Exam (elaborations)
H371 Perfusion.
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Exam of 11 pages for the course Perfusion at Perfusion (H371 Perfusion.)
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H371 PerfusionWhat is Perfusion? - correct answer-flow of blood through arteries &
capillaries, delivering nutrients & 02 to cells & removing cellular waste
products
What is impaired perfusion?
What are the consequences of impaired perfusion?
-ultimately what can happen? - correct answer-impaired: cardiac output is
inadequate; not enough 02 blood reaching body tissues
if severe: shock;
ultimately (if untreated): cell death/injury
Which side of the heart has higher pressure?
lower? - correct answer-Right side- low pressure
Left side: higher pressure
Where does edema result from?
-what can reduces it? - correct answer-increase in hydrostatic pressure;
decrease colloid pressure
lymphatic system: collects excess interstitial fluid & protein; returns it to the
systemic circulation (reduces edema)
What is preload?
~increase preload?
, ~decreased preload? - correct answer-volume of blood in the ventricles before
end of diastole (b4 next contraction)
***amount of stretch applied to the ventricles at the end of diastole***
-determines the amount of stretch placed on myocarddial fibers
~increased: increased blood vol; hypervolemic ( heart has to work harder)
~decreased: decrease in stroke volume/Blood volume; diuretics; high fowlers
w/ legs dangling
What is Afterload?
~increased:
~decreased:
affected by: - correct answer-resistance left ventricle must overcome to
circulate blood
~increased: HTN, vasoconstriction of arteries & arterioles
~decreased: vasodilation of arteries/arterioles; decreased BP
Increase Afterload= increases cardiac workload
by---- degree of arteriolar constriction or dilation; blood viscosity & volume
What does systole mean?
What does diastole mean? - correct answer-systole: contraction of
myocardium= ejection of blood from ventricles
diastole: relaxation of the myocardium--> allows ventricles to fill
What is Cardiac output? - correct answer-amount of blood pumped by each
ventricle in 1 MIN
(CO= SV x HR)
What is Cardiax index? - correct answer-more precise measurement of the
efficiency of the pumping action of the heart (use bod surface area); way to
calculate CO
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