Pacemaker: Principles

1st class indications: Sinus node dysfunction, AV blocks, chronic bifascicular blocks, after acute phase of MI, after cardiac transplantation & pacing to prevent tachycardia) 1- Indications for single chamber pacemakers - permanent A. fib (VVI: a.fib w/ bradycardia, AAI: sinus bradycardia, sinus arrest) 2- Indications for dual chamber pacemakers - Sick sinus syndrome caused by sinus node dysfunction, AV blocks