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Interaction between morphine and noradrenaline on isolated heart muscle
M I Valcarcel1, F Ruiz, M L Laorden
1Department of Physiology and Pharmacology, Murcia University School of Medicine, Spain.
General Pharmacology
|January 1, 1991
Summary
Morphine enhances the effect of noradrenaline on heart atrial contraction rate. This study shows morphine increases noradrenaline potency in isolated right atria.
Area of Science:
- Pharmacology
- Cardiovascular Physiology
Background:
- Noradrenaline is a key regulator of heart rate.
- Opioids like morphine can influence cardiovascular function.
Purpose of the Study:
- To investigate the interaction between morphine and noradrenaline.
- To determine the effect of morphine on noradrenaline's potency on atrial contractility.
Main Methods:
- Isolated right atria preparations were used.
- Concentration-response curves for noradrenaline were generated.
- The effect of morphine on noradrenaline's effective concentration 16 (EC16) was assessed.
Main Results:
- Noradrenaline significantly increased atrial contraction rate.
- The EC16 for noradrenaline was determined to be 85 +/- 0.8 x 10(-9) M.
- Morphine significantly decreased the EC16 of noradrenaline, indicating increased potency.
Conclusions:
- Morphine potentiates the chronotropic effects of noradrenaline on the isolated right atria.
- This interaction suggests a complex interplay between opioid and adrenergic systems in cardiac regulation.