What is the suggested daily amount of potassium for maintenance in an infant receiving parenteral nutrition?

• A. 0.8-1 mEq/kg
• B. 2-4 mEq/kg
• C. 5-6 mEq/kg
• D. 7-8 mEq/kg

Answer: (B)

Potassium is a key intracellular ion essential for cellular function, nerve conduction, and muscle activity. In infants receiving parenteral nutrition, maintaining an appropriate potassium supply per kilogram of body weight is crucial due to their growth needs and immature renal function. The recommended maintenance range of about 2-4 mEq/kg per day provides enough potassium to prevent depletion and support metabolic and developmental needs without tipping into excess that could cause hyperkalemia in this age group. Giving less than this increases risk of hypokalemia with weakness and potential cardiac issues, while giving substantially more raises the danger of dangerous potassium elevations in infants with limited ability to excrete it. This balance explains why 2-4 mEq/kg/day is the best-fit maintenance range.