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Venous pressure changes

In 1-G, as the head moves from standing to supine:

In microgravity:

Vertebral system is in minimal flow

Internal jugular system is in maximal obstruction



Remember the flow changes in Valdueza’s chart.

In microgravity, the vertebral venous system acts the same as in a supine position in 1-G.

The IJ, however, remains in Zone I compression as in a standing position in 1-G, but it also loses the hydrostatic gravitational gradient.

Maximum obstruction, minimal flow in microgravity- the worst of each flow characteristic found in 1-G along with the loss of the gravitational gradient.