Hypokalemia-Induced Seizures in the Elderly

Clinical Manifestations and Management

Hypokalemia can cause seizures in elderly patients, particularly when potassium levels fall below 3.0 mmol/L, presenting as generalized tonic-clonic seizures or other seizure types 1
Mild symptoms of hypokalemia include fatigue, muscle weakness, and emotional irritability, while moderate symptoms include abnormal involuntary movements 1
Severe symptoms of hypokalemia include seizures and cardiac arrhythmias, including prolongation of QT interval 1

The American Geriatrics Society recommends regular monitoring of electrolytes in high-risk patients, including those on thiazide or loop diuretics, with checks within 1-2 weeks of initiation, with each dose increase, and at least yearly 3
Medication use, particularly thiazide and loop diuretics, is a common cause of hypokalemia in the elderly 2
Careful medication selection and dosing in elderly patients, as well as consideration of hydrochlorothiazide over chlorthalidone when a thiazide diuretic is needed, can help prevent hypokalemia 2

The American College of Clinical Pharmacology recommends correction of the underlying electrolyte disturbance as the primary treatment for seizures caused by hypokalemia, rather than antiepileptic drugs 1
Potassium supplementation and magnesium supplementation if hypomagnesemia is present are recommended for the correction of hypokalemia 4