The definition of orthostasis and it's relation to the degree of blood loss - USMLE Forums
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Old 06-13-2010
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Stethoscope The definition of orthostasis and it's relation to the degree of blood loss

Orthostasis is defined as a rise in pulse rate of more than 10 beats per minute or a decline in systolic blood pressure of more than 20 mmHg when the patient changes position from supine to sitting or standing position.

If orthostasis is positive it means there's 20% blood volume loss.

Blood volume loss larger than this will be demonstrated by the usual tachycardia and hypotension at all position and with no need to demonstrate orthostasis.
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Old 06-13-2010
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i dont think so orthostasis is the normal physiological condition but i think you mean orthostatic changes which is pathological condition indicating significant hemodynamic instability which = at least 20% loss in total blood volume -- > mandates immediate IV volume expansion and prepartion for blood transfusion
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Old 06-13-2010
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Unhappy I did not ..

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Originally Posted by tomymajor View Post
i dont think so orthostasis is the normal physiological condition but i think you mean orthostatic changes which is pathological condition indicating significant hemodynamic instability which = at least 20% loss in total blood volume -- > mandates immediate IV volume expansion and prepartion for blood transfusion
I did not say it's a normal physiologic phenomenon!
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Old 06-15-2010
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I am sorry we want the benefit but I mean is really orthostasis is pathological term ?:sorry:
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