A 44-year-old woman is having symptoms of muscle weakness and fatigue. On examination, her blood pressure is 120/80 mm Hg, pulse 80/min, JVP 4 cm, heart sounds normal, and lungs clear. Her serum potassium level is 2.5 mEq/L, bicarbonate 18 mEq/L, and anion gap is normal. The urine potassium is 40 mEq/L.For the above patient with hypokalemia, select the most likely diagnosis.
Correct Answer: RTA
Description: RTA types I and II cause hypokalemia with high potassium excretion (> 25 mmol/F) and a low bicarbonate in the absence of hypertension. Diabetic ketoacidosis can also result in this constellation of findings.
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