EP IBHRE ELECTROPHYSIOLOGY STUDY
GUIDE 2026 CARDIAC RHYTHM
MECHANISMS AND ELECTRICAL
SIGNALING REVIEW
◉ normal HV interval
Answer: 35-55 ms
◉ Normal atrial ERP
Answer: 180-330 ms
◉ Normal AVNERP
Answer: 250-400 ms
◉ Normal VERP
Answer: 180-290 ms
◉ AH measures
Answer: AVN conduction time
, ◉ Curve with AP
Answer: Should see a straight line with decreased A1-A2 CL's (no
decrement) then a "jump" to the AVN conduction
◉ % of people with retrograde conduction
Answer: 75%
◉ SNRT
Answer: Measurement of the SA node automaticity
◉ CSNRT
Answer: SNRT-BCL
◉ When does CSNRT suggest SAN dysfunction
Answer: CSNRT >525 ms
◉ Method for obtaining SNRT
Answer: Electrode near SAN is paced -> Overdrive suppression
pacing for at least 30 seconds -> measure the degree of SAN
suppression
◉ SACT
GUIDE 2026 CARDIAC RHYTHM
MECHANISMS AND ELECTRICAL
SIGNALING REVIEW
◉ normal HV interval
Answer: 35-55 ms
◉ Normal atrial ERP
Answer: 180-330 ms
◉ Normal AVNERP
Answer: 250-400 ms
◉ Normal VERP
Answer: 180-290 ms
◉ AH measures
Answer: AVN conduction time
, ◉ Curve with AP
Answer: Should see a straight line with decreased A1-A2 CL's (no
decrement) then a "jump" to the AVN conduction
◉ % of people with retrograde conduction
Answer: 75%
◉ SNRT
Answer: Measurement of the SA node automaticity
◉ CSNRT
Answer: SNRT-BCL
◉ When does CSNRT suggest SAN dysfunction
Answer: CSNRT >525 ms
◉ Method for obtaining SNRT
Answer: Electrode near SAN is paced -> Overdrive suppression
pacing for at least 30 seconds -> measure the degree of SAN
suppression
◉ SACT