keepgoing
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A 7-year-old boy tires easily while running.On auscultation, a harsh continuous murmur is heard at the left of the sternum between the first two ribs. Arterial blood oxygen content is slightly higher in the right hand than in the left hand. X-ray films of the chest show no abnormalities. Which of the following is the most likely diagnosis?
(A) Anomalous return of pulmonary blood to the right atrium
(B) Patent ductus arteriosus
(C) Patent foramen ovale
(D) Stenosis of the aortic valve
(E) Tricuspid atresia
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| indidoc1
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B?
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"Whether you think you can or whether you think you can't, you're right!" ~ Henry Ford
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| oldkidontheblock
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C
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Malcolm Forbes: Victory is sweetest when you've known defeat
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| silver
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B
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Everything turns out ok in the end. If it's not ok, then it's not the end.
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| new_n_lost
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(B) Patent ductus arteriosus For Sure
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| Luckyall
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PDAAAAAAAAAA 
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| mytime
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| ShweHope99.9998
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BBBBBBBBBBBBBBBBB
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| epica
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Noooooo
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| new_n_lost
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S4
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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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| mytime
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YAAAAAAAAA I thot so too. 
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| new_n_lost
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Splanchic Dec
Coronary Inc
Pulmonary REmains the Same
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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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| new_n_lost
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I Sincerely hope i got the question right the first time.
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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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| Luckyall
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nice challenge Epica... 1 suggestion though... do create a new topic to review things, this way one can easily click directly on that one and not accidentally find it ( as in my case)  Lets see
Coronary circ already consumes lots of O2 under N cond---> AV diff is high
Renal& splanch. b c is overperfused---> high venous Po2---> low AV diff
Pulm is a very compliant circuit therefore an incr in Press--> vessel dilation---> so i think there is not much of press differences during exercise versus N conditions---> about 10 mm Hg ---> low AV diff
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| new_n_lost
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True
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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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| epica
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Please think again about A-V Po2Q
You know this
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| epica
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Ok will explain in few minutes.
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| epica
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1. Splanchic circulation will constrict--- blood flow to tissue will decreased---tissue need now O2---will be extract of oxygen from the blood --- decreased venous po2 -----INCREASED A-V PO2 AS A RESULT
try to explain another two
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| Luckyall
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for coronary circ.. the extraction is already MAX under N cond---> therefore no increse VERSUS N resting cond.. depends how you word the Qs... i answered it( increased) as if there was no comparission to N sit.
Splanchnic--> low AV diff. resting and exercise as well
Pulmonary.... since is a very very compl circuit... why would this differe in exercise ???
in exercise pumping more blood is successfully adjust it by compliance nature.... yes , the extraction might increase, but no much press differences from N sit...
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| epica
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Good review, thanks.
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| Luckyall
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actually in Splanchnic& renal arteriolar Resistance INCREASES DURING EXERCISE---> so less blood flowing in , now these tissues starve O2 therefore more O2 extraction from the blood itself----> higher AV difference.. agree on this one
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| epica
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Yes, because of constriction in Splanchic, clear now
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| new_n_lost
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Man I totally Missed this Q took it along the lines of Blood Flow
Good Review
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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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| mytime
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GUys, this is getting confusing ! What are we talking about ,now?! 
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| keepgoing
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hey good questions epica ...thanks!
guys for the very 1st question i posted ans is b and u all did so well..so words
epica this is good way to review topics..post in new thread 'n' let everyone explore concepts....
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