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Morphine does not affect laser induced warmth and pin prick pain thresholds
M van der Burght1, S E Rasmussen, L Arendt-Nielsen
1Department of Anesthesiology, University of Aarhus, Denmark.
Acta Anaesthesiologica Scandinavica
|February 1, 1994
Summary
This study found that intravenous morphine did not significantly alter warmth or pinprick pain thresholds induced by an argon laser in humans. Morphine is ineffective for intermittent pain, unlike continuous pain relief.
Area of Science:
- Pain Management
- Pharmacology
- Experimental Medicine
Background:
- Morphine is a potent opioid analgesic.
- Its efficacy in different pain types requires ongoing investigation.
- Experimental pain models offer controlled environments to study analgesic effects.
Purpose of the Study:
- To evaluate the analgesic effect of intravenous morphine on experimentally induced pain.
- To assess morphine's impact on warmth and pinprick pain thresholds.
- To compare morphine's effects against a placebo in human volunteers.
Main Methods:
- A double-blind, placebo-controlled study involving 30 healthy volunteers.
- Intravenous administration of morphine (0.15 mg/kg) or saline.
- Argon laser used to induce experimental pain; warmth and pinprick pain thresholds measured pre- and post-injection.
Main Results:
- Warmth thresholds increased by 20.7% in the morphine group and 14.3% in the placebo group (not statistically significant).
- Pinprick pain thresholds increased by 9.4% in the morphine group and 4.6% in the placebo group (not statistically significant).
- No statistically significant differences were observed between morphine and placebo groups for either threshold.
Conclusions:
- Intravenously administered morphine showed no significant effect on warmth or pinprick pain thresholds induced by an argon laser.
- Findings support the concept that morphine is less effective for intermittent pain compared to continuous pain.
- Further research may explore morphine's differential effects on various pain phenotypes.