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Published on: April 26, 2015
Prevention of reperfusion-induced ventricular arrhythmias in isolated rat heart with magnesium
1Laboratoire de pharmacodynamie, Faculté de pharmacie, Université de Dijon, France.
Abstract:
The effects of magnesium (from 1.2 to 7.2 mM) were investigated in isolated perfused rat heart subjected to coronary artery ligation and reperfusion. Increasing magnesium concentrations, of the medium containing 3.00 mM of calcium, induced a significant bradycardia and a protective effect towards reperfusion arrhythmias. A significant correlation was found between the heart rate and the antiarrhythmic activity of increasing magnesium concentrations. The effects of high magnesium concentration (4.8 mM) were also investigated after labelling of internal stores of noradrenaline with [3H]noradrenaline. Without any marked change in the pattern of release of radioactivity, a significant reduction of the sudden release of radioactivity was observed during the reperfusion. However, magnesium did not change the uptake of noradrenaline by the heart. Our results suggest that the antiarrhythmic effect of magnesium might be of importance in the clinical treatment of myocardial ischemia.
Insights
Magnesium supplementation reduced heart rate and arrhythmias in a rat model of heart attack. This study suggests magnesium
Area of Science:
- Cardiovascular Research
- Pharmacology
Background:
- Myocardial ischemia and reperfusion injury are significant clinical challenges.
- Reperfusion arrhythmias pose a serious threat to patients post-ischemia.
Purpose of the Study:
- To investigate the antiarrhythmic effects of magnesium during myocardial ischemia and reperfusion.
- To explore the correlation between magnesium concentration, heart rate, and arrhythmogenesis.
Main Methods:
- Isolated perfused rat heart model subjected to coronary artery ligation and reperfusion.
- Administration of varying magnesium concentrations (1.2–7.2 mM) in the perfusate.
- Assessment of heart rate, arrhythmias, and [3H]noradrenaline release patterns.
Main Results:
- Increasing magnesium concentrations induced significant bradycardia.
- Magnesium demonstrated a protective effect against reperfusion arrhythmias.
- A significant reduction in sudden noradrenaline release during reperfusion was observed with high magnesium levels.
- Magnesium did not alter noradrenaline uptake by the heart.
Conclusions:
- Magnesium exhibits significant antiarrhythmic properties in the context of myocardial ischemia-reperfusion.
- The findings support the potential clinical utility of magnesium in treating myocardial ischemia.
- Magnesium's protective effects may involve modulation of neurotransmitter release during reperfusion.
