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Differences in ventricular tachyarrythmias and antitachycardia pacing effectiveness according to the ICD indication (primary versus secondary prevention): an analysis based on the stored electrograms

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Journal of Interventional Cardiac Electrophysiology Aims and scope Submit manuscript

Abstract

Purpose

To determine whether monomorphic ventricular tachycardias (VTs) have different characteristics and/or responses to antitachycardia pacing (ATP) with respect to the indication—primary prevention (PP) versus secondary prevention (SP)—among ICD patients with left ventricular dysfunction.

Methods

We prospectively studied 551 VT (cycle length [CL] 329 ± 35 ms; PP 34 %) occurring in 67 ICD patients with left ventricular dysfunction (LVEF 35 ± 8 %). ICD programming was standardized, including ATP for slow (CL 400–321 ms) and fast VT (CL 250–320 ms). We analyzed the following aspects: CL, percentage of variability of the 12 RR intervals prior to ATP (P-RR)—which was calculated by dividing the mean difference between each R-R interval with the next one by the CL × 100—and type of termination: immediate (VT ceased immediately upon ATP completion) or delayed (VT persisted after ATP).

Results

ATP was successful in 86 % of VTs. VTs occurring in SP patients had a lower P-RR, median (IQR) 2.7 % (1.2–3.7) versus 1.9 % (0.9–3.2); p = 0.002; they terminated immediately after ATP less frequently (27 % versus 12 %; p < 0.001), and although they were more frequently slow (51 % versus 67 %; p = 0.01), ATP was less effective in them, 92 versus 80 % (p = 0.02).

Conclusions

VTs occurring in SP patients are slower, more stable, and they terminate less frequently at ATP. Therefore, compared with PP, SP patients seem to have fewer self-terminating VTs.

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Abbreviations

ICD:

implantable cardioverter-defibrillator

PP:

primary prevention

SP:

secondary prevention

VT:

monomorphic ventricular tachycardia

ATP:

antitachycardia pacing

LVEF:

left ventricular ejection fraction

CL:

cycle length

P-RR:

percentage of variation of R-R intervals

Mn-RR:

mean difference between each R-R interval with the next one

NSVT:

non-sustained ventricular tachyarrhythmia

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The authors declare that they have no conflict of interest.

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Correspondence to Javier Jiménez-Candil.

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Jiménez-Candil, J., Hernández, J., Martín, A. et al. Differences in ventricular tachyarrythmias and antitachycardia pacing effectiveness according to the ICD indication (primary versus secondary prevention): an analysis based on the stored electrograms. J Interv Card Electrophysiol 44, 187–195 (2015). https://doi.org/10.1007/s10840-015-0050-0

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  • DOI: https://doi.org/10.1007/s10840-015-0050-0

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