Distal RTA (type 1) treatment includes which step?

• A. Give bicarbonate after correcting potassium deficit
• B. Bicarbonate should be given before correcting potassium
• C. Start ACE inhibitors
• D. Potassium-wasting diuretics

Answer: (A)

Distal RTA type 1 involves a defect in acid secretion in the distal nephron, causing a metabolic acidosis with often significant potassium loss. When treating this condition, raising the bicarbonate to correct the acidosis is important, but bicarbonate therapy can push potassium into cells and worsen a preexisting potassium deficit. Therefore the safer and more effective sequence is to first replenish and correct the potassium deficit, then begin bicarbonate therapy to address the acidosis. This minimizes the risk of severe hypokalemia during correction. Starting ACE inhibitors or using potassium-wasting diuretics would not help correct the underlying hypokalemia and would worsen it, respectively.