Which AVRT pathway is most commonly observed?

Which AVRT pathway is most commonly observed?

• A. Right lateral pathways
• B. Septal pathways
• C. Left lateral pathways
• D. Posterior wall

Answer: (C)

AVRT relies on an accessory pathway that forms a reentrant circuit between the atrium and ventricle. The most commonly observed tract is located on the left lateral wall near the mitral annulus. This left-sided pathway is the predominant substrate in patients with AVRT/WPW and is encountered more often than pathways on the right, posterior/septal, or other locations. Because this site is the most common, clinicians often map to the left lateral region when evaluating or ablating AVRT, and it tends to conduct retrogradely to sustain the tachycardia. The other sites can occur but are less frequent.

AVRT relies on an accessory pathway that forms a reentrant circuit between the atrium and ventricle. The most commonly observed tract is located on the left lateral wall near the mitral annulus. This left-sided pathway is the predominant substrate in patients with AVRT/WPW and is encountered more often than pathways on the right, posterior/septal, or other locations. Because this site is the most common, clinicians often map to the left lateral region when evaluating or ablating AVRT, and it tends to conduct retrogradely to sustain the tachycardia. The other sites can occur but are less frequent.