Table 2

Five Prospectively Identified Diagnostic Pacing Maneuvers and Questions Askedlegend

Pacing ManeuverQuestions Asked
1. Pace the atrium during SVT at a CL 10–40 ms < SVT CL• Is VA interval with return beat the same as during SVT?
2. Pace the atrium during SVT at AV Block CL• Is SVT termination dependent on last AH interval?
3. Pace the ventricle during SVT at a CL 10–40 ms < SVT CL• Can the atrial rate be accelerated to the ventricular pacing rate?
• If the atrial rate cannot be accelerated to the ventricular pacing rate, is it because the SVT always terminates or because the VA block CL during SVT > SVT CL?
• If the atrial rate can be accelerated to ventricular pacing rate, is the response upon cessation of pacing “A-A-V” or “A-V”?
• If the atrial rate can be accelerated to ventricular pacing rate, is the atrial activation the same as during SVT?
4. Pace ventricle during SVT at a CL 200–250 ms for 3–6 beats• Can SVT be terminated by burst ventricular pacing without depolarization of the atrium?
5. Scan diastole with a premature ventricular stimulus• Can SVT be terminated with a ventricular extrastimulus during His-bundle refractoriness?
• Can SVT be terminated with a ventricular extrastimulus without affecting the atrium?
  • legend A-A-V = atrial-atrial-ventricular; A-V = atrial-ventricular; AV = atrioventricular; CL = cycle length; SVT = supraventricular tachycardia; VA = ventriculoatrial.