new_n_lost
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A) Aorta ?? Looks lie a tricky one so maybe this is the answer.
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| dncosta
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A, definitely.
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| Luckyall
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mmm highest BP ? 
i hope you dont ask highest absolute Pressure ( upright indiv) bc that would be Renal Art.
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| RayBerg
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Renal A is correct
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| new_n_lost
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Dude Ok This Not COOL plz either post the Complete Q or atleast which is complete and secondly post the explanations also !!!!  
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| Luckyall
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the Qs asked ( tricky way of asking) where is highest absolute P in an upright indiv?
furthest artery below heart level would do it all the time  , due to adding approx +80 mm Hg Gravity Press
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| new_n_lost
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it doesnt Cut it Sorry Need the Original Explanation cos from wht u r telling me is that pressure is the highest in the Renal Art. Due to Gravity then Aorta will still have the Highest Pressures cos the Aorta gives off Renal Arteries n then continues downwards so therefore having more pressure and furthermore the Renal Artery lies horizontially in the abdomen so the Gravitational Effect is gonna be more across the length of the artery???
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FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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| dncosta
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Strange... It would not be possible to have blood flowing from a lower pressure territory (aorta) to a higher pressure bed (renal artery, as posted by RayBerg). This would not be physically possible since both vessels are freely comunicating.
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| RayBerg
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I just got this q from a thread on p33. I just changed one of the answer choices from Renal Vein to SVC
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| RayBerg
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Luckyall wrote:the Qs asked ( tricky way of asking) where is highest absolute P in an upright indiv? furthest artery below heart level would do it all the time , due to adding approx +80 mm Hg Gravity Press
OMG...I just figured out what concept they were testing here.
In that case it makes sense!!! But what if the question had Renal V and Renal A as its answer choices (like the original q where I got this from). What would be the answer be then? Everyone picked Renal A, but I can't reason it b/c technically the effect of gravity on Renal V and Renal A should be the same. Right?
So, if the answer choices had everything mentioned above and Femoral A,
you should pick Femoral A.
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| me007
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there is nothing about upright position in the stem of qs.
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| me007
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wouldn't it be Poiseuille's equation Resistanse equal 1/r4
and than pressure = cardiac output x resistance?
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| RayBerg
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me007 wrote:
there is nothing about upright position in the stem of qs.
I'm sorry that the q is poorly worded. I got it from a different thread. I didn't modify the q at all..just 1 answer choice.
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| Luckyall
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me007 wrote:
there is nothing about upright position in the stem of qs.
I read somewhere, or i got it from when i listened to Dunn's lectures few months back that you should assume pt is atleast standing if not upright ( and not supine) unless they mention otherwise!The highest absolute Press. of blood in a vessel in an upright indiv is not Aorta, bc there( Ao) is only 100mmHg... it will be in an artery below heart level. Agree, tricky way of asking, but i found other Qs same format, they wanted same thing 
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| dncosta
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And doesn't aorta courses below the heart level?
If that theory of gravity difference in absolut pressure is true, the question should have mentioned ascending aorta.
If the gravity theory is considered, then the distal abdominal aorta (infra-renal) would have higher BP than the renal arteries. It does not make sense to me. What do you think?
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| Luckyall
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guess what? look into Kaplan book itself, the 1st practice Qs under that particular topic DONT have Ascending Ao mentioned either, just Ao among options and is also a wrong option...
So, i guess this answered your Qs...
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| epica
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Where will be the highest blood flow?
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| me007
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i remember qs about jugular veins i physio q bank, gravity affects,
but i'm not sure in this case bcs vessels compared have different diameter,
they are arteries not veins, and both lie lower than heart,
also level of aorta not determined in this q - there is part of aorta below renal arteries, why don't compare that part?
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| RayBerg
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Okay guys..take it easy now. This is where I got the q from:
http://www.prep4usmle.com/forum/thread/7634
Another link helping w/ the question (I assume): http://sprojects.mmi.mcgill.ca/cardiophysio/ekghe...
Quoting Malaysian:
to those who are lazy in checking the site.....basically the formula is HR=1500/no.of small boxes between R-R waves
Apparently the Renal Artery or for that matter the other systemic arteries branching from below the aorta all have an increased BP above the aorta
because of some wave at their branching point from the aorta causing an increased BP.
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| Luckyall
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epica wrote:
To Lucky,
I appreciate your confidence but please look to the figure on page 90
Why Aorta here has the greatest pressure.?
So, it's very important to know in which position ( because of autoregulation)
Epica, i guess you didnt get the concept out of that page 90
There, the AO, is NOT mentioned to have the highest Press... read thru text itself, im not quoting it word by word... just bc is right there. Even more what AUTOREGULATION were you talking about in here ???????
But on that page, the Ao is not mentioned to have highest pressure, also look at the figure and understand it !
Hope this helps
Edited by Luckyall on 05/30/07 - 01:05 AM
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| epica
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Lucky, its LOGIC, also if u used new lectures from the center u would agree w me...
Reread and listen... to all of us
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| Luckyall
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I did listen to new lectures from center and i wrote above my thoughts... , i believe is Gravity that adds up Pressure on artery& veins below heart, and thas what they wanted out of this Qs,is clearly mentioned in kaplan, that figure i told ya to look at it tells ya---> there is an increse in Press from the heart level(100 mmmHg) downstream... after all, i did recheck it, there are no doubts for me.... i will actually be glad to interpret something wrong right now, bc i d wanna have that taken care of  , but i did recheck, no doubts for me as far this Qs's interpretation goes !
Just my thoughts, you are more then welcome to think differently,after all this is a free country,isnt it ?
Lets end this discussion, guys, is getting out of hands !
GL studying yall !
Edited by Luckyall on 05/30/07 - 01:01 AM
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| epica
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My conclusion------Kaplan is great
Good luck on your exam
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| new_n_lost
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Guys This question not worded correctly the Kaplan clearly says that Any Artery below the heart level will have a greater pressure due the effect of Gravity n they have given the Example of Femoral Artery as compared to Aorta where Femoral will have a greater pressure as compared to it.
Now in this Question Renal Artery is Mentioned and Aorta is Mentioned half of us assumed it was Ascending Aorta thus making the Renal Artey as the Correct Answer but the Other half ( Including myself ) Took it as the Descending Aorta Which Ends below the Renal Artery Thus MAking Aorta teh right Answer.
I Havent Looked into BRS and for those of u who have plz do enligten me as to y the BRS choose Renal Artery as the Answer over Aorta When its Mentioned in Ganong and Kaplan that any artery which is below the level of the heart will have the a Greater pressure in it due to the Effects of Gravity and the same goes for the Veins.
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FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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