Table 2b.
Tilt-test data of ME/CFS patients with an end-tidal CO2 < 30 mmHg or ≥ 30 mmHg at the end of the tilt test.
| PETCO2 < 30 mmHg at end-tilt (n = 31) |
PETCO2 ≥ 30 mmHg at end-tilt (n = 29) |
p-value | |
|---|---|---|---|
| Tilt test results: | |||
| NormHRBP/dOH/POTS | 10/3/18 | 20/1/8 | 0.02 * |
| HR supine (bpm) | 79 (13) | 75 (12) | 0.22 |
| HR end-tilt (bpm) | 106 (20) | 97 (18) | 0.08 |
| HR post-tilt (bpm) | 74 (12) | 72 (10) | 0.38 |
| SBP supine (mmHg) | 142 (19) | 137 (18) | 0.24 |
| SBP end-tilt (mmHg) | 135 (24) | 134 (21) | 0.95 |
| SBP post-tilt (mmHg) | 138 (18) | 133 (15) | 0.26 |
| DBP supine (mmHg) | 86 (12) | 83 (10) | 0.30 |
| DBP end-tilt (mmHg) | 89 (15) | 92 (13) | 0.41 |
| DBP post-tilt (mmHg) | 85 (12) | 81 (9) | 0.20 |
| PETCO2 supine (mmHg) | 34 (3) | 39 (2) | <0.0001 |
| PETCO2 end-tilt (mmHg) | 25 (3) | 33 (3) | <0.0001 |
| PETCO2 post-tilt (mmHg) | 31 (4) | 36 (3) | <0.0001 |
| CI supine (L/min/m2) | 2.63 (0.55) | 2.59 (0.42) | 0.74 |
| CI end-tilt (L/min/m2) | 2.08 (0.47) | 1.96 (0.33) | 0.27 |
| CI post-tilt (L/min/m2) | 2.66 (0.52) | 2.56 (0.43) | 0.43 |
| CBF supine (ml/min) | 552 (101) | 620 (78) | 0.005 |
| CBF end-tilt (ml/min) | 383 (70) | 449 (70) | 0.0006 |
| CBF post-tilt (ml/min) | 454 (74) | 527 (83) | 0.0007 |
CBF: cerebral blood flow; CI: cardiac index; DBP: diastolic blood pressure; HR: Heart rate; normHRBP: normal heart rate and blood pressure response; PET: end-tidal pressure; POTS: postural orthostatic tachycardia syndrome; SBP: systolic blood pressure; * Chi-square.