Correlation of Eye-Level Blood Flow Velocity and Blood Pressure During +GZ Acceleration

Eye-level blood flow and blood pressure changes were correlated on the USAFSAM human centrifuge during both rapid onset ROR, 1Gsec and gradual onset runs GOR, 0.1 Gsec. A transcutaneous Doppler ultrasonic flowmeter was used to monitor temporal artery blood flow Qta direct blood pressure was obtained by cannulation of a radial artery and measured at eye level with a Statham P-37 miniature transducer. Eye-level mean blood pressure Pa decreased to 20 mm Hg and zero forward Qta occurred 6 sec range 4-9 sec prior to blackout in experienced centrifuge subjects during RORs. The same degree of correlation was not seen during GORs.