Patient - EN
Same patient as in tracing 1.
Graph and trace
Tracing 4a: programming in AAI mode 50 beats/minute;
- permanent atrial sensing and inhibition of atrial pacing;
Tracing 4b: programming in AAI mode 60 beats/minute;
- permanent atrial pacing with preserved atrioventricular conduction but relatively long PR interval.
NID old - EN
3444
A single-chamber pacemaker operates in AAI mode when a single lead is positioned in the atrium; the AAI mode can also be programmed in a dual-chamber pacemaker. This tracing allows highlighting the main characteristics of this pacing mode:
A recent study has reported unfavorable results in the implantation of a single-chamber AAI pacemaker compared to the implantation of a dual-chamber pacemaker in patients with sinus dysfunction. Indeed, the rate of re-intervention is greater in patients implanted with an AAI with the need to add a ventricular lead as a result of the occurrence of an atrioventricular conduction disorder. Hence, the indications for the implantation of a single-chamber AAI pacemaker are nowadays relatively limited.
In this patient, the prolonged post-atrial pacing PR interval is not propitious to the programming of AAI pacing in the long term.