Bradydysrhythmias can be classified based the anatomic site of dysfunction and the ECG features.
Main categories based on the anatomic site of dysfunction:
(1) sinus node dysfunction
(2) arteriovenous (AV) block
Types of sinus node dysfunction:
(1) sinus bradycardia
(2) sinus arrest
(3) tachy-brady syndrome (sick sinus, sinoatrial disorder)
(4) chronotropic incompetence
Types of arteriovenous (AV) block:
(1) first-degree
(2) second-degree, Mobitz type I or Wenckebach
(3) second-degree, Mobitz type II
(4) third-degree (complete)
