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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.
Abstract:
1. We evaluated the interaction between morphine and noradrenaline on the right atria. 2. Noradrenaline significantly increased atrial contraction rate, with an effective concentration 16 (EC16) of 85 +/- 0.8 x 10(-9) M. 3. The EC16 of noradrenaline significantly decreased in the presence of morphine. 4. These results demonstrate that morphine increases the potency of noradrenaline on the isolated right atria.
Insights
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.