goodies
Forum Junior
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Does squatting increase or decrease venous return? Squatting increases TPR and helps out during Tet spells (Tetralogy of Fallot) by increasing systemic pressure to impede emptying of left ventricle (so as to briefly reverse the R-L shunt of tetralogy of fallot), but my question is...
what is the effect of squatting on venous return? i have read conflicting sources on this.
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| new_n_lost
Forum Hero
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i think there is a similar topic on the Physiology or Pathology forum u can search it if u want the concept is pretty well explained over there.
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| Luckyall
Forum Guru
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if you found it... why dont you post it ? just curious 
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| Addicudo
Forum Guru
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SQUATTING .. !!
Sitting with your legs flexed .. !! Right ..
More PRESSURE on the venous system of the legs .. .transmitted up to the IVC .. Then .. Increased pressure of the IVC to the RIght Atria and Vent .. therefore ... Giving it a RIGHT - LEFT Shunt .. !!!
NOW .. pts with TOF SQUAT and benifit most from it .. in TOF .. there is Left - Right shunt .. and Squatting kinda balances it by the Right - Left shunt .. !!
Thats what I know about Squatting .. !
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| goodies
Forum Junior
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how does squatting affect venous return? because squatting increases TPR and usually increased TPR decreases venous return... so that would mean squatting decreases venous return???
i did a search and could not find it.
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| goodies
Forum Junior
Topics: 19
Posts: 39
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addicudo, isn't it R to L shunt with tetralogy of fallot... not L to R. that is why they are always cyanotic. squatting balances it by making it L to R.
but anyway, i don't get how squatting affects venous return. please explain!
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| tompat
Forum Elite
Topics: 39
Posts: 345
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hmm, squating reduces venous return.
it increases systemic vascular resistance.
it's simple sqatting will press on both veins and arteries, so more force required to negotiat arterial blood to move forward and more force required for venous blood to move back to heart, so the return decreases.
give morphine to reduce the hyperventilation drive, and decrease the venous return.
phenylephrin for increasing vascular resistance.
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| d
Forum Newbie
Topics: 1
Posts: 19
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http://www.prep4usmle.com/forum/thread/27839
This is the thread I found on Googling. It basically explaings Squatting and Valsalva are opposite effect activities. Squating increases venous return and valsalva decreases it.
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| tompat
Forum Elite
Topics: 39
Posts: 345
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yah man i just found some cardiology websites mentioning squating increases venous return!!!
thanks d.
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| tompat
Forum Elite
Topics: 39
Posts: 345
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guys can any one tell if there is any diff bet knee chest position and squatting.
i guess there is no hysiological diff bet them as far as venous return is concern.
i think this is very imp. topic please let me know if i m wrong.
this will help us in step2 also
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| d
Forum Newbie
Topics: 1
Posts: 19
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tompat i think knee chest is what is referred as squating.
I have another doubt - the conflicting views about squat
ARE THEY BCOZ SOME STUDIES HAVE NOTICED CHANGE IN HEMODYNAMICS ON SQUATING AFTER STANDING AND OTHERS AFTER LYING DOWN?
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| tompat
Forum Elite
Topics: 39
Posts: 345
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know what what i said above , squat reduces venous return, cuz in tet spells of TOF they make kid squat or if he is quite young give him knee chest position.
it's been said that this positon cuzes decreased return to heart and also increases systemic vascular resistance. so the right to left shunt which cuzes cynosis is reverted and made into left to right.
but on uni of californid web site i read the oposite , where they mention squating cuzes increased venous return.
keep searching man.
me too will be.
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