exercise performance or respiratory measures in ILD patients receiving morphine via nebulizer.
Area of Science:
- Pulmonary Medicine
- Respiratory Physiology
Background:
- Interstitial lung disease (ILD) is characterized by impaired exercise tolerance and dyspnea.
- Peripheral opioid receptors in the lungs have been hypothesized to mediate benefits from nebulized morphine.
Purpose of the Study:
- To investigate the effect of low-dose nebulized morphine on exercise performance, dyspnea, and breathing patterns in patients with ILD.
- To determine if nebulized morphine can improve exercise capacity in individuals suffering from ILD.
Main Methods:
- A double-blind, placebo-controlled study involving six ILD patients.
- Subjects underwent maximal incremental cycle ergometer tests after receiving nebulized saline, morphine 2.5 mg, or morphine 5.0 mg.
- Measurements included exercise duration, workload, dyspnea, oxygen uptake, ventilation, and other respiratory parameters.
Main Results:
- No significant differences were observed in exercise duration, maximal workload, or end-exercise dyspnea between morphine and saline treatments.
- Nebulized morphine did not alter resting, submaximal, or end-exercise measurements of VO2, VCO2, PETCO2, SaO2, VI, f, VT, or HR.
- The breathing pattern and the relationship between dyspnea and ventilation during exercise remained unchanged.
Conclusions:
- Low-dose nebulized morphine does not relieve dyspnea during exercise in ILD patients.
- Nebulized morphine administration does not enhance maximal exercise performance in individuals with ILD.
- No significant side effects were noted with the use of low-dose nebulized morphine.