Acid–Base And Electrolyte Disorders Practice Test

A 67-year-old man with end-stage renal disease who missed his last two hemodialysis sessions presents with generalized weakness and palpitations. His ECG shows peaked T waves, a PR interval of 240 ms, and a QRS duration of 140 ms. His serum potassium is 7.5 mEq/L.

A 75-year-old woman with heart failure (ejection fraction 35%), type 2 diabetes, and stage 3 chronic kidney disease is evaluated in clinic. Her medications include lisinopril, metformin, and furosemide. Two weeks ago, she was started on spironolactone. Today, she complains of new-onset weakness. A fingerstick glucose is 140 mg/dL. Her serum potassium is 6.2 mEq/L.