Thyrotoxic Periodic Paralysis

This episode examines thyrotoxic periodic paralysis, a dangerous but reversible complication of hyperthyroidism characterized by acute muscle weakness and hypokalemia. We break down the underlying three-hit pathophysiology, where excess thyroid hormone upregulates the sodium-potassium pump, genetic mutations impair outward potassium channels, and an environmental trigger like insulin or epinephrine induces a massive intracellular potassium shift. Finally, we review acute management using nonselective beta-blockers and definitive therapies to restore euthyroidism.