Parameters | Healthy young volunteers mean ± SD (max–min) | Healthy elderly volunteers mean ± SD (max–min) | p-values |
---|---|---|---|
n | 16 | 19 | |
Age | 31 ± 7 (26–44) | 73 ± 6 (63–82) | *** |
ExtraACBF (ml/min) | 716 ± 129 (531–933) | 588 ± 119 (396–771) | 0.007** |
IntraACBF (ml/min) | 670 ± 158 (329–951) | 593 ± 107 (343–753) | 0.12ns |
p-values | 0.4ns | 0.7ns | |
Mean Total Arterial Cerebral Blood Flow (ml/min) | 693 ± 117 (433–899) | 591 ± 102 (370–740) | 0.006** |
ExtraVCBF (ml/min) | 449 ± 173 (250–778) | 533 ± 161 (171–707) | 0.09ns |
IntraVCBF (ml/min) | 478 ± 94 (365–682) | 379 ± 88 (171–501) | 0.01* |
p-values | 0.66ns | 0.0002*** | |
αExtra | 1.67 ± 0.75 (0.95–3.71) | 1.24 ± 0.52 (0.65–2.44) | 0.01* |
αIntra | 1.52 ± 0.34 (0.99–2.38) | 1.59 ± 0.41 (0.99–2.64) | 0.81ns |
p-values | 0.68ns | 0.038* | |
Extra blood SV (ml/cc) | 0.91 ± 0.39 (0.49–2.08) | 0.98 ± 0.32 (0.48–1.61) | 0.24ns |
Intra blood SV (ml/cc) | 0.76 ± 0.30 (0.29–1.28) | 1.08 ± 0.21 (0.53–1.57) | 0.001** |
p-values | 0.21ns | 0.31ns | |
Spinal CSF SV (ml/cc) | 0.34 ± 0.21 (0.08–0.86) | 0.51 ± 0.20 (0.16–0.89) | 0.02* |
Aqueductal CSF SV (ml/cc) | 0.04 ± 0.02 (0.01–0.08) | 0.05 ± 0.03 (0.01–0.10) | 0.26ns |
Extra arterial PI | 0.85 ± 0.17 (0.45–1.11) | 1.31 ± 0.32 (1.01–2.05) | 4.78 × 10–8*** |
Intra arterial PI | 0.77 ± 0.22 (0.30–1.04) | 1.16 ± 0.17 (0.86–1.55) | 2.50 × 10–7*** |
p-values | 0.06ns | 0.003** | |
Intra Venous PI | 0.25 ± 0.16 (0.03–0.70) | 0.52 ± 0.16 (0.34–0.97) | 3.54 × 10–6*** |
Extra Venous PI | 0.47 ± 0.25 (0.14–0.91) | 0.86 ± 0.40 (0.34–1.89) | 0.002*** |
p-values | 0.001 ** | 0.0002*** | |
Heart rate (beats/min) | 69 ± 14 (47–95) | 70 ± 11 (60–100) | 0.72ns |