Abstract
In a prospective study on digitalis intoxication, low serum magnesium was found in 90 patients, while 388 patients had values above 1.5 mEq/l. Hypomagnesemia was more frequent in women than in men, in those with low body weight and in those with advanced heart failure. More patients with hypomagnesemia than those without had nausea, anorexia, fatigue, flickering of vision and atrial tachycardia with block. Patients with hypomagnesemia also had lower serum potassium than normomagnesemic patients. There was, however, no significant difference in the prevalence of digitalis intoxication or in serum digitoxin concentration. Nor was there any correlation between serum digitoxin and serum magnesium levels.
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