What is Orthostatic hypotension and how is it caused?
Orthostatic hypotension is a drop in blood pressure which can occur when changing the body position to a vertical one – standing up or possibly sitting up after lying down. OH can cause one to feel faint, dizzy, lightheaded and on rare occasion even experience vertigo. (In my case things go to negative – black background/yellow images) If you are looking for a “which came first” it would be the venous pressure dropping because of gravity-induced blood pooling in the legs, which in turn causes a decreased cardiac output which then lowers the arterial pressure, you will find a solid explanation at Wikipedia in which it is further explained that the dizziness which the results is because there is decreased contracting (systolic pressure) and a decreased resting (diastolic) pressure. There is an overall drop in pressure and perfusion in the upper part of the body – head. In a person not on medications which might cause orthostatic hypotension, their recovery will should be fairly rapid whe
