Hyperosmolarity and Potassium Movement in Diabetic Ketoacidosis

Pathophysiology of Hyperkalemia in DKA

DKA is characterized by insulin deficiency and elevated counterregulatory hormones, leading to hyperglycemia, ketosis, and acidosis, according to the American Diabetes Association 1
Despite significant total body potassium depletion through urinary losses, mild to moderate hyperkalemia is common in DKA patients at presentation, as reported by the American Diabetes Association 2

During DKA treatment, serum potassium levels typically fall as insulin therapy drives potassium back into cells, as recommended by the American Diabetes Association 2
Insulin therapy, correction of acidosis, and volume expansion all decrease serum potassium concentration, as stated by the American Association of Clinical Endocrinologists 2
To prevent hypokalemia during treatment, potassium replacement should be initiated after serum levels fall below 5.5 mEq/l, assuming adequate urine output, according to the American Diabetes Association 2