Table 1.
Baseline characteristics of patients with and without significant left ventricular dyssynchrony (≥60 and <60 ms, respectively)
| Variables | Baseline LV dyssynchrony |
P-value | |
|---|---|---|---|
| ≥60 ms (n= 290) | <60 ms (n= 290) | ||
| Age (years) | 65 ± 11 | 67 ± 10 | 0.196 |
| Gender (male/female) | 216 /74 | 225 /65 | 0.218 |
| Ischaemic aetiology, n (%) | 161 (56%) | 173 (59%) | 0.413 |
| NYHA | 3.04 ± 0.21 | 3.08 ± 0.32 | 0.236 |
| 6MWT (m) | 310 ± 113 | 310 ± 118 | 0.983 |
| QoL score | 35 ± 18 | 34 ± 19 | 0.695 |
| QRS duration (ms) | 157 ± 34 | 152 ± 31 | 0.016 |
| QRS < 150 ms, n (%) | 109 (38%) | 131 (45%) | 0.064 |
| QRS morphology | |||
| LBBB | 209 (72%) | 201 (69%) | 0.262 |
| RBBB | 13 (5%) | 26 (9%) | 0.023 |
| IVCD | 68 (23%) | 63 (22%) | 0.383 |
| LVEDV | 224 ± 78 | 206 ± 74 | 0.005 |
| LVESV | 169 ± 68 | 156 ± 67 | 0.016 |
| LVEF (%) | 25 ± 8 | 25 ± 8 | 0.745 |
| LV dyssynchrony (ms) | 100 (80–120) | 22 (16–34) | <0.001 |
Continuous variables are expressed as mean ± SD. Left ventricular dyssynchrony is expressed as median and inter-quartile range. Categorical variables are expressed as n (%).
6MWT, 6 min walk distance test; IVCD, unspecified intraventricular conduction delay; LBBB, left bundle branch block; LVEDV, left ventricle end-diastolic volume; LVEF, left ventricle ejection fraction; LVESV, left ventricle end-systolic volume; NYHA, New York Heart functional class; QoL, quality-of-life questionnaire (Minnesota living with Heart Failure); RBBB, right bundle branch block.