Abstract
Changes in posture from supine to erect (head up) elicit changes in the hydrostatic pressure gradient acting on the systemic cerebral circulation. The initial effect of a headup tilt (HUT) is a decrease in mean arterial pressure and a concomitant temporary decrease in blood flow (Patterson and Warren, 1952) which in turn triggers the appropriate myogenic mechanisms to maintain flow. At the venous end, the same changes in posture result in decreased blood volume.
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Martinez-Coll, A., Morgan, M.K., Cooper, P.G., Nguyen, H.T., Hunyor, S.N. (1999). Cerebral Tissue Oxygen Saturation (SrO2) from Near Infrared Spectroscopy (NIRS) Measurements Following 90°-Head-Up Tilt. In: Eke, A., Delpy, D.T. (eds) Oxygen Transport to Tissue XXI. Advances in Experimental Medicine and Biology, vol 471. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-4717-4_15
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DOI: https://doi.org/10.1007/978-1-4615-4717-4_15
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