Table 4.
SctO2 in POTS patients during head-up tilt test according to syncope/no syncope, spontaneous vasovagal syncope/no spontaneous vasovagal syncope, and dizziness/no dizziness during the test
| Syncope (n = 15) | No syncope (n = 19) | P-value | |
|---|---|---|---|
| SctO2 supine | 71.3 ± 6.2 | 70.9 ± 2.8 | 0.817 |
| SctO2 1 min | 69.1 ± 7.5 | 67.8 ± 4.3 | 0.516 |
| SctO2 3 min | 68.5 ± 7.4 | 67.1 ± 4.6b | 0.506 |
| SctO2 10 min | 69.3 ± 6.0a | 66.7 ± 5.2b | 0.227 |
| SctO2 min | 65.7 ± 6.7 | 65.2 ± 4.7 | 0.772 |
| SctO2 delta | 5.6 ± 2.6 | 5.7 ± 3.2 | 0.843 |
|
| |||
| Spontaneous VVS (n = 7) | No spontaneous VVS (n = 27) | P-value | |
|
| |||
| SctO2 supine | 70.6 ± 4.7 | 71.2 ± 4.6 | 0.756 |
| SctO2 1 min | 69.1 ± 5.4 | 68.2 ± 6.1 | 0.707 |
| SctO2 3 min | 68.6 ± 6.3 | 67.5 ± 6.0b | 0.692 |
| SctO2 10 min | 70.0 ± 4.1a | 67.4 ± 5.7b | 0.389 |
| SctO2 min | 65.1 ± 5.4 | 65.5 ± 5.8 | 0.890 |
| SctO2 delta | 5.4 ± 3.4 | 5.7 ± 2.9 | 0.828 |
|
| |||
| Dizziness (n = 25) | No dizziness (n = 9) | P-value | |
|
| |||
| SctO2 supine | 71.1 ± 5.3 | 71.0 ± 1.5 | 0.946 |
| SctO2 1 min | 68.2 ± 6.7 | 68.9 ± 2.6 | 0.668 |
| SctO2 3 min | 67.8 ± 6.7 | 67.8 ± 3.2b | 0.995 |
| SctO2 10 min | 68.0 ± 6.1c | 66.7 ± 3.1c | 0.588 |
| SctO2 min | 65.4 ± 6.3 | 65.4 ± 3.4 | 0.984 |
| SctO2 delta | 5.7 ± 2.7 | 5.6 ± 3.6 | 0.914 |
Units for SctO2 percentage points.
POTS, postural orthostatic tachycardia syndrome; SctO2, cerebral tissue oxygen saturation; VVS, vasovagal syncope.
a
Missing data points: n = 3.
b
Missing data points: n = 1.
c
Missing data points: n = 2.