Pharma 30: Cardiac Arrhythmias - Restoring Rhythm Without Force

This episode explores antiarrhythmic therapy as an exercise in electrical diplomacy. Cardiac rhythm emerges from finely timed ion fluxes and conduction pathways; disturbance can arise from abnormal automaticity, triggered activity, or re-entry. Rather than memorising drug classes, we build a physiological map of impulse generation and propagation, then show how antiarrhythmics intervene—sometimes effectively, sometimes at a cost. The central lesson is humility: rhythm control is powerful, but never neutral.Key takeaways you’ll build and reuse throughout the series:* Rhythm as a circuit property: impulse initiation, conduction velocity, and refractoriness in balance.* Mechanistic classes revisited: sodium, potassium, calcium channel effects and beta-blockade as ways of reshaping timing.* Proarrhythmia as predictable risk: why drugs that stabilise rhythm can also destabilise it.* Rate versus rhythm control: different goals, different tolerances, different patient priorities.* Clinical reasoning: choosing when not to intervene electrically, and when anticoagulation matters more than rhythm. This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit drmanaankarray.substack.com/subscribe