Orthostatic hypotension is said to be present, if systolic blood pressure falls by_____while assuming standing posture from sitting posture.
Correct Answer: >20 mm Hg
Description: Orthostatic hypotension is defined by a fall in systolic pressure > 20 mmHg or in diastolic pressure > 10 mmHg in response to assumption of the upright posture from a supine position within 3 min. There may also be a lack of a compensatory tachycardia, an abnormal response that suggests autonomic insufficiency, as may be seen in patients with diabetes or Parkinson's disease. Orthostatic hypotension is a common cause of postural lightheadedness/syncope and should be assessed routinely in patients for whom this diagnosis might pertain.
Reference: : Harrison’s medicine page no 126
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