WorksheetsSA Node
Total questions: 10
Worksheet time: 3hrs 30mins
To evaluate SA node automaticity in the EP lab, physicians will perform
SNRT or CSNRT measurements
Atrial ERP or RRP measurements
AV conduction mapping
Atrial conduction mapping
An EP test indicative of severe sinus node dysfunction is
Atrial FRP > 200 msec
Atrial ERP < 200 msec
CSNRT > 525 msec
CSNRT < 525 msec
What EP technique is used to measure SNRT?
Overdrive suppression
Programmed stimulation
Parahisian pacing
Evaluating antegrade AV conduction
The technique to measure the SA node conduction time (SACT) uses
Isuprel to increase the sinus rate
A High RA extrastimuli to reset the sinus node
A 30 second Hi-RA pulse train, just faster than the sinus rate
The conduction time between Hi RA and Low RA electrodes
Which patient below has normal electrogram measurements in milliseconds?
AA 673, QRS 86, QT 401, AH 73, HV 48
AA 673, QRS 401, AH 48, HV 73
AA 673, QRS 105, QT 401, AH 130, HV 25
AA 673, QRS 86, QT 401, AH 73, HV 105
A patient's Sinus Node Recovery time was measured at 1175 msec, sinus cycle length 930 msec, QRS duration 86 msec, and HV of 52. What is the CSNRT?
(a)
The SNRT evaluates sinus node automaticity. CSNRT is "corrected" in an attempt to compare it to normal. What is the upper limit of normal for the CSNRT?
(a)
SACT measurement is used to evaluate a patient for
SA node exit block
Dual AV pathways
SA node automaticity
Retrograde SA node conduction
Sick Sinus Syndrome
The SACT (Sino Atrial Conduction Time) is calculated by the formula
(a)
SNRT and CSNRT should be measured at several cycle lengths. In the measurements below, what CSNRT should be reported?
CL - 600 ms
SNRT - 1100
CSNRT - 500
CL - 500
SNRT - 1010
CSNRT - 510
CL - 450
SNRT - 970
CSNRT - 520
CL - 400
SNRT - 930
CSNRT - 530
CL - 350
SNRT - 870
CSNRT - 520
