- Joined
- Sep 8, 2015
- Messages
- 283
- Reaction score
- 334
Hello to everyone,
I did another uworld q on CV physiology this time and it drives me nuts.. The q specifically said on the response that an acute fistula AV does not shift the venous return curve to the right .. Wont an acute AV fistula cause a drop in TPR and thus BP --> Activation of sympathetic system --> Increased venous tone and thus reduced compliance --> Increased MSFP ( via the Blood Volume/Venous Compliance equation ) ---> Shift of curve to right???
The explanation said that only the RAAS system can move the curve to the right by increasing the blood volume. Sure thats true , but in my understanding there should be a slight shift just by the venoconstriction , and then a Further definitive shift by the increased volume..
Maybe i am just overthinking this and acute means without any compensation , but isnt the sympathetic response on heart/vessels like ... Instant?? Any explanation will be very welcome...
I did another uworld q on CV physiology this time and it drives me nuts.. The q specifically said on the response that an acute fistula AV does not shift the venous return curve to the right .. Wont an acute AV fistula cause a drop in TPR and thus BP --> Activation of sympathetic system --> Increased venous tone and thus reduced compliance --> Increased MSFP ( via the Blood Volume/Venous Compliance equation ) ---> Shift of curve to right???
The explanation said that only the RAAS system can move the curve to the right by increasing the blood volume. Sure thats true , but in my understanding there should be a slight shift just by the venoconstriction , and then a Further definitive shift by the increased volume..
Maybe i am just overthinking this and acute means without any compensation , but isnt the sympathetic response on heart/vessels like ... Instant?? Any explanation will be very welcome...
Last edited:
