Table 3 Comparison between the two studied groups according to risk factors
Predisposing factors | Total (n = 50) | No decline in LVEF (n = 25) | Decline in LVEF (n = 25) | χ2 | MCp | |||
|---|---|---|---|---|---|---|---|---|
No. | % | No. | % | No. | % | |||
Age (years) | 63.12 ± 16.85 | 67.20 ± 18.54 | 59.04 ± 14.18 | |||||
Mean ± SD | 202.00 | 0.032* | ||||||
Sex | ||||||||
Male | 27 | 54.0 | 14 | 56.0 | 13 | 52.0 | 0.081 | 0.777 |
Female | 23 | 46.0 | 11 | 44.0 | 12 | 48.0 | ||
DM | 13 | 26.0 | 7 | 28.0 | 6 | 24.0 | 0.104 | 0.747 |
HTN | 21 | 42.0 | 14 | 56.0 | 7 | 28.0 | 4.023* | 0.045* |
Device type | ||||||||
VVI | 27 | 54.0 | 15 | 60.0 | 12 | 48.0 | 0.725 | 0.395 |
DDD | 23 | 46.0 | 10 | 40.0 | 13 | 52.0 | ||
Lead site | ||||||||
RVA | 44 | 88.0 | 22 | 88.0 | 22 | 83.0 | 0.00 | 1.000 |
RVS | 6 | 12.0 | 3 | 12.0 | 3 | 12.0 | ||
Pre-existing BBB | ||||||||
No BBB | 22 | 44.0 | 15 | 60.0 | 7 | 28.0 | ||
RBBB | 19 | 38.0 | 7 | 28.0 | 12 | 48.0 | 5.107 | 0.083 |
LBBB | 9 | 18.0 | 3 | 12.0 | 6 | 24.0 | ||
QRS axis | ||||||||
N | 8 | 16.0 | 4 | 16.0 | 4 | 16.0 | ||
LF | 38 | 76.0 | 20 | 80.0 | 18 | 72.0 | 1.514 | 0.883 |
RT | 4 | 8.0 | 1 | 4.0 | 3 | 12.0 | ||
QRS width | ||||||||
Pre-pacing | ||||||||
Mean ± SD | 116.8 ± 32.27 | 104.6 ± 27.99 | 129.0 ± 32.15 | 178.00* | 0.008* | |||
Post-pacing | ||||||||
Mean ± SD | 151.7 ± 21.91 | 148.6 ± 22.98 | 154.8 ± 20.79 | 273.00 | 0.436 | |||
VP% | ||||||||
7 days | ||||||||
Mean ± SD | 84.34 ± 24.83 | 83.40 ± 24.47 | 85.27 ± 25.65 | 285.50 | 0.588 | |||
6 months | ||||||||
Mean ± SD | 89.26 ± 20.62 | 86.80 ± 23.09 | 91.72 ± 17.95 | 289.00 | 0.601 | |||
Pacing threshold | ||||||||
7 days | ||||||||
Mean ± SD | 0.57 ± 0.29 | 0.57 ± 0.20 | 0.57 ± 0.36 | 267.50 | 0.328 | |||
6 months | ||||||||
Mean ± SD | 0.88 ± 0.52 | 0.85 ± 0.49 | 0.90 ± 0.55 | 306.50 | 0.902 | |||