Doppler Flashcards
Bloiod that flows with variable changes with the cardiac cycle in arterial circulation
Pulsatile flow
The speed of something in a given direction
Velocity
When blood moves with a varying velocity
Phasic flow
occurs when the fluid moves at a constant speed or velocity
Steady Flow
Layers of fluid are straight and parallel to each other, the slide over eachother. The highest flow is at the center vessel
Laminar flow
Flow with all fluid portions traveling with the same flow speed and direction
Plug flow
Laminar flow with a profile shape of a bullet, middle layer travels faster
Parabolic flow
Random and chaotic flow pattern
Turbulent flow
Blowing, swishing sound indicating blood flow turbulence or atherosclerotic narrowing
Bruit
A thrill is considered a palpable cardiac murmer. feels like the throat of purring cat
Thrill
Predicts whether flow is laminar or turbulent
Reynolds Number
Total fluid energy at one location differs from the total fluid energy at another location
Energy Gradient
Energy that a body possesses by virtue of being in motion
Kinetic energy
Pressure is defined as force per unit area
Pressure (energy)
Potential energy associated with the gravitational feild
Gravitational energy
V = friction existing between contiguous layers of fluid F = of or produced by the action of one surface or object rubbing against or moving over another I= Mass is an objects resistance to acceleration or flow
Energy loss in circulation (frictional, Viscous, Inertial stenosis)
Produces disturbed or turbulent flow
Effects of stenosis
Fluid moves against a pressure gradient from a point of low pressure to a point of high pressure
Bernoulli’s princeple
Fluid in a tube flows in response to a pressure difference at both ends
Pressure flow relationship
The voltage in a circuit equals the product of current and the resistance
Ohm’s law
The pressure that the fluid exerts on the walls of it container
Hydrostatic pressure
Inspiration = diaphragm contracts expands greater volume Expiration = passive relaxation rib sternum back in regular position
Venous and breathing flow
Go from one place to another in a steady stream
Flow
Narrowing of a vessel lumen produces disturbed or turbulent flow
Stenosis
