Seizures in Elderly Patients: Metabolic and Toxic Causes

Electrolyte Abnormalities and Glucose Dysregulation

Hyponatremia, hypocalcemia, and hypomagnesemia are critical treatable causes of seizures that must be identified immediately, as they can trigger seizures at any age, even without prior seizure history, particularly in patients with parathyroid dysfunction 1, 2, 3
Hypoglycemia must be excluded immediately with point-of-care testing in any seizure patient, as it is a recognized cause of seizures in elderly diabetic patients 4

Renal failure and uremia can precipitate seizures, particularly common given the high prevalence of chronic kidney disease in the elderly, and certain medications like tramadol and antipsychotic agents can lower seizure threshold 1, 2
The American College of Cardiology recommends considering the potential for drug interactions and toxicity, particularly with anticholinergic medications, sedatives, and multiple cardiovascular drugs, when managing seizures in elderly patients 5

Immediate point-of-care glucose testing is mandatory, and a comprehensive metabolic panel including sodium, calcium, magnesium, and renal function should be performed to systematically exclude reversible causes before attributing seizures to structural disease 1, 4
For provoked seizures due to metabolic causes, the American College of Cardiology recommends correcting the underlying abnormality rather than initiating long-term antiseizure medications, and temporary seizure control with short-acting benzodiazepines may be necessary if seizures are active and not self-limiting within 5 minutes 1, 5