Device Characteristics
During implantation of all LPs and the follow-up period, there was no evidence of major adverse cardiovascular events or other device related complications.
Indications for device placement are included in Table 1, with the most common indication being complete AV block (38%). Patients were either implanted with a Medtronic Micra AV (44%) or Micra VR device (56%). The septal location, as determined from chest x-ray, with the highest number of implantations was the apical septum with 27 (56%), followed by the mid septum with 15 (31%) and the high septum with 6 (13%) (Figure 1). Using posterior-anterior and lateral chest x-ray projections, a device was labeled apical if located in the anterior 1/3rd, mid if located in the middle 1/3rd, and high if located in the basal 1/3rd of the septum. The devices were most commonly programmed to the VVIR mode (Figure 3). VDD pacing mode consisted of 27% while VVI/VVIR consisted of 71% of patients. The average pacing burden was 82.89% (STD 22.33), ranging from 22.6% to 100%.