hemodynamics (heximer) Flashcards
what determines pressure generation in heart (laplace)
stress (force/area)*thickness of wall/radius
what are 2 main diffs between R and L vents.
L has smaller r and thicker walls
what factors does heart try to keep fixed
wall pressure
what happens @ beginning of systole
AV valve closes
what occurs after AV closes
isovolumic contraction
what ends isovolumic contraction
aortic valve opens
what ends isovolumic relaxation
AV valve closes
what does a PV loop measure
LV volume vs. pressure
what is ESV and where on loop
end systolic vol - least V, most P
what is EDV and where on loop
end distolic vol. - least P, most V
when does mitral valve open
low P, low, V
when does filling occur
between mitral opening and closing (EDV)
what is stroke vol calculation
EDV-ESV
what changes P-V loops
pre and pos load
what is ESPVR a measure of
heart function (contractility)
