Supraventricular Tachycardia‐Ventricular Tachycardia Discrimination Algorithms in Implantable Cardioverter Defibrillators: State‐of‐the‐Art Review
- 1 May 2001
- journal article
- review article
- Published by Wiley in Journal of Cardiovascular Electrophysiology
- Vol. 12 (5) , 606-612
- https://doi.org/10.1046/j.1540-8167.2001.00606.x
Abstract
SVT‐VT Discrimination Algorithms in ICDs. To reduce inappropriate therapy of supraventricular tachycardia (SVT), implantable cardioverter defibrillators (ICDs) include algorithms to discriminate ventricular tachycardia (VT) from SVT. Dual‐chamber algorithms analyze atrial and ventricular rates or AV relationship. They provide advantages over single‐chamber algorithms, but introduce new ways to detect SVT as VT inappropriately and to underdetect VT. Unlike pacemakers, dual‐chamber ICDs require accurate atrial sensing during high ventricular rates. A postventricular atrial blanking period prevents oversensing of far‐field R waves as atrial electrograms, but causes underdetection of atrial fibrillation during high ventricular rates. Tachycardias with 1:1 AV relationship and VT during atrial tachyarrhythmias present specific SVT‐VT discrimination problems. The first dual‐chamber algorithms performed comparably to single‐chamber algorithms. Present dual‐chamber algorithms correct some limitations of earlier versions.Keywords
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