mjl1717
Forum Hero
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Posts: 5,465
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I go with -b
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Smell the coffee! "Is That an Osler move??"
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| aahy1978
Forum Junior
Topics: 11
Posts: 39
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dear mjl1717,
The answer is D ? according to PreTest for Physiology (10th Ed)
Central venous pressure is the hydrostatic pressure in the great veins at their entrance to the right atrium. Increasing venous compliance would decrease pressure in the venous vessels and therefore would decrease central venous pressure. Decreasing blood volume woud have the same effect. Reducing the plasma concentration of aldosterone would result in a decrease in blood volume. Increasing TPR would tend to shift volume from the venous side of the circulation to the arterial side, resulting in a decrease in venous pressure. Increasing cardiac output tends to lower central venous pressure, whereas lowering the cardiac output tends to increase central venous pressure. A reduction in heart rate would tend to lower cardiac output and therefore increase central venous pressure. (Guyton, pp 215-220)
? I had a hard time getting this earlier with goljan as well... he said Decreasing TPR arrow Increase Venous Return shock
is it better just to look at it as left and right side... if u decrease TPR, so more blood will pool in the veins arrow more blood in vein arrow more blood back to right heart
so, does the opposit work too... lets see increase TPR arrow x ...hmm..i think i'm stuck (
anyway, maybe u can make it easier for me... could u pls just make a relationship between increase TPR to venous return too??
thank you very much for all ur help D
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| ssrpk
Forum Fanatic
Topics: 154
Posts: 2,819
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hey there,
it's just a trick....think thru it :shock:
"increasing a point resistance in a vessel wud decrease the flow as well as the pressure downstream ; however upstream the flow wud also decrease but here the pressure increases - bcoz of more resistance"
now let's talk it systematically.....increasing TPR would reduce the pressure as well as the blood flow through the veins while incresing systemic arterial pressure depite reduced blood flow through the arteries.
simply learn,
"DOWNSTREAM PRESSURE AND FLOW MOVES IN SAME DIRECTION WHILE UPSTREAM THEY ALWAYS MOVE IN OPPOSITE DIRECTION"
hopefully it will make it easier to apply.. :|
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| docsk
Forum Junior
Topics: 12
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wow...its very counterinuitive but thank you for the discussion...i too will look into it.
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| aahy1978
Forum Junior
Topics: 11
Posts: 39
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hey ssrpk,
yeah, i think what u said makes it easier for me... need to think of the FLOW component as well D
thanx for detailed explanation D D
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| abu albara
Forum Newbie
Topics: 0
Posts: 4
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i am with aahy
aahy, your explanation is very logic
thank you for your explanation
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