Table 2.
The association of haemodynamic factors with SctO2 during head-up tilt test in the POTS group (n = 34)
| Dependent variables | Independent variables | B (% points) | P-value (age adjusted) |
|---|---|---|---|
| SctO2 supine | SBP supine | 0.0384 | 0.410 (0.337) |
| SctO2 1 min | SBP 1 min | 0.0657 | 0.191 (0.117) |
| SctO2 3 min | SBP 3 min | 0.0674a | 0.166 (0.095) |
| SctO2 10 min | SBP 10 min | 0.0285b | 0.561 (0.411) |
| SctO2 min | SBP min | 0.0603 | 0.176 (0.107) |
| SctO2 delta min | SBP delta min | 0.1170 | 0.004 (0.003) |
| SctO2 supine | HR supine | 0.0144 | 0.753 (0.722) |
| SctO2 1 min | HR 1 min | −0.0035 | 0.946 (0.958) |
| SctO2 3 min | HR 3 min | −0.0275a | 0.678 (0.694) |
| SctO2 10 min | HR 10 min | 0.0341b | 0.610 (0.645) |
| SctO2 min | HR max | 0.0305 | 0.623 (0.536) |
| SctO2 delta min | HR delta max | 0.0308 | 0.802 (0.809) |
| SctO2 delta 1 min | HR delta 1 min | 0.0360 | 0.221 (0.223) |
| SctO2 delta 3 min | HR delta 3 min | 0.0809a | 0.022 (0.022) |
| SctO2 delta 10 min | HR delta 10 min | −0.0166b | 0.726 (0.687) |
Units for SctO2 percentage points; SBP mmHg; HR b.p.m. SctO2 delta and SBP delta min were calculated as decreases (positive direction), whereas HR delta was calculated as an increase from supine position.
HR, heart rate; POTS, postural orthostatic tachycardia syndrome; SBP, systolic blood pressure; SctO2, cerebral tissue oxygen saturation.
a
Missing values = 1
b
Missing values = 4.