263 Ch 262. Bradyarrhythmias and Pacing

Sinus node + AV node + His-Purkinje system; sinus bradycardia (often physiologic) vs sick sinus syndrome vs AV blocks (1°, 2° Mobitz I/II, 3° complete); pacemaker indications: symptomatic bradycardia, advanced AV block, post-MI / post-cardiac surgery; 2024 leadless pacemakers (Micra, Aveir) + conduction system pacing (His bundle, LBB area) revolutionizing。