Card Set Information
Hemodynamic questions from Strandness
What are the three components of Intravascular pressure?
1- dynamic pressure produced by cardiac contraction
2- hydrostatic pressure
3- static filling pressure
What is the equation for hydrostatic pressure?
P= - (density x g x h)
What can energy loss occur from?
Viscosity or interia changes
Poiseuille's simplfied equation:
R = (8Ln / Pi r^4)
Aprox. 90% of total vascular resistance results from what?
flow through the arteries and capillaries
What is a boundary layer?
The portion of fluid flowing through a tube that is adjacent to the tube wall.
When does flow separation occur?
when tube geometry changes ( curvatures, change in pressure gradient, ect)
What is the average blood flow in a normal leg?
300- 500 mmHg
Between the radius of a stenosis and the length of a stenosis, which has a greater effect on viscous energy loss?
Radius of a stenosis