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TEMPLATE BASED AV/VA INTERVAL COMPARISON FOR THE DISCRIMINATION OF CARDIAC ARRHYTHMIAS

  • US 20050256544A1
  • Filed: 05/12/2004
  • Published: 11/17/2005
  • Est. Priority Date: 05/12/2004
  • Status: Active Grant
First Claim
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1. A system for discriminating ventricular tachycardia (VT) from supraventricular tachycardia (SVT), the system comprising:

  • a sensing circuit to sense an atrial electrogram indicative of atrial depolarizations and a ventricular electrogram indicative of ventricular depolarizations;

    a rate detector circuit, coupled to the sensing circuit, to detect an atrial rate based on the atrial electrogram and a ventricular rate based on the ventricular electrogram;

    a tachycardia detector circuit, coupled to the rate detector circuit, to detect a tachycardia based on at least one of the atrial rate and the ventricular rate;

    a rhythm classifier circuit, coupled to the rate detector circuit and the tachycardia detector circuit, to classify the detected tachycardia as a 1;

    1 tachycardia when the atrial rate and the ventricular rate are substantially equal; and

    a tachycardia discriminator circuit coupled to the rhythm classifier circuit, the tachycardia discriminator circuit including;

    a time interval measurement circuit, coupled to the sensing circuit, to measure a tachycardia time interval between an atrial depolarization and an adjacent ventricular depolarization during the 1;

    1 tachycardia; and

    a VT comparator circuit coupled to the time interval measurement circuit, the VT comparator circuit having an output adapted to indicate a VT detection when the tachycardia time interval differs from a template time interval by at least a predetermined margin.

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