Table 3

Mean Differences Between Epicardial and Endocardial Datasets

EpicardialEndocardialp Value
Best achievable AHRs in each patient(N = 8)(N = 8)
 Mean change in AHR (%)12.64 ± 6.7625.64 ± 14.740.044
 Mean QLV (ms)67 ± 3395 ± 380.216
 Mean stimulation-QRS duration (ms)19 ± 814 ± 50.126
 Mean paced QRS duration (ms)167 ± 33137 ± 260.002
Worst AHR in each patient(N = 8)(N = 8)
 Mean change in AHR (%)−0.80 ± 6.81−0.93 ± 3.790.964
 Mean QLV (ms)68 ± 3959 ± 150.556
 Mean stimulation-QRS duration (ms)26 ± 2116 ± 40.187
 Mean paced QRS duration (ms)174 ± 32154 ± 340.164
Comparison of LVendo opposite the corresponding position of LVepi1 and LVepi2(N = 16)(N = 16)
 Mean change in AHR (%)7.60 ± 6.315.2 ± 10.70.014
 Mean QLV (ms)79 ± 3470 ± 380.512
 Mean stimulation-QRS duration (ms)20 ± 1316 ± 70.214
 Mean paced QRS duration (ms)166 ± 30137 ± 22<0.001

Values are mean ± SD.

LVendo = endocardial pacing; LVepi = epicardial pacing; other abbreviations as in Tables 1 and 2.