Clinical and laboratory data in the study population
| Variable |
Number of patients or mean (SD), range |
| Total population | 40 |
| Aetiology | |
| Idiopathic | 23 |
| Other causes | 17 |
| Anthracyclin | 7 |
| Mitochondrial respiratory chain defect | 7 |
| Postarrhythmia | 2 |
| Postischaemia | 1 |
| Age (years) | 7 (6), 3 months to 20 years |
| Sex (male/female) | 21/19 |
| Cardiothoracic index (%) | 57 (16) |
| Indexed end diastolic diameter (mm/m2) | 67 (31), 31–163 |
| Indexed end systolic diameter (mm/m2) | 56 (28), 23–147 |
| Echocardiographic fractional shortening (%) | 17 (6), 8–27 |
| Cardiac MIBG uptake (H/M ratio) | 1.67 (0.29), 1.1–2.2 |
| MIBG washout rate (%) | 30 (11), 10–62 |
| Plasma noradrenaline (pg/ml) | 249 (325) |
| Follow up period (months) | 12 (10), 1–38 |
H/M ratio, heart to mediastinum activity ratio 4 hours after MIBG injection.