quansar
Forum Newbie
Topics: 6
Posts: 26
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can anybody explain the plot ?? I thought the solid line is already for maximal dilation thus anything above it should not be possible.
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| me007
Forum Guru
Topics: 72
Posts: 799
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what number nbme it is?
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| quansar
Forum Newbie
Topics: 6
Posts: 26
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or sorry I missed the 4 in the title. it is form4
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| Luckyall
Forum Guru
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we had a big discussion on this Qs posted by laura81 i guess... look for it , i think it was about 5-6 weeks back 
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| Luckyall
Forum Guru
Topics: 11
Posts: 592
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answer is x--------> z
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| quansar
Forum Newbie
Topics: 6
Posts: 26
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I found the post.
But still I do not think I got it. Luckyall, it seems you know well of this topic. may I ask couple more question:
1. what does perfusion pressure mean in this q, is that diastolic blood pressure??? at starting point X, the perfusion pressure seems quite low, < 60 mmHg, which can not be a normal diastolic pressure. correct??
2. In the q stem it says the solid line represents maximal dilation, then at Z, the diameter of the vessel should still be the same, right???
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| quansar
Forum Newbie
Topics: 6
Posts: 26
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I wonder why X is the point for resting state heart?? is it true that at resting state the coronary blood vessel is maximally dilated??
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| me007
Forum Guru
Topics: 72
Posts: 799
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the only resonable choices x-z or x-y (lowest possible perfusion pressure at start)
blood flow will incr more bcs of local factors - hypoxia and adenosine
perfusion pressure not incr as much bcs of tachicardia
so, c.
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| quansar
Forum Newbie
Topics: 6
Posts: 26
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THANK, I think I am getting it
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| lq2006
Forum Elite
Topics: 43
Posts: 382
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X----->Z
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| pr20
Forum Senior
Topics: 24
Posts: 180
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could it not be Y----W.
x cannot be the starting point as it indicates a maximally dilated heart at rest.
Z cannot be possible as it is more than the highest blood flow for the given perfusion pressure at maximal dilation.
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