In a hospitalized patient with DKA, how should potassium be managed relative to insulin therapy?

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Potassium balance in DKA hinges on a rapid shift of potassium between compartments when insulin is given and acid–base status is corrected. Although the patient may have a normal or even high serum potassium early on, total body potassium is usually depleted from urinary losses during the hyperglycemic state. When you start insulin therapy, potassium moves from the bloodstream into cells, which can plunge serum potassium levels quickly and dangerously if you aren’t replenishing it.

That’s why starting insulin promptly and providing potassium replacement concurrently is the safer, more effective approach in this setting. Insulin addresses the hyperglycemia and acidosis, while potassium supplementation guards against hypokalemia as the intracellular shift occurs. The patient’s serum potassium should then be monitored closely and the potassium dose adjusted based on serial measurements to keep levels in a safe range.