Predisposing factors | No decline in LVEF (n = 25) | Decline in LVEF | χ2 | MCp | ||||
---|---|---|---|---|---|---|---|---|
PIVD (n = 19) | PICMP(n = 6) | |||||||
No. | % | No. | % | No. | % | |||
Age (years) | 67.20 ± 18.54 | 57.11 ± 14.77 | 65.17 ± 10.94 | |||||
Mean ± SD | 5.565 | 0.062 | ||||||
Sex | ||||||||
Male | 14 | 56.0 | 9 | 47.4 | 4 | 66.7 | 0.790 | 0.786 |
Female | 11 | 44.0 | 10 | 52.6 | 2 | 33.3 | ||
DM | 7 | 28.0 | 3 | 15.8 | 3 | 50.0 | 2.858 | 0.231 |
HTN | 14 | 56.0 | 4 | 21.1 | 3 | 50.0 | 5.650 | 0.060 |
Device type | ||||||||
VVI | 15 | 60.0 | 10 | 52.6 | 2 | 33.3 | 1.410 | 0.517 |
DDD | 10 | 40.0 | 9 | 47.4 | 4 | 66.7 | ||
Lead site | ||||||||
RVA | 22 | 88.0 | 17 | 89.5 | 5 | 83.3 | 0.592 | 1.000 |
RVS | 3 | 12.0 | 2 | 10.5 | 1 | 16.7 | ||
Pre-existing BBB | ||||||||
No BBB | 15 | 60.0 | 7 | 36.8 | 0 | 0.0 | ||
RBBB | 7 | 28.0 | 8 | 42.1 | 4 | 66.7 | 8.244 | 0.063 |
LBBB | 3 | 12.0 | 4 | 21.1 | 2 | 33.3 | ||
QRS Axis | ||||||||
N | 4 | 16.0 | 3 | 15.8 | 1 | 16.7 | ||
LF | 20 | 80.0 | 13 | 68.4 | 5 | 83.3 | 3.566 | 0.881 |
RT | 1 | 4.0 | 3 | 12.0 | 0 | 0.0 | ||
QRS width | ||||||||
Pre-pacing | ||||||||
Mean ± SD | 104.6 ± 27.99 | 125.0 ± 32.53 | 141.7 ± 29.94 | 7.848* | 0.020* | |||
Post-pacing | ||||||||
Mean ± SD | 148.6 ± 22.98 | 154.2 ± 19.46 | 156.7 ± 26.58 | 0.660 | 0.719 | |||
VP% | ||||||||
7 days | ||||||||
Mean ± SD | 83.40 ± 24.47 | 81.57 ± 28.32 | 97.0 ± 7.35 | 4.136 | 0.126 | |||
6 months | ||||||||
Mean ± SD | 86.80 ± 23.09 | 89.11 ± 19.99 | 100.0 ± 0.0 | 3.848 | 0.146 | |||
Pacing threshold | ||||||||
7 days | ||||||||
Mean ± SD | 0.57 ± 0.20 | 0.61 ± 0.41 | 0.46 ± 0.10 | 1.627 | 0.443 | |||
6 months | ||||||||
Mean ± SD | 0.85 ± 0.49 | 0.92 ± 0.62 | 0.83 ± 0.26 | 0.184 | 0.912 |