Table 2.
Electrocardiographic findings in the studied groups
| Variable | Control group (n = 50) | Static group (n = 20) | Dynamic group (n = 30) | P value |
|---|---|---|---|---|
| QTc interval (milliseconds) | 401.78 ± 25.61 | 399.93 ± 29.61 | 393.18 ± 32.46 | 0.42 |
| QT dispersion (seconds) | 0.03 ± 0.003 | 0.03 ± 0.004 | 0.05 ± 0.07 | 0.12 |
| QRS complex duration (milliseconds) | 72.01 ± 12.46 | 72.32 ± 11.82 | 72.5 ± 11.44 | 0.98 |
| R amplitude (mm) | 15.73 ± 4.29 | 27.27 ± 5.66 | 17.94 ± 4.66 | <0.001a |
| Sinus bradycardia (HR < 60 beats/minute) | 8 (16%) | 10 (50%) | 13 (43%) | 0.03b |
| Premature ventricular contraction | 4 (8%) | 3 (15%) | 4 (13.3%) | NA |
| R amplitude > 35 mm | 0 (0) | 3 (15%) | 0 (0) | NA |
| Inverted T-waves | 0 (0) | 1 (5%) | 0 (0) | NA |
| Heart block (PR interval > 120 milliseconds) | 0 (0) | 1 (5%) | 1 (3.3%) | NA |
| P morphology (RAA) | 3 (6%) | 2 (10%) | 6 (20%) | NA |
| P morphology (LAA) | 2 (4%) | 2 (10%) | 1 (3.3%) | NA |
| Q-waves | 0 (0) | 1 (5%) | 0 (0) | NA |
| Incomplete RBBB | 10 (20%) | 6 (30%) | 11 (36.6%) | 0.04c |
Notes: Data presented as either mean ± standard deviation or n (%).
a
Control versus static (P < 0.001), static versus dynamic (P = 0.001);
b
control versus static (P = 0.01) and dynamic (P = 0.03);
c
control versus static (P = 0.04) and dynamic (P = 0.03).
Abbreviations: HR, heart rate; LAA, left atrial appendage; NA, not available; QTc, QT interval corrected for the heart rate; RAA, right atrial appendage; RBBB, right bundle branch block.