Management of Atrioventricular Block

Introduction to AV Block Management

The American College of Cardiology recommends permanent pacemaker implantation as the gold standard treatment for Mobitz type II AV block regardless of symptoms, with a Class I recommendation due to high risk of progression to complete heart block 1, 2
Mobitz type I AV block typically requires pacing only when symptomatic or in specific high-risk situations, according to the American College of Cardiology 1, 2

Atropine 0.5 mg IV every 3-5 minutes (maximum 3 mg) may be attempted but is often ineffective for acute management of Mobitz type II AV block 3
Transcutaneous pacing is recommended for unstable patients if medical therapy fails, with expert consultation and transvenous temporary pacing may be necessary 3

Observation is generally appropriate for asymptomatic patients with Mobitz type I AV block, with regular monitoring using ECGs and Holter monitoring 1, 3
Permanent pacing is reasonable for symptomatic patients when symptoms are clearly attributable to the AV block, with a Class IIa recommendation 1, 2

Pacing is indicated for patients with Mobitz type I or II AV block associated with neuromuscular diseases or infiltrative cardiomyopathies, with consideration for additional defibrillator capability if meaningful survival >1 year is expected 1, 2
Post-cardiac surgery, pacemaker implantation is recommended for Mobitz II that persists beyond 7-10 days 4

Dual chamber pacing is recommended over single chamber ventricular pacing for patients with AV block, with a Class I recommendation, especially for those with preexisting heart failure 2
Diagnostic evaluation before pacing should include:
The American College of Cardiology recommends permanent pacemaker implantation for all patients with newly diagnosed Mobitz type II second-degree atrioventricular block, regardless of symptoms, due to high risk of progression to complete heart block and sudden death 1

After pacemaker implantation, a device check should be performed before discharge, and follow-up should occur within 2-12 weeks of implantation, with regular device checks as per standard protocol, typically every 6-12 months 1
Differentiation between true Mobitz II and 2:1 Wenckebach physiology is important, and exercise testing or electrophysiology study may be required in rare cases to determine the level of block 5, 1