Patients with blood potassium levels between 3.5 and 4.5 milliEquivalents per liter were less likely to die than those with higher or lower levels following an acute myocardial infarction, a study in the Journal of the American Medical Association found. The study challenges the current guidelines that recommend serum potassium levels between 4.0 and 5.0 mEq/L for post-AMI patients.

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