Table 1. Clinical characteristics of patients with CFS–POTS and non-CFS–POTS.
Values are means±S.E.M., unless otherwise stated.
| Clinical characteristics | Non-CFS–POTS (n=17) | CFS–POTS (n=30) | P value |
|---|---|---|---|
| Age (years) | 33±2 | 30±2 | 0.121 |
| BMI (kg/m2) | 23±1 | 24±1 | 0.877 |
| Duration of disease (months)* | 55±14 | 72±11 | 0.231 |
| Prior medication use† | |||
| β-Blockers (n) | 11 (65%) | 19 (63%) | 0.925 |
| Fludrocortisone acetate (n) | 4 (24%) | 11 (37%) | 0.353 |
| Haematocrit (%) | 40±1 | 40±1 | 0.321 |
| Na+ (mM/l) | 139±0.6 | 140±0.4 | 0.296 |
| K+ (mM/l) | 4.0±0.1 | 3.9±0.1 | 0.480 |
| Calculated plasma osmolality (mM/l) | 286±1 | 288±1 | 0.301 |
| Plasma creatinine (mg/dl) | 0.8±0.03 | 0.8±0.02 | 0.420 |
*Duration of disease calculated from the onset of orthostatic symptoms.
†Medications reported within 6 months before admission.