30 RHF Flashcards
compare the stroke volume of the RV to the LV
compare the EF of the RV and LV
stroke volumes are the same
RV has a lower EF
RV starts with a larger volume so it can produce the same SV as the LV with a lower EF
why does the right ventricle have trouble with increases in pressure and volume
the right ventricle is relatively thin
Wall tension = pressure*radius/(2*wall thickness)
the less thick a wall is, the more senstitive it is to pressure/volume(radius) changes
what type of MI causes RV ischemia
which leads are going to have abnormalities?
inferior MI
aVF, II, III are the inferior leads
for inferior MIs causing RV failure, how is the patient managed
manage hypotension with fluids(only way to keep SV up)
add inotropes if fluids dont improve SV
describe management of acute RV failure NOT involving an inferior MI(different strategy)
diuretics are useful to prevent excessive filling of the RV and a detrimental effect on SV
inotropes(mirenon/dobutamine) can be used to maintain SV along with diuretics
symptoms of chronic RV failure
dsypnea, fatigue, lethargy
exertional syncope
anorexia
abdominal swelling, edema
cor pulmonale
subgroup of RV failure w/lung disease
- COPD, interstitial lung disease, etc
hypoxemia leads to constriction of vessels in that part of the lung(body wants to shunt it to a better ventilated area); however if the whole lung is diseased, this just makes a lot of HTN for the RV to push against
most common cause of RV failure
LV failure!
in LV failure, RV failure is a sign that things are BAAAAD