http://www.uptodate.com/patients/content/topic.do?topicKey=~IIOItricih9Qca/INTRODUCTION
— Seizures are not uncommon in patients undergoing hemodialysis [1]. Since they are more frequent in those who require acute dialysis for a severe uremic state, the current trend toward earlier initiation of dialysis has resulted in a lower incidence of seizures among these patients.
Seizure activity generally tends to occur during or shortly after the dialysis procedure because of the hemodynamic and biochemical changes associated with the process [1]. Preventive measures should therefore be initiated in patients with predisposing factors, such as extreme uremia or severe electrolyte abnormalities [2].
This topic will review the causes and treatment of seizures in dialysis patients. The management of seizures in patients without renal failure and a review of the acute complications which may occur during dialysis are presented separately. (See "Overview of the management of epilepsy in adults" and see "Acute complications during hemodialysis").
CAUSES
— Many of the causes of seizures are similar in those with and without renal failure. However, some are specifically related to patients with uremia:
Uremic encephalopathy
Dialysis disequilibrium syndrome
Drugs, such as erythropoietin, carbapenem and ertapenem
Hemodynamic instability, whether hypotension or hypertension
Cerebrovascular disease, such as hypertensive encephalopathy, infarction, hemorrhage, and subdural hematoma
Dialysis dementia due to aluminum intoxication
Electrolyte disorders, such as hypercalcemia, hypocalcemia, hypoglycemia, hyperglycemia, hyponatremia, and hypernatremia
Alcohol withdrawal (see "Management of moderate and severe alcohol withdrawal syndromes")
Air embolism (see "Air embolism")
These factors, either alone or in combination, may result in severe central nervous system dysfunction. In patients without renal failure, the presence of one such abnormality may be tolerated without seizure. However, since the threshold for seizure is lower among those with uremia and/or multiple electrolyte disorders, the addition of another central nervous system (CNS) insult, such as aggressive dialysis, may result in seizure activity.
This is an excerpt from a scholarly article. I couldn't access the entire article because one must subscribe to do so but it does address in a general way the issue of seizures in dialysis patients. There are so many things going awry in the bodies of ESRD patients that all sorts of weird things can occur. This is one of the major reasons that I do not think it wise to delay dialysis until the last gasp since irreversible damage can also occur if the body is ignored as it struggles to do what it was designed to do.