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Old 02-18-2012
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Vascular Mean Systemic Pressure VR-RAP graphs

Does anyone know why both arterioloconstrictors and arteriolodilators do not affect the Mean Systemic Pressure? (I am talking about the Venous return against the Right Atrial pressure graph in this case)

In the Venous return against the Right Atrial pressure graphs, the use of venoconstrictors will increase MSP whereas venodilators decrease the MSP.

please see attachment. TQ.

Mean Systemic Pressure VR-RAP graphs-prev14.png
click image to enlarge
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aungawa (08-23-2012), USMLEisnoteasy (02-19-2012)



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Old 02-19-2012
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I found a great article on the net that explains how the Venous Return/Cardiac Output against RAP curves change in many conditions like:

Effectiveness of heart (cardiac performance):
Increased symp tone
Inotropics
MI, Valvular diseases, Cardiomyopathies

Variables affecting MSFP:
blood volumes (dehydration, fluid overload RAA mech, hemorrhage, infusions)
vascular container size (sympathetic tone, venoconstrictors/dilators)

Variables affecting resistance to venous return:
Viscosity
AV shunts
vasomotor tone

And also effects of spinal anesthesia , exercise, fluid overload with vasodilation... To all those who stumbled across here, hope this attached article helps...
Attached Files
File Type: pdf Cardiac Output Venous Return Curves.pdf (164.0 KB)
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Old 02-19-2012
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Thank you for the nice article but Sabio explained it in a very shorter article that 's all you need to know for the USMLE, here's the link
Cardiac Output - Venous Return Curves
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Cardiovascular-, Figures-, PDF-Attachments, Pharmacology-, Physiology-

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