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submitted by praderwilli(68),
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'saWnt sure atuob ciiestR,kta tbu I wken ironb of sxoedi swa no his elctryci ni teh sathntero nad igtngte urtedrot yb het pamvier bba.es

mimi21  LMFAO facts ! +11  


submitted by docred123(6),
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iH ugys cna meonose spaeel atbearleo on esthe iisn.ngdf I uddernntas hse sha nulg ancrce tths'a igpmnied hre acehtar. utB who is tish aevripnteseter of na itsturcebvo ?drsroeid trneA' glun nacesrc rriscteetiv fi igyntnha? knT ahs

nlkrueger  I agree that it's confusing but I looked at it as a physical *obstruction* since it's impinging on the airway.... but yeah idk this is weird +  
ferrero  Doesn't the trachea have cartilage rings so it wouldn't collapse which makes it seem less like a typical obstructive disorder? I'm really not sure why FVC would change because I don't see how total lung capacity or residual volume would change because those are static conditions where there is no airflow at all. I understand FEV1, peak expiratory flow, peak inspiratory flow etc. +2  
mousie  Agree this is a really tough Q but I also think I really over thought it... I eliminated all with a normal Ratio bc something obstructing would obviously produce an obstructive pattern although I don't know why FVC would be decreased. I wasn't sure about both peak expiratory and inspiration flow being decreased can someone help me with this or tell me I'm totally overthinking again.. are they both decreased simply bc theres an obstruction ..? +4  
mimi21  Yea I got confused on this question. But I guess they wanted us to look at it as a obstructive disease . If this were the case all of those function tests would dec. ( See FA ) +  
gh889  Because the obstruction is above the alveolar regions there is a decrease in air flow, not lung volumes, which would make this an obstructive pathology. +3  
charcot_bouchard  FVC here dec same way it dec in Obstructive lung disease. Read the concept of Equal pressure point of BnB. There he says in bronchitis we have onstructive pattern because inflammed airways gen more resistance. so EPP comes early. I guess here due to tracheal narrowing pressure inc downstream. which collapses smaller airway. result in air trapping. +1  


submitted by welpdedelp(227),
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3*0 .105. ihknT oautb ti, tehre si x lofw itwh na yeonxg etinanccrnoot fo y--so to fidn out hte drleeyvi yuo utsj tmypillu hetm tgreoet.h

yotsubato  One of those questions too simple to believe its actually the right answer +29  
mimi21  Right, I was like this is too simple lol ! im not sure if this is also a good tip but I tend to look at the units they are asking for and double check my math to make sure I end up with them. +7  
osgood-schlatter  what equation is it exactly? +  
arcanumm  Literally did not even conceptualize this question, just looked at the units. +5  


submitted by sakbarh(5),
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Seh ahs nyma ilucavdarcasro ksir atocrfs nda elkyli sefrufde a eoksrt of the lbsraai tyrear asniguc kleodc in ym.drnsoe Adgroccin to FA siht acn ecasu a lseion at hte np,os ulelda,rm or wlore bdmaniri -- ohvrwee mylaniotlaac het irlsaba etrray unsr ghitr no pot fo the npos os ytproxmii stom kllyei aeksm it hte irght snera.w

mousie  The Boards and Beyond video of SC strokes was really helpful at explaining this if you are a video kind of person! +1  
yotsubato  What pushed me away from pons was "dysarthric speech" which implied she still could speak to some degree.... which made me pick medulla. +3  
mimi21  I think FA may be misleading. Primarily it will effect the Pons because that is where the majority of the Basilar Artery is located. and I guess it could effect the other locations? but everywhere I have looked Locked-in syndrome is an issue with the Pons. But someone please continue to clarify, cause I was a bit tripped up at first with this question +  
cbrodo  Although FA says it can be pons, medulla, or lower midbrain, "locked-in" syndrome generally arises from BL pons lesions. Another way you can rule out medulla and midbrain in this question is the ocular movement findings. Since the patient has impaired horizontal gaze BL, you can conclude that the Abducens nuclei are involved on both sides. The abducens nuclei are located in the pons. +42  
gh889  USMLE secrets also states that it is most commonly in the pons Bates states that locked-in syndrome preserves consciousness but these patients have limited speaking ability +