Cardiology Research and Practice

Clinical Study

The Use of Epicardial Electrogram as a Simple Guide to Select the Optimal Site of Left Ventricular Pacing in Cardiac Resynchronization Therapy

Table 2

Comparison of echocardiography and electrical parameters in responders and nonresponders.
RespondersNonrespondersP
Spontaneous QRS duration (ms) 1 7 7 ± 3 1 1 8 0 ± 2 6 .69
ED (ms) 1 3 9 ± 3 5 1 1 9 ± 3 7 .03
Ratio of ED/QRS duration 0 . 7 8 ± 0 . 1 5 0 . 6 8 ± 0 . 1 9 .02
LVEF (%) 2 5 ± 8 2 0 ± 7 .01
Baseline LVESV (mL) 1 8 2 ± 5 7 2 4 0 ± 6 3 <.001
Baseline LVEDV (mL) 2 6 9 ± 6 2 3 1 9 ± 7 5 .005
Δ LVEF (%)+ 1 9 . 5 ± 1 1 . 9 − 0 . 8 ± 7 . 7 <.001
Δ LVESV (mL)− 5 5 ± 7 2 + 5 ± 6 2 .002
Δ LVESV (mL)− 6 8 ± 6 6 + 5 ± 5 8 .001
Abbreviations: ED: electrical delay, LVEF: left ventricular ejection fraction, Δ LVEF: difference of LVEF between followup and baseline, LVESV: left ventricular end-systolic volume, LVEDV: left ventricular end-diastolic volume, Δ LVESV: difference of LVESV between followup and baseline, Δ LVESD: difference of LVESV between followup and baseline.