AV = atrioventricular

AV = atrioventricular

Arrhythmia Detection) first analyses the stability of the rhythm, then atrioventricular association, onset, and finally the chamber of origin (Figure 2.8) [21]. The chamber of origin is used to discriminate between ventricular tachyarrhythmias and atrial tachyarrhythmias with 1:1 AV relation by identification of atrial activity preceding ventricular activity or vice versa. In PARAD+, the additional criterion 'long cycle search' can be activated to inhibit therapy for atrial fibrillation with fast ventricular response.

The PR Logic algorithm (Figure 2.9) is based on the timing relationship of atrial activity with respect to ventricular activity. For atrioventricular relationship analysis, each RR interval is divided into four zones. Arrhythmia classification is based on PP and RR findings. An episode receives a code, which is compared with templates in a library of arrhythmias. PP intervals and

Figure 2.8. PARAD algorithm, as developed by ELA. AF: atrial fibrillation; AFl: atrial flutter; RR: RR intervals; ST: sinus tachycardia; SVT: supraventricular tachycardia; VT: ventricular tachycardia.

Dual-chamber Discrimination 15 5Q % of V-V interval

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