When I mentioned blood pressure issues I intentionally did not use high blood pressure as the example, it can just be a matter of the body not being able to compensate appropriately for changes in posture, that can happen with high, low or even normal resting blood pressures. The result is still too much pressure in the skull because of gravity and the body's inability to adapt to the changes in demand on the cardiovascular system when the body is inverted.

Mr. S., thanks for bringing that up. I'm glad it brought my attention to the needed clarification.