Explain the effects of posture (lying to standing up) on systolic and diastolic !
Question: Explain the effects of posture (lying to standing up) on systolic and diastolic pressure?
Answers:
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Orthostatic (postural) hypotension is an excessive fall in BP when an upright position is assumed. The consensus definition is a drop of > 20 mm Hg systolic, 10 mm Hg diastolic, or both. Symptoms of faintness, light-headedness, dizziness, confusion, or blurred vision occur within seconds to a few minutes of standing and resolve rapidly on lying down. Some patients experience falls, syncope or even generalized seizures. Exercise or a heavy meal may exacerbate symptoms. Most other associated symptoms and signs relate to the cause. Orthostatic hypotension is a manifestation of abnormal BP regulation due to various conditions, not a specific disorder.
When a human stands, approximately 750 mL of thoracic blood is abruptly trans-located downward.
http://en.wikipedia.org/wiki/Orthostatic…
http://en.wikipedia.org/wiki/Orthostatic…
http://www.merckmanuals.com/professional…
http://www.mayoclinic.com/health/orthost…
http://www.medicinenet.com/orthostatic_h…