Table 2.
TCD parameters of subjects with high resting PI and subjects with low resting PI at rest.
| Overall N=104 |
Elevated PI N=27 |
Normal PI N=77 |
P Value | |
|---|---|---|---|---|
| Rest PI | 1.02 ± 0.2 | 1.26 ± 0.1 | 0.95 ± 0.1 | <0.001* |
| Exercise PI | 1.33 ± 0.2 | 1.52 ± 0.3 | 1.26 ± 0.2 | <0.001* |
| Rest MCAv (cm/s) | 47.01± 11.15 | 47.90± 11.9 | 46.62± 11.0 | 0.62 |
| Exercise MCAv (cm/s) | 51.93± 12.6 | 52.30± 12.4 | 51.81± 12.9 | 0.86 |
| Rest Vs (cm/s) | 80.08± 19.8 | 90.45± 22.4 | 76.43± 17.5 | 0.005* |
| Exercise Vs (cm/s) | 94.32± 22.5 | 103.10± 23.6 | 91.4± 21.5 | 0.03* |
| Rest Vd (cm/s) | 31.96 ± 7.0 | 30.13 ± 6.6 | 32.61 ± 7.07 | 0.11 |
| Exercise Vd (cm/s) | 31.18 ± 7.4 | 29.5 ± 6.7 | 31.7 ± 7.6 | 0.2 |
| Rest PETCO2 (mmHg) | 33.97± 4.7 | 33.9± 4.01 | 33.5± 5.2 | 0.96 |
| Exercise PETCO2 (mmHg) | 38.33± 4.2 | 38.1± 4.1 | 38.4± 3.9 | 0.66 |
| Rest MAP (mmHg) | 81.33± 12.1 | 79.37± 13.0 | 83.06± 13.0 | 0.212 |
| Exercise MAP (mmHg) | 112.54± 19.4 | 113.59± 21.5 | 112.0± 21.9 | 0.75 |
| Rest SBP (mmHg) | 131.76± 20.7 | 136.33± 22.8 | 130.13± 19.8 | 0.22 |
| Exercise SBP (mmHg) | 187.62± 34.9 | 192.70± 39.7 | 185.82± 33.2 | 0.44 |
| Rest DBP (mmHg) | 70.80± 11.2 | 66.58± 11.8 | 72.25± 10.61 | 0.03* |
| Exercise DBP (mmHg) | 91.14± 18.03 | 89.2± 17.2 | 91.8± 18.44 | 0.71 |
N=number of subjects; PI= pulsatility index; MCAv=mean middle cerebral artery velocity; Vs= systolic velocity; Vd= diastolic velocity; PETCO2 = end-tidal carbon dioxide; SBP=systolic blood pressure; DBP= diastolic blood pressure. Values are presented as mean ± standard deviation.
*
P < 0.05 for Welch's t-test or Wilcoxon rank sum test between elevated and normal PI percentage absolute values. *P< 0.05 Welch's t-test or Wilcoxon rank sum test between elevated and normal PI percentage change from rest to exercise.