Hyperkalemia Explained: Pathophysiology of Sine Waves

This video explores the progression of hyperkalemia from T-wave abnormalities to the sine wave pattern seen in severe cases. It explains how elevated extracellular potassium alters the resting membrane potential, leading to disruptions in sodium channel function and conduction velocity. The video reviews the effects on myocardial action potential, including Phase 0 prolongation, QRS widening, and the merging of depolarization and repolarization phases. It concludes by highlighting the disproportionate impact on the His-Purkinje system and the eventual risk of cardiac arrest. Timestamps: 0:00 - Introduction and overview of hyperkalemia progression 0:22 - Hyperkalemia definition and potassium dynamics 1:50 - Changes in resting membrane potential 2:30 - Disruption of sodium channels and Phase 0 prolongation 4:00 - Widening of QRS complex and conduction slowing 6:40 - Impact on His-Purkinje system and QRS-T merging 8:30 - Sine wave formation and cardiac arrest risk