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Control of breathing during methadone addiction
The American Journal of Medicine
|March 1, 1977
Summary
Methadone maintenance therapy can impair breathing control, especially early on. Tolerance develops over time, improving breathing responses to carbon dioxide but not fully to hypoxia.
Area of Science:
- Pharmacology
- Respiratory Physiology
- Neuroscience
Background:
- Methadone maintenance is a key treatment for opioid use disorder.
- Understanding methadone's effects on respiratory control is crucial for patient safety.
Purpose of the Study:
- To investigate the impact of methadone maintenance on the chemical control of breathing.
- To differentiate effects based on duration of methadone use.
Main Methods:
- Studied 14 former heroin addicts in a methadone maintenance program.
- Measured breathing responses before and after daily methadone doses.
- Grouped subjects by duration of methadone use (short-term <2 months vs. long-term >8 months).
Main Results:
- Short-term users showed higher carbon dioxide levels and lower hypoxic ventilatory response before methadone.
- After methadone, short-term users had reduced ventilation, lower oxygen, higher carbon dioxide, and blunted responses to CO2 and hypoxia.
- Long-term users showed only a reduced hypoxic ventilatory response after methadone.
Conclusions:
- Early methadone use (<2 months) causes alveolar hypoventilation by depressing central and peripheral chemoreception.
- Tolerance to methadone's effect on CO2 chemoreception develops by 5 months.
- Tolerance to hypoxia chemoreception develops more slowly and incompletely.