Blood flow in internal carotid and vertebral arteries during orthostatic stress
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Blood flow in internal carotid and vertebral arteries during orthostatic stress. / Sato, Kohei; Fisher, James P; Seifert, Thomas; Overgaard, Morten; Secher, Niels H; Ogoh, Shigehiko.
In: Experimental Physiology, Vol. 97, No. 12, 2012, p. 1272-80.Research output: Contribution to journal › Journal article › Research › peer-review
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T1 - Blood flow in internal carotid and vertebral arteries during orthostatic stress
AU - Sato, Kohei
AU - Fisher, James P
AU - Seifert, Thomas
AU - Overgaard, Morten
AU - Secher, Niels H
AU - Ogoh, Shigehiko
PY - 2012
Y1 - 2012
N2 - It remains unclear whether orthostatic stress evokes regional differences in cerebral blood flow. The present study compared blood flow in the internal carotid (ICA) and vertebral (VA) arteries during orthostatic stress (60° head-up tilt; HUT) in 6 healthy young men. ICA and VA blood flow were measured using Doppler ultrasonography. Dynamic cerebral autoregulation was also determined during supine (Supine) and HUT conditions, from the rate of regulation (RoR) in cerebrovascular conductance of the ICA and VA during acute hypotension induced by the release of bilateral thigh cuffs. The HUT decreased ICA blood flow by -9.4 ± 1.7% (P <0.01 vs. Supine), leaving ICA conductance unchanged. In contrast, there was no significant difference in VA blood flow between Supine and HUT and VA conductance increased (+12.9 ± 0.8 %, P <0.01). In addition, dynamic CA in both the ICA and VA was attenuated during HUT and the magnitude of the attenuation in RoR was greater in the VA [0.25 ± 0.03 /s Supine vs. 0.16 ± 0.02 /s HUT (-33.9 ± 5.8 %), P <0.05] compared with the ICA [0.23 ± 0.02 /s vs. 0.20 ± 0.03 /s (-10.6 ± 13.4 %), P > 0.05]. These data indicate that orthostatic stress evokes regional differences in cerebral blood flow, and possible differences in dynamic CA between two main brain vascular areas to an acute change in blood pressure during orthostatic stress.
AB - It remains unclear whether orthostatic stress evokes regional differences in cerebral blood flow. The present study compared blood flow in the internal carotid (ICA) and vertebral (VA) arteries during orthostatic stress (60° head-up tilt; HUT) in 6 healthy young men. ICA and VA blood flow were measured using Doppler ultrasonography. Dynamic cerebral autoregulation was also determined during supine (Supine) and HUT conditions, from the rate of regulation (RoR) in cerebrovascular conductance of the ICA and VA during acute hypotension induced by the release of bilateral thigh cuffs. The HUT decreased ICA blood flow by -9.4 ± 1.7% (P <0.01 vs. Supine), leaving ICA conductance unchanged. In contrast, there was no significant difference in VA blood flow between Supine and HUT and VA conductance increased (+12.9 ± 0.8 %, P <0.01). In addition, dynamic CA in both the ICA and VA was attenuated during HUT and the magnitude of the attenuation in RoR was greater in the VA [0.25 ± 0.03 /s Supine vs. 0.16 ± 0.02 /s HUT (-33.9 ± 5.8 %), P <0.05] compared with the ICA [0.23 ± 0.02 /s vs. 0.20 ± 0.03 /s (-10.6 ± 13.4 %), P > 0.05]. These data indicate that orthostatic stress evokes regional differences in cerebral blood flow, and possible differences in dynamic CA between two main brain vascular areas to an acute change in blood pressure during orthostatic stress.
U2 - 10.1113/expphysiol.2012.064774
DO - 10.1113/expphysiol.2012.064774
M3 - Journal article
C2 - 22689443
VL - 97
SP - 1272
EP - 1280
JO - Experimental Physiology
JF - Experimental Physiology
SN - 0958-0670
IS - 12
ER -
ID: 40193600