Findings related to potassium levels in a new study by the in the Journal of the American Medical Association challenge the current clinical guidelines. Monitoring potassium levels post MI (myocardial infarction AKA heart attack) is routine. Current guidelines recommend serum levels of 4.0 - 5.0 mEq/L. The study found better survival among those people whose level was 3.5 - 4.5 mEq/L. Will the guidelines change based on this study?