Patient Characteristics
A total of 108 consecutive patients were enrolled with 27 in the
non-radiography group and 81 in the radiography group. All enrolled
patients underwent successful implantation of MicraTMpacemaker. Patient baseline characteristics and pacemaker indications
were summarized in Table 1. Of 108 patients, 48 (44.4%) had sinus node
dysfunction, 52 (48.1%) had II-III degrees of atrioventricular
conduction block, and 8 (7.4%) had both sinus node dysfunction and
atrioventricular conduction block. Overall, baseline LVEF and LVEDD were
normal in both groups. The baseline ECG QRS duration was 91.0±24.3 msin
the non-radiography group and 98.0±24.3 ms in the radiography group (P =
0.206).