Table 3

Chronic Response to Guide Implants (n = 21)

ParameterBaseline ± SD6 Mo ± SDp Value
QRSd163.8 ± 26.7134.8 ± 25.60.002
LVESV112.7 ± 64.485.9 ± 52.3<0.0001
LVEF34.2 ± 7.839 ± 9.80.008

LVESV = left ventricular end-systolic volume; SD = standard deviation; other abbreviation as in Table 1.