Clinical findings at first-line evaluation in asymptomatic or mildly symptomatic SARS-CoV-2-positive junior athletes
| Variables | n=571 |
| Resting and exercise ECG | |
| Resting HR (bpm) | 78±15 |
| PR interval (ms) | 143±22.6 |
| First-degree atrioventricular block, n (%) | 4 (0.7) |
| QRS interval (ms) | 84±9 |
| QRS axis (°) | 67±18 |
| Incomplete RBBB, n (%) | 90 (15.7) |
| Complete RBBB, n (%) | 6 (1) |
| QTc duration (ms) | 388±30 |
| Pathological T wave inversion, n (%) | 0 (0) |
| Abnormal resting ECG, n (%) | 0 (0) |
| Athletes with common PVBs during exercise testing, n (%) | 24 (4.2) |
| Athletes with uncommon PVBs during exercise testing, n (%) | 0 (0) |
| ST-T abnormalities during exercise, n (%) | 0 (0) |
| Echocardiography | |
| LV EDD (mm) | 45.9±5.0 |
| LV ESD (mm) | 27.6±4.5 |
| IVST (mm) | 7.8±1.2 |
| PWT (mm) | 7.7±1.2 |
| LV EF (%) | 63.5±4.7 |
| LV wall motion abnormalities, n (%) | 0 (0) |
| Aortic root (mm) | 27.1±3.7 |
| Ascending aorta (mm) | 25.0±3.6 |
| Aortic arch (mm) | 21.3±2.9 |
| LA area (cm2) | 16.1±4.5 |
| LA volume (mL) | 29.5±9.8 |
| LA volume index (mL/m2) | 18.2±5.3 |
| Mid-cavity RV diameter (mm) | 28.2±7.2 |
| TAPSE (mm) | 24.2±3.1 |
| s’ velocity (m/s) | 0.14±0.02 |
| RV wall motion abnormalities, n (%) | 0 (0) |
| IVC diameter (mm) | 16.6±4.5 |
| Pericardial involvement, n (%) | 18 (3.2) |
| Small pericardial effusion, n (%) | 15 (2.6) |
| Moderate pericardial effusion, n (%) | 1 (0.2) |
| Small pericardial effusion with a final diagnosis of pericarditis, n (%) | 2 (0.4) |
| Other abnormalities | |
| Bicuspid aortic valve | 6 (1.1) |
| Mitral valve prolapse | 5 (0.9) |
| Atrial septal defect | 1 (0.2) |
| Patent foramen ovale | 4 (0.7) |
| Patent ductus arteriosus | 1 (0.2) |
IVC; inferior vena cava.EDD, end-diastolic diameter; EF, ejection fraction; ESD, end-systolic diameter; HR, heart rate; IVST, interventricular septum thickness; LA, left atrial; LV, left ventricular; PVB, premature ventricular beats; PWT, posterior wall thickness; RBBB, right bundle branch block; RV, right ventricular; TAPSE, tricuspid annular plane systolic excursion.