Triggered modes
Tracing
Manufacturer Medtronic
Device PM
Field Pacing Modes
N° 3
Patient
Same patient as in tracing 1.
Graph and trace
Tracing 3a: programming in AAT mode 40 beats/minute;
- proper sensing of spontaneous atrial activity triggering an atrial pacing (TP for Triggered Pacing);
- correct sensing of the atrial extrasystole triggering an atrial pacing (TP);
Tracing 3b: programming in AAT mode 60 beats/minute;
- atrial pacing at the base rate (AP);
- proper sensing of the atrial extrasystole triggering an atrial pacing (TP);
Tracing 3c: programming in VVT mode 40 beats/minute;
- proper sensing of spontaneous ventricular activity and ventricular pacing (TP); absence of capture and electrocardiographic pattern similar to that of a spontaneous pattern;
- non-conducted atrial extrasystole with compensatory rest; at the end of the escape interval (1500 ms after ventricular sensing), ventricular pacing at the base rate (VP);
- fusion between the spontaneous ventricle and the paced ventricle.
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EGM recordings
EGM recordings
When the VVT mode is programmed, pacing occurs at the programmed minimum rate, although a sensed non-refractory event triggers an immediate pacing in the absolute refractory period of the ventricular myocardium. This operational mode therefore corresponds to the opposite of the VVI mode where sensing inhibits pacing. This type of pacing mode is very seldom programmed today. Indeed, pacing during sensing is associated with an unnecessary increase in energy consumption with acceleration of battery wear. The triggered modes can be used in 2 special circumstances: