Search for: [Abstract = "echo parameters were studied prior to the implantation procedure. During the implantation procedure of the VDD\/R pacemaker the amplitude \(assumed minimum Aav > 1 mV\) and stability of atrial potential detection were estimated in relation to breathing condition. The position of the atrial dipole was also determined. Atrial potential parameters were monitored \(Aav, Amin, detection threshold\) in relation to respiration manoeuvers and body position, over a 12\-month follow\-up. Follow\-up was carried out 3\-4 days and 1, 3, 6 and 12 months after the procedure. The effectivenes of AV synchronization \(PAS\) was estimated by event counter read\-out, treadmill exercise and ECG Holter monitoring. RESULTS\: The variability of Aav in relation to breathing condition during the procedure was insignificant, except for the Valsalva manoeuvre. In the majority of cases the atrial dipole was localized in the upper part of the right atrium, as shown by optimally stable detection of the A wave potential. The differences in the value of the potential amplitude during respiratory manoeuvres with respect to normal breathing or according to body position were generally statistically insignificant during the whole observation period. Over the 12\-month follow\-up, the average value of the PAS coefficient was ca. 95% for the entire group of patients. In 74% \(group A\) synchronization was highly effective \(PAS >"]

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