Table 1.
Haemodynamic variables and loop areas in experimental study
| LBBB group |
Ischaemia group |
|||||
|---|---|---|---|---|---|---|
| Baseline (n = 6) | LBBB (n = 6) | Baseline (n = 6) | Ischaemia (n = 6) | |||
| Haemodynamic variables and ECG | ||||||
| Heart rate (b.p.m.) | 121 ± 17 | 122 ± 13 | 107 ± 16 | 134 ± 9* | ||
| QRS width (ms) | 68 ± 5 | 116 ± 7* | 69 ± 9 | 67 ± 8 | ||
| LV dP/dtmax (mmHg/s) | 1284 ± 198 | 1098 ± 189 | 1794 ± 337 | 1737 ± 102 | ||
| LV EDP (mmHg) | 10 ± 3 | 10 ± 4 | 8 ± 1 | 10 ± 2 | ||
| Peak LVP (mmHg) | 96 ± 12 | 94 ± 9 | 111 ± 11 | 114 ± 9 | ||
| Loop areas | ||||||
| Septum | Lateral wall | Septum | Lateral wall | Anterior wall | Anterior wall | |
| Invasive method | ||||||
| Loop area by LV pressure–strain(mmHg %) | 693 ± 256 | 659 ± 264 | 155 ± 289* | 1024 ± 486* | 932 ± 239 | 322 ± 250* |
| Non-invasive method | ||||||
| Loop area by estimated LVpressure–strain (mmHg %) | 839 ± 230 | 770 ± 269 | 227 ± 278* | 1031 ± 475* | 914 ± 242 | 295 ± 221* |
Values are mean ± SD. LBBB, left bundle branch block; EDP, end-diastolic pressure; anterior wall affected by ischaemia. Strain was measured by speckle tracking echocardiography.
*P < 0.05 vs. baseline.