The usefulness of 24 hour Holter monitoring in asymptomatic pacemaker patients in early post-implantation period

Background : Twenty four hour Holter monitoring (HM) in an early post-implantation period in asymptomatic patients is considered as class IIb according to the ACC/AHA guidelines. It seems that post-implantation assessment extended by 24 hour HM in these patients might shorten hospitalization and increase safety of these patients. This aspect has not been widely discussed so far. The aim of our study was to evaluate pacing and sensing disturbances in asymptomatic patients with proper parameters of single and double chamber pacemakers. Methods : Studied group included 236 patients implanted with Biotronik Actros S (single chamber) (group I - 130 patients) and Biotronik Actros D or Axios D (group II - 106 patients) pacemakers. In all the patients 24 hour HM was performed 1-6 days after implantation (mean 3.4) in order to assess all pacing and sensing disturbances. Results : Sensing disturbances were found in 2 patients from group I and 22 patients from group II (the most frequent pacemaker failure was atrial undersensing followed by ventricular oversensing-T wave stering). In 1 patient from group I atrial failure to pace was observed. In whole group pacing/sensing disturbances were found in 23% of patients, nevertheless they did not provoke any hemodynamic consequences. Conclusions : In an early post-implantation period pacemaker disturbances occur in 23% of asymptomatic patients being more frequent in patients with dual chamber pacemaker. Atrial undersensing and ventricular oversensing are the most common disturbances, nevertheless having no hemodynamic consequences they are not life-threatening. Detection of these episodes in an early post-implantation period allows for early change in pacemakers’ parameters and thus decreasing risk of rehospitalization. We confirmed the low usefulness of HM in patients with single chamber pacemaker early after implantation.