Demographic, Clinical, and Laboratory Characteristics of Patients Investigated
| Characteristic | Non-SVT group (n = 11) | SVT group (n = 15) | P |
| Demographic | |||
| Age (y) | 55 ± 10 | 61 ± 8 | 0.09 |
| Male sex (n) | 7 (64) | 12 (80) | 0.40 |
| 12-lead electrocardiogram | |||
| Heart rate (bpm) | 56 ± 6 | 55 ± 11 | 0.83 |
| Right bundle-branch block (n) | 6 (54) | 10 (67) | 0.68 |
| Left anterior hemiblock (n) | 6 (54) | 7 (47) | 1.00 |
| SVT | |||
| Spontaneous (n) | — | 12 (80) | — |
| Induced (n) | — | 3 (20) | — |
| Heart rate (bpm) | — | 194 ± 27 | — |
| Hemodynamic instability | — | 7 (47) | — |
| RBBB pattern (n) | — | 12 (80) | — |
| Superior axis (n) | — | 10 (67) | — |
| Echocardiographic characteristics | |||
| LVEF | 57 ± 10 | 51 ± 8 | 0.14 |
| Left ventricle diastolic diameter (mm) | 54 ± 7 | 54 ± 6 | 0.94 |
| LVEF > 50% (n) | 8 (73) | 10 (67) | 1.00 |
| Abnormal wall motion (n) | 9 (82) | 13 (87) | 1.00 |
| Ventricular aneurysm (n) | 1 (9) | 1 (7) | 1.00 |
| Holter | |||
| No. of premature ventricular beats in 24 h | 1,654 ± 1,801 | 1,164 ± 2,348 | 0.57 |
| Multiple non-SVT (n) | — | 3 (20) | |
| SD of all normal RR intervals | 134 ± 36 | 113 ± 37 | 0.21 |
| Medication | |||
| Amiodarone (n) | 4 (36) | 15 (100) | <0.05 |
| β-blocker (n) | 2 (18) | 5 (33) | 0.65 |
| Angiotensin-converting enzyme inhibitor (n) | 8 (72) | 11 (73) | 1.00 |
RBBB pattern = SVT with morphologic pattern of right bundle-branch block; superior axis = SVT axis between −30° and −90° on frontal plane.
Data in parentheses are percentages.