Hypomagnesemia electrocardiogram

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

The EKG shows a prolonged QT interval.

Electrocardiogram

ECG changes are non-specific and include:

• A slight prolongation of conduction and the depression of the ST segment
• Magnesium depletion increases susceptibility to arrhythmogenic effects of drugs such as isoproterenol and cardiac glycosides and this includes:
• Supraventricular and ventricular arrhythmias
• Torsade de pointes, a repetitive polymorphous ventricular tachycardia with prolongation of QT interval, has been reported in cases of hypomagnesaemia,
• Torsade de pointes and other arrhythmias have been successfully treated with magnesium. However, this may be a pharmacological effect, independent of underlying magnesium deficiency.