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When a person changes position from lying down to standing, the blood pressure in the veins of the lower limbs increases.
What happens to BP immediately upon standing from a supine position?
The arterial blood pressure drops when one moves from supine to standing. Orthostatic hypotension is defined as a drop in systolic blood pressure (SBP) of at least 20 mm Hg or a drop in diastolic blood pressure (DBP) of at least 10 mm Hg within 3 minutes after standing.
When a person's blood pressure suddenly drops because of a change in position, it is known as orthostatic hypotension. Gravity affects the vascular system after standing up from a sitting position or from a laying position, reducing the amount of blood returning to the heart and causing blood to pool in the leg.
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