Third-Degree Atrioventricular Block Differential Diagnoses

Updated: Dec 31, 2015
  • Author: Adam S Budzikowski, MD, PhD, FHRS; Chief Editor: Jeffrey N Rottman, MD  more...
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DDx

Diagnostic Considerations

Ischemia should always be in the differential for a patient with new-onset high-degree atrioventricular (AV) block. Take simple measures to rule out ischemia, such as 12-lead electrocardiography (ECG) and measurement of cardiac enzyme levels. If warranted, a more in-depth evaluation, including perfusion imaging, may be needed.

Iatrogenic heart block due to medications is not uncommon and should always be considered. Other problems to be considered include the following:

  • Bradycardia with a ventricular escape
  • Bradycardia with a junctional escape
  • Accelerated junctional escape rhythm

Differential Diagnoses