Table 2.
Various electrocardiographic and Holter monitoring parameters of the study patients
| Variables | Study patients (n = 341) |
|---|---|
| Mean heart rate | 77 (69–83) |
| QT interval (ms) | 420 (390–430) |
| QTc interval (ms) | 390 (370–410) |
| Sinus QRS duration (ms) | 80 (80–100) |
| PVC QRS duration (ms) | 130 (120–140) |
| PVC coupling interval (ms) | 450 (420–500) |
| PVC burden (beat/24 hr) | 8,400 (3,786–17,857) |
| PVC burden (%) | 9.0 (4.0–17.4) |
| Multifocal PVC (=yes) [n (%)] | 52 (15.2) |
| Circadian variability (=yes) [n (%)] | 52 (15.2) |
| Interpolation (=yes) [n (%)] | 89 (26.5) |
| Anatomic SOO of PVC | |
| RVOT [n (%)] | 164 (47.5) |
| LVOT [n (%)] | 90 (26.5) |
| Parahisian [n (%)] | 15 (4.4) |
| TV [n (%)] | 8 (2.3) |
| Moderator band [n (%)] | 3 (0.9) |
| AMC [n (%)] | 10 (2.9) |
| MV [n (%)] | 24 (7.0) |
| Papillary muscles [n (%)] | 17 (5.0) |
| Fascicles [n (%)] | 8 (2.3) |
| Epicardial [n (%)] | 4 (1.2) |
| Features of electrocardiographic morphology of PVC | |
| Positive Lead 1 + Inferior ax [n (%)] | 155 (45.5) |
| Negative Lead 1 + Inferior ax [n (%)] | 146 (42.8) |
| LBBB + Superior ax [n (%)] | 12 (3.5) |
| RBBB + Superior ax [n (%)] | 28 (8.2) |
Data are expressed as median interquartile range and count (percentage).
Abbreviations: AMC, aortomitral continuity; LBBB, left bundle branch block; LV, left ventricle; LVOT, left ventricular outflow tract; MV, mitral valve; PVC, premature ventricular complex; RBBB, right bundle branch block; RVOT, right ventricular outflow tract; SOO, site of origin; TV, tricuspid valve.