06-18-2005, 06:54 AM
A 55-year-old man being treated for congestive heart failure becomes confused about his medications and takes an overdose of digoxin. Five hours later, he reports anorexia, nausea, vomiting, and visual disturbances. Serum digoxin concentration is 10 ng/mL (toxic > 2.5 ng/mL); serum potassium concentration is 7.2 mEq/L. Which of the following is the most likely cause of the hyperkalemia?
A
) Hyporeninemic hypoaldosteronism
B
) Increased renal tubular absorption of potassium
C
) Inhibition of Na+-K+ ATPase
D
) Intravascular hemolysis
E
) Rhabdomyolysis
A
) Hyporeninemic hypoaldosteronism
B
) Increased renal tubular absorption of potassium
C
) Inhibition of Na+-K+ ATPase
D
) Intravascular hemolysis
E
) Rhabdomyolysis