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Published on 01.05.2021
His refractory atrial extrastimulus can help for differential diagnosis between atrioventricular nodal reentrant tachycardia and junctional tachycardia.
Baseline intervals (ms) | |
Sinus cycle length (SCL) | 520 |
AH interval (AH) | 72 |
HV interval (HV) | 44 |
QRS duration (QRS) | 80 |
Decremental ventricular pacing (DVP) (ms) | |
VABCL | 280 |
Ventricular extrastimulus pacing (VEP) (ms) | |
AVN retrograde ERP | 500/350 |
VA decremental and concentric conduction | Yes |
Decremental atrial pacing (DAP) (ms) | |
AVBCL | 380 |
Atrial extrastimulus pacing (AEP) (ms) | |
AH jump/echo | Yes |
Dual AVN response | No |
SVT after AH jump | Yes |
SVT cycle length | 360 |
VA interval during SVT | 5 |
SVT response to VAV | PPI-TCL>115ms |
SVT response to atrial overdrive pacing | SVT termination |
SVT response to autonomic His refractory PACs | SVT resetting |
AVBCL, atrioventricular block cycle length; VABCL, ventriculoatrial block cycle length; AH, atrio-His interval; HV, His-ventricular interval; PPI, post-pacing interval; TCL, tachycardia cycle length. |
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