Opioid modulation of oxytocin release
Mark S Morris1, Edward F Domino, Steven E Domino
1Department of Pharmacology, University of Michigan, Ann Arbor, MI 48109-5617, USA.
Journal of Clinical Pharmacology
|March 31, 2010
Summary
Opioid analgesics, like morphine, are used for labor pain. This review explores how morphine affects oxytocin release, explaining its role in early labor and sedation.
Area of Science:
- Obstetrics and Gynecology
- Pharmacology
- Neuroendocrinology
Background:
- Labor analgesia commonly involves opioid medications, with a variety of agents available.
- The use of morphine and other opioids in labor has declined due to factors like epidural availability and neonatal safety concerns.
- Morphine is now mainly utilized for sedation and rest during the prodromal stages of labor.
Purpose of the Study:
- To review the scientific basis of opioid effects on oxytocin release.
- To explain the clinical implications of morphine's impact on prodromal labor.
Main Methods:
- Literature review of studies on opioid analgesics in labor.
- Analysis of the relationship between opioid administration and oxytocin modulation.
- Correlation of pharmacological data with clinical observations in obstetrics.
Main Results:
- Opioids, particularly morphine, can modulate oxytocin release from the posterior pituitary.
- This modulation helps explain morphine's observed effects on early labor progression and patient sedation.
- Understanding this mechanism clarifies the historical and current use of morphine in obstetrics.
Conclusions:
- Opioid modulation of oxytocin is a key factor in understanding morphine's role in labor.
- Morphine's utility in prodromal labor is linked to its neuroendocrine effects.
- Further research can refine the use of opioids in labor analgesia and management.
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