hemodynamics Flashcards
(19 cards)
What is the pressure as the blood moves through the capillary beds?
15mmHg
Where is oxygen delivered to the tissues and waste removed?
Capillaries
Flow is defined as ______ at any given time.
The amount of liquid moving past a point
What is the normal pressure in the left ventricle?
120mmHg
What is the most powerful component of resistance?
Radius
What is the relationship between resistance and pressure? If pressure ____, resistance _____.
Increases, increases
T/F: Non-laminar flow = flow separation
True
T/F: Most stenosis occurs at the proximal ICA near the bifurcation?
True
T/F: Typically, a stenosis must narrow the diameter of the artery by at least 25% to increase the peak systolic velocity significantly.
False, 50%
Why are platelets associated with early stages of atherosclerosis?
healing property (coagulation); repair of the damaged intima.
T/F: Coronary flow is determined by the systolic level of arterial pressure.
False
T/F: There is a small pressure drop at bifurcation of normal vessels.
True
What type of flow pattern occurs at a bifurcation and/or flow divider?
Disturbed
at what percent of diameter reduction is a stenosis termed hemodynamically significant?
50%
Turbulence can create vessel vibrations called?
Bruits
Turbulent flow occurs _______ the stenosis, laminar flow resumes _______?
Beyond, distally
The turbulent velocity pattern typically has what appearance?
Feathered
laminar flow disrupted at the end of the tightest point of a stenosis is called?
Spectral broadening
What is the dimensionless number used to predict when turbulence will occur?
Reynolds number
