intro to heart failure Flashcards
define heart failure
heart is unable to supply adequate blood flow to peripheral tissues
->
inadequate O2 supply to tissues = hypoxia
heart failure is associated with _____ CO, _____ MAP
decreased CO
decreased MAP
2 equations for MAP
MAP = HR x SV x TPR
MAP = CO x TPR
why does frank-starling curve shift downward w decreased contractility
less volume ejected during systole
SV decreases
draw pressure-volume loop
how does increasing preload change pressure-volume loop
widens loop to right
how does increasing afterload change pressure-volume loop
increases loop height
how does increasing inotropy change pressure-volume loop
widens loop to left
&
steepens ESPVR curve
how does systolic dysfunction change pressure-volume loop
loop shifts down & right
increases ESV
increases EDV
decreases SV
decreases ESPVR slope
how does diastolic dysfunction change pressure-volume loop
loop shifts up
decreases ESV
decreases SV
