All of the following results in central nervous system manifestation in chronic renal failure, EXCEPT:

Hypocalcemia can occur in chronic renal failure patients. But CNS manifestation of hypocalcemia in uremic patients are relatively rare because parathyroid hormone levels are elevated and the calcium concentration in the brain is high. Rarely signs of peripheral nerve hyperexcitability occur in these patients because hypocalcemia develop insidiously and peripheral nerve calcium concentration remain relatively high. Ref: Replacement of Renal Function By Dialysis By Claude Jacobs, 4th Edition, Page 1246