CVR 39 Flashcards
Haemodynamics
study of forces in circulation of the blood
Highest pressure recorded are
systolic
lowest pressures are
diastolic
pulse pressure is
systolic - diastolic
mean pressure is
diastolic + 1/3 pulse pressure
Applies to arteries but not left or right ventricles
absolute pressure in veins is an order of magnitude ______ than in major arteries.
lower
CVP central venous pressure is ___ in health
low
Complex wave forms of venous pressure are
A C V X Y
Why does CVP rise in heart failure
back pressure thoruh the lungs from left ventricular failure
What is flow Q
volume movement per time
BP over
CO * TPR
Reynolds number
the number where laminar turns to turbulent over 2000
LA is usually a ____ pressure chamber. If LVEDP is high or MA is chronic then LA ______.
low
enlarges
What is the main determinant of viscosity
haemocrit 3 times h20.
decreased RBC deacreases viscosity and chronic hypoxia like lung disease or altitude increases heart work in viscosity
When blood flow slows what forms in teh bloow
rouleaux
A disease that causes high plasma concentrations and thus changes viscosity
waldenstroms, macroglobulinimia, multiple myeloma
What is compliance
measure of distensibiliaty
As we age arterial compliance ______ and systemic blood pressure _____
reduces
increases
Where does all the blood live
4% in left heart 16% aorta and arteries 4% caps 64% in veins 4% right heart
Pressure greatest to least
V=_____
Q/A
Q = flow
A = total cross section area
How do we increase CO
increase HR
reduce ESV
increase EDV
