EP IBHRE EXAM PREP 2026 INVASIVE AND NON INVASIVE ELECTROPHYSIOLOGY PROCEDURES CORE CONCEPTS

EP IBHRE EXAM PREP 2026 INVASIVE AND
NON INVASIVE ELECTROPHYSIOLOGY
PROCEDURES CORE CONCEPTS

◉ AVNRT vs JT rates
Answer: AVNRT usually >140 bpm whereas <130 is usually JT


◉ Slow pathway / fast pathway Wenckebach (straight pacing) ERP's
needed for AVNRT
Answer: antegrade Wenckebach ERP of SP: <350 ms
retrograde Wenckebach ERP of FP: <400 ms


◉ LBBB vs RBBB
Answer: LBBB:
-V1 negative with opposite (+) T
-V6 broad and positive with opposite (-) T


RBBB:
-V1 broad (rabbit ear) rsr' with negative T
-V6 broad R with slurred S wave

, ◉ VA interval AVNRT vs AVRT
Answer: AVNRT VA interval is <70 ms


***BUT AVRT can show short VA if septal pathway


◉ His refractory PVC
Answer: During tach:
-used to determine if retrograde AP present and involved in tach
-see His deflection -> PVC paced
-because His deflection seen, PVC should not be able to make it back
to atrium unless retrograde conducting AP present
-if A advanced: AP present
-if A not advanced: DOES NOT RULE OUT AP (because site of AP
could be farther away from pacing site)
-if terminates tach: not only is AP present, but it is involved in tach
circuit


◉ ORT/ART/AVNRT termination
Answer: -ORT: blocks in node so usually ends in A
-ART: blocks in node so usually ends in V
-AVNRT: blocks in SP so usually ends in A (if ends in V, it could
signify damage to the FP)