Podcast 1016: Hypokalemia

Hypokalemia often stems from diuretic use, gastrointestinal losses, or temporary shifts caused by medications like albuterol. On an EKG, this condition manifests as U-waves or fused TU complexes that prolong cardiac repolarization, increasing the risk for life-threatening arrhythmias such as Torsades de Pointes and V-fib. While mild cases are treatable with oral potassium and magnesium, levels below 2.5 mEq/L require intravenous intervention. A rare but profound cause is hypokalemic periodic paralysis, a channelopathy predominantly affecting young males that results in sudden, temporary limb paralysis. For patients experiencing refractory V-fib due to electrolyte imbalances or myocardial ischemia, advanced interventions include Esmolol boluses, sequential double defibrillation using dual pad placement, or the initiation of ECMO to reoxygenate myocytes while preparing for definitive procedures like opening occluded vessels.