Circulatory Physiology in AV Fistula! - USMLE Forums
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  #1  
Old 10-07-2011
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Vascular Circulatory Physiology in AV Fistula!

A 60 year old man develops acquired Arteriovenous fistula, which of the following will be noticed in blood work up?

Total peripheral resistance, Cardiac output, Pulse pressure
A) Decreased, Decreased, Decreased
B) Increased, Increased, Increased
C) Decreased, Decreased Increased
D) Decreased, Increased, Increased
E) Increased, Decreased, Decreased
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  #2  
Old 10-07-2011
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a guess b but no clue'
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Old 10-07-2011
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Av fistulae decrease TPR and increase C.o and increase pulse pressure
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  #4  
Old 10-07-2011
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D. plz post the right answer & the source of the Q, thanx
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Old 10-07-2011
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Maybe E.

Akua
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Old 10-07-2011
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d) high output failure
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Old 10-07-2011
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TPR will be decreased since its a fistula...easy way to the vein.
Cardiac output will be increased due to increased venous return.
And pulse pressure will increase because of decreased TPR.
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  #8  
Old 10-08-2011
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Quote:
Originally Posted by trendsetter View Post
TPR will be decreased since its a fistula...easy way to the vein.
Cardiac output will be increased due to increased venous return.
And pulse pressure will increase because of decreased TPR.
yes but there will be more blood going to the heart as well, means heart will have to pump more blood out which will inc TPR, INC CO AND INC PP
SO MY ans is DDDDDDDD
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Old 10-08-2011
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AV fistula decreases total peripheral resistance as it creates a sort of bypass for blood... cardiac output is increased n so is pulse pressure.. option D
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  #10  
Old 10-08-2011
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Correct Answer

Answer is D Good job guys!
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