Cardiac magnetic resonance parameters in CFS compared with matched control values expressed as mean (SD) unless stated
| Controls | CFS | |||
| Total | BNP >400 | BNP <400 | ||
| N | 10 | 42 | 21 | 21 |
| Age (years) | 46 (13) | 46 (12) | 46 (11) | 48 (12) |
| Females (%) | 8 (80%) | 32 (76%) | 15 (71%) | 17 (81%) |
| Fatigue Impact Scale | N/A | 92 (34) | 89 (32) | 95 (36) |
| Ejection fraction (%) | 62 (5.4) | 63 (5.1) | 64 (6) | 63 (4) |
| Stroke volume (mL) | 60 (10) | 57 (13) | 54 (12) | 60 (13) |
| ED volume (mL) | 96 (14.4) | 91 (21.4) | 85 (20) | 95 (20) |
| ES phase (ms) | 327 (47) | 320 (48) | 308 (33) | 336 (58) |
| ES volume (mL) | 37 (8) | 34 (10) | 31 (10) | 35 (8) |
| ED wall mass (g) | 72 (13) | 70 (19) | 72 (18) | 68 (20) |
| ED wall+Pap mass (g) | 80 (13) | 77 (21) | 80 (20) | 75 (22) |
BNP, brain natriuretic peptide; CFS, chronic fatigue syndrome; ED, end diastolic; ES, end systolic.