Table 2: Procedural and pacing characteristics All patients (n=44) SDL group (n=20) LLL group (n=24) p-value*
Procedural characteristics
Screw attempts, n 2 ±0.9 2 ±0.8 2 ±1.0 0.864
Implant depth, mm 13 ±1.4 13 ±1.0 13 ±1.7 0.472
Total fluoroscopy time, min 11 ±6.5 9 ±3.5 13 ±7.5 0.188
Procedural time, min 65 ±23.7 61 ±15.9 69 ±27.5 0.500
Paced ECG characteristics
Paced QRS duration, ms 130 ±22.2 127 ±20.3 131 ±23.6 0.570
Stimulus to LVAT, ms 72 ±12.8 73 ±15.2 71 ±11.2 0.703
Pacing characteristics at implant
Unipolar threshold, V 0.5 ±0.17 0.5 ±0.15 0.4 ±0.17 0.251
Bipolar threshold, V 0.5 ±0.26 0.6 ±0.09 0.5 ±0.31 0.466
Unipolar R-wave sensing, mV 13 ±7.1 12 ±9.5 15 ±4.8 0.686
Bipolar R-wave sensing, mV 13 ±6.1 13 ±6.2 13 ±6.2 0.799
Unipolar impedance, ohms 414 ±57.3 388 ±47.6 431 ±58.0 0.073
Bipolar impedance, ohms 592 ±68.3 557 ±87.0 617 ±39.5 0.060
Pacing characteristics at 1 month
Unipolar threshold, V 0.6 ±0.33 0.7 ±0.22 0.6 ±0.37 0.391
Bipolar threshold, V 0.7 ±0.31 1.0 ±0.40 0.7 ±0.26 0.172
Bipolar R-wave sensing, mV 13 ±5.5 11 ±7.2 14 ±4.8 0.443
Unipolar impedance, ohms 399 ±84.2 372 ±98.9 412 ±77.6 0.153
Bipolar impedance, ohms 571 ±68.7 594 ±104.3 566 ±63.2 0.676
Complications
Acute complications
Pneumothorax, n (%) 1 (2) 1 (5) 0 (0) 0.444
Septal perforation during implant, n (%) Tamponade, n (%) 3 (7) 0 (0) 1 (5) 0 (0) 2 (8) 0 (0) 1.000 /
Echocardiographic evaluation post implant
Ventricular septal defect, n (%) Septal coronary artery fistula, n (%) 0 (0) 1 (2) 0 (0) 1 (5) 0 (0) 0 (0) / 0.444
Complications during follow up
Lead dislodgment, n (%) 0 (0) 0 (0) 0 (0) /
Lead revision, n (%) 0 (0) 0 (0) 0 (0) /
Increase in pacing threshold of > 2V 0 (0) 0 (0) 0 (0) /