Table IV.
Summary of ECG findings and heart rhythm abnormalities
| Electrocardiographic findings | Number | % |
|---|---|---|
| No significant ECG changes throughout illness | 21 | 33.3 |
| Transient first-degree AV block | 16 | 25.4 |
| Positive (abnormal) PR:HR slope | 22 | 37 |
| Transient QRS prolongation | 6 | 9.5 |
| RBBB pattern | 3 | 4.8 |
| LBBB pattern | 1 | 1.6 |
| Non-specific intraventricular delay | 2 | 3.2 |
| Transient QTc prolongation | 14 | 22.2 |
| ST segment changes | 5 | 7.9 |
| Pericarditis type ST elevation | 1 | 1.6 |
| Ischaemic (regional) ST elevation | 1 | 1.6 |
| ST depression | 3 | 4.8 |
| Transient TWI | ||
| All precordial leads (V1-6) | 32 | 51.0 |
| Lateral precordial leads (V4-6) | 15 | 23.8 |
| Inferior leads (II, aVF) | 13 | 20.6 |
| Tachyarrhythmias | 2 | 3.2 |
| Non-sustained atrial ectopic tachycardia | 1 | 1.6 |
| Broad complex tachycardia (atrial tachycardia) | 1 | 1.6 |
| Bradyarrhythmias | 11 | 17.5 |
| First degree AV block +/- AV Wenckebach | 4 | 6.3 |
| Junctional rhythm | 4 | 6.3 |
| Low atrial rhythm | 3 | 4.8 |
LBBB, left bundle branch block; RBBB, right bundle branch block.