Heller Ch. 8 Flashcards
What is circulatory filling pressure?
The pressure that would exist in the absence of flow
What keeps the venous pressure close to circulatory filling pressure?
Compliance
What is peripheral blood returning to the central venous compartment called?
Venous return
What is the cardiac output from a venous perspective?
Rate blood leaves the central venous compartment for the right ventricle
What determines venous return?
Pressure difference between peripheral and central compartments
The small resistance associated with the peripheral veins
What limits the venous return?
A central pressure lower than the intrathoracic pressure causes the veins to compress
What is the slope in a venous return curve?
The vascular resistance
What determines peripheral venous pressure?
Circulating blood volume
Sympathetic vasoconstrictors
Outside compression
Think about the Cardiac Function Curve/Venous Function Curve graph.
Seriously…think about it
What is one cause of abnormally high central venous pressure?
CHF
Why is the central venous pressure high with CHF?
Dysfunctional heart muscle (depressed cardiac function)
Excessive fluid volume (right-shifted venous function)
What are the implications of low central venous pressure?
Elevated cardiac function; OR
Left-shifted venous function curve
What can cause low central venous pressure?
Low blood volume
Lack of venous tone
What is a non-invasive method of determining symptomatic central venous pressure?
JVD
What is a more specific method of determining central venous pressure?
Catheter–near right atrium or pulmonary wedge pressure
