Table 4. Comparison of ECG characteristics according to cardiovascular events.
| Cardiovascular events (+) (n = 53) | Cardiovascular events (-) (n = 90) | p value | |
|---|---|---|---|
| Baseline ECG | |||
| Heart rate (beats/min) | 71.8±12.6 | 68.8±13.0 | 0.1838 |
| QRS duration (ms) | 92.8±7.4 | 94.0±7.6 | 0.3816 |
| Follow-up ECG | |||
| Heart rate (beats/min) | 67.5±17.7 | 67.8±12.7 | 0.8818 |
| QRS duration (ms) | 142.7±14.1 | 138.3±11.3 | 0.0398 |
| Temporal increase in QRS duration (ms/year)* | 6.1±6.5 | 4.4±2.7 | 0.0310 |
| RBBB pattern (n, %) | 25, 47.2 | 74, 82.2 | <0.0001 |
| RBBB pattern with LAH (n, %) | 6, 11.3 | 3, 3.3 | 0.0629 |
| LBBB pattern (n, %) | 15, 28.3 | 7, 7.8 | 0.0012 |
| NSIVCD pattern (n, %) | 7, 13.2 | 6, 6.7 | 0.1969 |
Data are presented as mean ± SD or n (%). RBBB = right bundle branch block, LAH = left anterior hemiblock, LBBB = left bundle branch block, NSIVCD = nonspecific intraventricular conduction disturbance.
*Temporal increase indicates the difference in measures of QRS duration between the baseline ECG and the follow-up ECG.