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25 Cards in this Set

  • Front
  • Back
What is hemodynamics?
The study of physical principles of blood circulation.
What is blood?
A vicous fluid made of cells and plasma
What are RBC's?
The major component of blood
Biconcave disks
7um in diameter
Give signal to doppler
What is viscosity?
The thickness of blood.
The thicker the blood (more RBC's) the more viscous it is.
Anemia=low RBC=low viscosity
How blood moves through the vessels:
Blood flows to path of least resistance
Pressure is applied to a vessel
Blood is propelled through the vessel by a pressure drop
What does resistance determine and what changes it?
How and where blood flows
Changed by viscosity, vessel lumen radius, frictional effects
What is laminar flow?
When blood flows in layers
The center stream is always the highest velocity in this flow.
What is volume flow rate?
The amount of blood flowing through a vessel per unit of time
Too fast=stenosis
Too slow=blockage
Two biggest components to Poiseulle's equation:
*Small radius changes make a difference (x4) in volume flow
*Volume flow is altered by pressure differences along the length of a vessel
Poiseulle's concepts
Inverse relationship (change increases, flow rate increases, radius doesn't)

Vessel length I, volume flow rate D
Viscosity I, volume flow rate D
Static filling pressure
When vessels fill, the walls expand. When the vessel returns to its orginal shape, this pressure is called _________.
What is hydrostatic pressure?
The weight of fluid in a column/the weight of blood when standing due to gravity.
In general circulation, what is considered the reference point, or 0 hydrostatic pressure?
The atrium
Anything above the reference point is _________
Anything below is a _________ pressure shift
What is ABI?
Bernoulli's principle states that total fluid energy consists of:
Kinetic energy, potential energy, and work done when pressure is applied.
What does Bernoulli's predict?
Pressure drops greatly across a stenosis as a reults of energy loss on the post stenotic region.
What is pulsatile flow?
Blood flow that reflects the phases of the heartbeat
Used in arterial flow only
What is systole?
Forward flow sent through the peripheral system
What is early diastole?
Area of tempory flow reversal
What is late diastole?
The forward flow reflective wave hits the proximal resistance to the next oncoming wave and then reverses.
What is intraluminal pressure?
Pressure exterted on the walls from the fluid within blood
What is tissue pressure?
Pressure exterted on the vessel from outside structures
What is transluminal pressure?
The difference between the intraluminal and tissue pressure, or the pressure on the wall itself
When does turbulence occur?
After Revnolds number