Europace Advance Access originally published online on May 2, 2009
Europace 2009 11(6):727-733; doi:10.1093/europace/eup099
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ICD
Morphology discrimination criterion wavelet improves rhythm discrimination in single-chamber implantable cardioverter-defibrillators: Spanish Register of morphology discrimination criterion wavelet (REMEDIO)
Hospital Puerta de Hierro, Madrid, Spain
Aims: Implantable cardioverter defibrillators (ICDs) are increasingly being used for treatment of ventricular tachycardia (VT)/fibrillation. Inappropriate therapy delivery remains the most frequent complication in patients with ICDs, resulting in psychological distress, proarrhythmia, and battery life reduction. We aim to determine if inappropriate therapies could be reduced by using a morphology discrimination criterion.
Methods and results: We evaluated the performance of the WaveletTM morphology discrimination algorithm (Medtronic, Inc.) independently from other discrimination enhancements (rate onset and interval stability). A non-randomized, prospective, multicenter, and observational study was designed to determine the sensitivity and specificity of the new morphology criterion. Sensitivity and specificity in slow tachycardia with cycle length (CL) between 340 and 500 ms were analysed as a pre-specified secondary endpoint. A total of 771 spontaneous episodes in 106 patients were analysed. Five hundred and twenty-two episodes corresponded to true supraventricular tachycardia (SVT) with ventricular CL in the VT or FVT zone, of which 473 had therapy appropriately withheld. Of the 249 episodes of true VT/FVT, 21 were classified according to the WaveletTM criteria as SVT (specificity: 90.6%; sensitivity: 91.6%). All of them were spontaneously terminated with no adverse clinical consequences. No syncopal episodes occurred. For VTs in the slowest analysed range (CL: 340–500 ms), a total of 235 episodes were studied, yielding a specificity of 95.9% and sensitivity of 83.2%.
Conclusion: WaveletTM discrimination criteria in single-chamber ICDs as the sole discriminator can significantly reduce inappropriate therapy for SVT, not only in the range of VTs in the slowest analysed range (340–500 ms for this study) but also for faster VTs. No significant clinical consequences were found when the algorithm was used, but final data should prompt the use of the algorithm in combination with a high rate time-out feature.
Key Words: Ventricular tachycardia, Morphology discrimination criteria, Inappropriate therapy, ICD
* Corresponding author. Tel: +34 63 091 6248, Fax:+34 91 373 7091, Email: jorgetoquero{at}secardiologia.es
Manuscript submitted 24 October 2008. Accepted after revision 4 April 2009.