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Old 12-08-2013
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Vascular Postural Cardiovascular Physiologic Changes!

when person stands from lying position what change will you observe in


central venous pressure

pressure gradiant

venous return
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Old 12-08-2013
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Immediate changes :
VR = decreases (gravitational effect-pooling in legs)
CO = unchanged so CVP = decreases too.
Gradient = increases (since CO is same and VR had fallen).
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Old 12-08-2013
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and what about after effects of gravity ?
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Old 12-08-2013
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and before any compensation co decreases I guess
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Old 12-08-2013
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without any compensation

vr decreses

co decreses

pressure gradiant decreases as pressure gradiant is propotional to vr

cvp decreases

correct me if I am wrong
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Old 12-08-2013
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Quote:
Originally Posted by sa255255 View Post
without any compensation

vr decreses

co decreses

pressure gradiant decreases as pressure gradiant is propotional to vr

cvp decreases

correct me if I am wrong

I think pressure gradient increases
The rest I agree.
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Old 12-08-2013
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  1. Gravity: The effects of gravity on venous return seem paradoxical because when a person stands up hydrostatic forces cause the right atrial pressure to decrease and the venous pressure in the dependent limbs to increase. This increases the pressure gradient for venous return from the dependent limbs to the right atrium; however, venous return actually decreases. The reason for this is when a person initially stands, cardiac output and arterial pressure decrease (because right atrial pressure falls). The flow through the entire systemic circulation falls because arterial pressure falls more than right atrial pressure; therefore the pressure gradient driving flow throughout the entire circulatory system is decreased.
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