Your patient becomes restless and tells you she has a headache and feels nauseous during hemodialysis. Which complication do you suspect?: (A) Infection, (B) Disequilibrium syndrome, (C) Air embolism, (D) Acute hemolysis
Answer is B. Disequilibrium syndrome is caused by a rapid reduction in urea, sodium, and other solutes from the blood. 
This can lead to cerebral edema and increased intracranial pressure (ICP). Signs and symptoms include a headache, nausea, restlessness, vomiting, confusion, twitching, and seizures.