What are the iatrogenic causes of first-degree atrioventricular (AV) block?

Updated: Jan 06, 2020
  • Author: Jamshid Alaeddini, MD, FACC, FHRS; Chief Editor: Jose M Dizon, MD  more...
  • Print
Answer

First-degree AV block occurs in about 10% of patients who undergo adenosine stress testing and is usually hemodynamically insignificant. Patients with baseline first-degree AV block more often develop higher degrees of AV block during adenosine stress testing. These episodes, however, are generally well tolerated and do not require specific treatment or discontinuance of the adenosine infusion. [8]

Marked first-degree AV block may occur after catheter ablation of the fast AVN pathway with resultant conduction of the impulse via the slow pathway. This may result in symptoms similar to those of the pacemaker syndrome.

First-degree AV block (reversible or permanent) has been reported in about 2% of patients who undergo closure of an atrial septal defect using the Amplatzer septal occluder. [9] First-degree AV block can occur following cardiac surgery. Transient first-degree AV block may result from right heart catheterization.


Did this answer your question?
Additional feedback? (Optional)
Thank you for your feedback!