Effects of Rotating table Simulated “Push Pull Maneuver" on Cerebral Circulation Function.

Objective To investigate the change and regulation of cerebral circulation during rotating table simulated push pull maneuver. Method A special rotating table was used to simulate the push pull maneuver. 10 healthy adults were subjected to a series of “head up stand (+1Gz) 1 min head down stand (-1Gz) 10 s and head up stand (+1Gz) 1 min" changes. Cerebral blood flow velocity and pulsatility indices in the left middle cerebral artery were constantly measured with a TC2020TCD using Transcanial Dopplor instrument. Result During 10s head down stand (-1Gz) systolic velocity (Vs) increased, diastolic velocity (Vd ) decreased, and the pulsatility indices (PI and RI) increased significantly in the left middle cerebral artery. During subsequent head up stand (+1Gz), these changes didn't resume immediately and maintained for at least 20 s. Conclusion This result implied that the push pull maneuver increased the resistance of the cerebral vessels, which might be one of the mechanisms of the push pull effect.