Magnesium sulfate may be effective in terminating re-fractory ventricular tachyarrhythmias, particularly poly-morphic ventricular tachycardia. Digitalis-induced ar-rhythmias are more likely in the presence of magnesium deficiency. Magnesium sulfate can be administered orally, intramuscularly, or, preferably, intravenously, when a rapid response is intended. The loss of deep ten-don reflexes is a sign of overdose.
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