Effect of head up tilt on cerebral circulation.
This study was performed to study the effect of the head up tilt (HUT) on cerebral circulation across the time course (60 degrees HUT for 15 minutes) and across the different angles of HUT (15, 30, 45, 60 degrees HUT for 15 minutes).  Cerebral circulation was continuously monitored during 15 minutes of HUT by the carotid Doppler flow meter, the transcranial Doppler flow meter, and the near infra-red spectrophotometer.  The results show that the cerebral blood flow decreased during HUT and that the cerebral blood volume decreased initially and then gradually increased.  And the magnitude of the effect may have the relationship with the angles of the HUT.
Yoshimoto
S
S
Dept. of Neurosurgery, Tokyo Police Hospital, Japan.
Ueno
T
T
Mayanagi
Y
Y
Sekiguchi
C
C
Yumikura
S
S
Miyamoto
A
A
Yajima
K
K
D001794:Blood Pressure / Q000502:physiology; D002339:Carotid Arteries / Q000000981:diagnostic imaging; D002560:Cerebrovascular Circulation / Q000502:physiology*; D015150:Echocardiography, Doppler; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006439:Hemodynamics / Q000502:physiology*; D006454:Hemoglobins / Q000378:metabolism*; D006801:Humans; D007024:Hypotension, Orthostatic / Q000000981:diagnostic imaging / Q000503:physiopathology*; D017078:Laser-Doppler Flowmetry / Q000295:instrumentation; D008297:Male; D011187:Posture / Q000502:physiology*; D019265:Spectroscopy, Near-Infrared; D018667:Tilt-Table Test; D017585:Ultrasonography, Doppler, Transcranial
D006454:Hemoglobins