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. Author manuscript; available in PMC: 2010 Jun 1.
Published in final edited form as: Stroke. 2009 Apr 9;40(6):2062–2067. doi: 10.1161/STROKEAHA.108.545285

Table 2.

Blood Flow Velocity and Autoregulation in the PCA and MCA Territories While Sitting

PCA MCA P value
Systolic BFV, cm/s 58 ± 3 88 ± 5 <0.0001
Diastolic BFV, cm/s 20 ± 2 32 ± 2 <0.0001
Mean BFV, cm/s 35 ± 2 55 ± 3 <0.0001
CVRi, mmHg·s·cm-1 2.74 ± 0.20 1.87 ± 0.19 0.002
Gain
 Low 1.41±0.09 1.18±0.07 0.003
 High 2.06±0.12 1.61±0.08 0.0001
 Cardiac 1.96±0.08 1.86±0.07 0.07
Coherence
 Low 0.56±0.03 0.61±0.03 0.08
 High 0.63±0.03 0.62±0.03 0.56
 Cardiac 0.99±0.00 0.99±0.00 0.04
Phase
 Low −40.79±4.56 −45.91±4.39 0.08
 High −37.07±4.98 −42.75±5.40 0.32
 Cardiac −23.45±5.52 −24.11±4.44 0.90

Comparison of the PCA and the MCA in EO sitting position (n = 45) are shown. BFV, blood flow velocity; CVRi, cerebrovascular resistance index. Transfer function coherence, gain, and phase relating fluctuations in arterial blood pressure and cerebral blood flow velocity in the low-frequency range (Low: 0.03 – 0.07 Hz), high-frequency (High: 0.07 – 0.15 Hz), and cardiac-frequency range (Cardiac: within beat). Phase shift angle in degrees. All values are given as mean ± SE.