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.

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