PVC – Localization, 2026 – Study guide and clinical
reference
Which aortic cusp is the most anterior? - correct answer ✔✔ RCC
Which aortic cusp is posterior and rightward - correct answer ✔✔ NCC
Which aortic cusp is posterior and leftward? - correct answer ✔✔ LCC
Where is the His relative to the RCC and the NCC? - correct answer ✔✔ Within
the membranous tissue between
Do outflow tract ventricular arrhythmias have an inferiorly or superiorly
directed QRS axis? - correct answer ✔✔ They are inferiorly directed, which is
reflected by positive forces in leads II and III.
If a lead 1 is negative, is the ventricular arrrhythmia origin more leftward or
rightward? - correct answer ✔✔ Leftward (bc the left arm limb lead is +)
How can aVR and aVL be used to determine ventricular arrhythmia origin? -
correct answer ✔✔ Comparison of relative amplitude of aVR and aVL
More + aVR = leftward origin
More + aVL = rightward origin
Where is the precordial transition in RBBB? - correct answer ✔✔ First lead
with a predominant S wave
