young_doc
Forum Guru
Topics: 55
Posts: 732
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Hey everyone, sorry about the leave of absence from this website! My exam is next week!!!!
Maybe i can give an analogy to help prove my point:
Imagine a one-way-opening door. After it opens, imagine you have 100 big guys that want to close the door shut. Are you telling me that this will "delay the closing of the valve"??? I beg to differ, the valve will close even faster with all the pressure behind it pushing against it.
So an increase in Right Ventricular Afterload cannot possibly delay the closing of the valve! If anything it will make it close even faster.
REMEMBER EVERYONE, VALVES OPEN AND CLOSE DUE TO PRESSURE CHANGES between the chambers behind and on front of the valves. If the pressure is greater behind the pulmonary valve (increased afterload), then it will close. If the pressure is LESS behind the pulmonary valve (decreased afterload), then it will remain open, and hence the S2 split.
(Thanks to all the believers though! DrpKAUR, ImmuDOC...) =)
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| young_doc
Forum Guru
Topics: 55
Posts: 732
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Manu Nastai, if i may rebut, in your explanation for why the answer is D...you don't really explain why the answer is D!!!
Your explanation tells us that inspiration increased PRELOAD, which is absolutely true (as i've said in a previous post). But answer 'D' says increased AFTERLOAD!
Also i was under the impression that the answer is OFFICIALLY "C" (whether people agreed with my explanation or not)....since the person who put up the Question also put up the Answer!!!!!!!!!!!!!!!
Alright back to studying. Keep an eye out for a post from me in the "Exam experiences" part sooooon.
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| ManuNastai
Transilvanian..
Topics: 55
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I just saw that dpk.. has put the answer! OK, now I believe it even if my explination sounds better to me! Well, everyone could be wrong.. even me. 
I was trying to say that the delay is caused by the increased output due to frank - starling efect! it doesn't matter any more now... it seems that the answer is C
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| eytanraz
Forum Newbie
Topics: 1
Posts: 68
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I' d like to quote from Costanzo second edition, page 139 just to eliminate any doubt.
"Inspiration delays closure of the pulmonic valve and causes splitting of the second heart sound; that is , during inspiration, the pulmonic valve closes distinctly before (I think here Linda costanzo wanted to say "after"!) the aortic valve. Splitting occurs during inspiration because the associated decrease in intrathoracic pressure produces an increase in venous return to the right side of the heart. the resulting increase in right ventricular end diastolic volume causes an increase in righ ventricular stroke volume by the frank starling mechanism and prolongs right ventricular ejection time; the prolongation of ejection time delays closure of the pulmonic valve relative to the aortic valve."
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| vallia
Forum Guru
Topics: 98
Posts: 889
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yes it's c, decrease afterload.
good luck young_doc
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| Luckyall
Forum Guru
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Good luckkkkkkkkkk , young_doc !!! 
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| Luckyall
Forum Guru
Topics: 11
Posts: 592
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It looks like you have strong concepts ! Do let us know your st 1 vision !
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| young_doc
Forum Guru
Topics: 55
Posts: 732
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Thanks everyone! Just 7 more day 
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