VENOUS PRESSURE-HEAD

SUMMARY

1. When standing, anything above the heart has negative pressure & veins tends to collapse.

2. Superior sagittal sinus may be as much as -10mmHg i.e. the pressure is 10mmHg less than that of heart.

3. Magnitude of negative pressure is proportionate to the vertical distance up.

4. Dural sinuses have rigid walls and cannot collapse the pressure in them during standing or sitting, therefore remain subatmospheric.

Reference(s)

Barrett, K.E., Barman, S.M., Boitano, S., Brooks, H.L., Weitz, M., Brian Patrick Kearns, Ganong, W.F. and Mcgraw-Hill Education (Firm (2016). Ganong’s review of medical physiology. 25th ed. New York: Mcgraw Hill Education.
Hall, J.E. and Hall, M.E. (2020). Guyton And Hall Textbook Of Medical Physiology. 14th ed. S.L.: Elsevier - Health Science.
West, J.B. and Luks, A.M. (2021). West’s Pulmonary Pathophysiology. Lippincott Williams & Wilkins.