Table 2.
Comparison between electrical and mechanical variables in the responder and non-responder subgroups
| Responder (n = 39) | Non-responder (n = 16) | P-value | |
|---|---|---|---|
| EF (%) | 26 (23–31) | 23 (22–28) | 0.70 |
| EM coupling (unitless) | 0.80 (0.63–0.88) | 0.83 (0.60–0.89) | 0.94 |
| QRS duration (ms) | 155 (140–176) | 167 (155–177) | 0.11 |
| TST (ms) | 50 (20–58) | 33 (8–44) | 0.04 |
| TLVAT (ms) | 81 (73–97) | 112 (96–127) | <0.01 |
| TST/TLVAT (%) | 55 (23–84) | 29 (6–43) | 0.01 |
| TLVMT (ms) | 123 (95–163) | 145 (115–161) | 0.28 |
| SSI (unitless) | 10.7 (7.1–16.8) | 4.2 (2.9–5.5) | <0.01 |
| Scar (%) | 0.0 (0.0–1.2) | 8.7 (0.0–19.1) | 0.01 |
Data expressed as median (1st–3rd) quartiles, or expected value (95% confidence interval). Bold values refers to significant p-values (p < 0.05), consistently with the description in the statistical analysis sub-section.
P-value refers to responder vs. non-responder, Mann–Whitney U test.
CI, confidence interval; EF, ejection fraction; EM, electromechanical coupling: Pearson’s R of TD-TPS; TLVAT, total left-ventricular activation time; TLVMT, total left-ventricular mechanical time; TD, time of depolarization; TPS, time-to-peak shortening; TST, transseptal time.