LV systolic function Flashcards
describe ventricular systole
- depolarization of the ventricles followed by mechanical contraction
AO intracardiac pressure
systolic = 120 diastolic = 70 mean = 80
mean RA pressure
4
RV pressures
systolic 25
diastolic 4
LV pressures
systolic 120
diastolic 10
LA mean pressure
10
PA pressures
systolic 25
diastolic 10
mean 16
what shape is the pressure loop for the LV
rectangle
what shape is the pressure loop for the RV
triangle
preload
- muscles length or stretch @ end diastole
afterload
tension that the LV must overcome before fiber shortening & contraction
factors that increase stroke volume
- increased preload
- decreased afterload
- increased inotropy
factors that decrease stroke volume
- decrease preload
- increase afterload
- decrease inotropy
quantitative systolic measurement
- FS
- EF
- simpsons
- Area length method
- SV
Dt/dp - tissue doppler
- MPI
- global strain
what length percentage must the A4c and A2c views be within?
<10%
cardiac output formula
SV x HR = CO
stroke volume formula
SV = EDV-ESV
whats the dp/dt measurement used for
- tine it takes for LV pressure to rise by 32 mmHg
normal t in dp/dt
<27ms
dp value
32000
normal dp/dt values
> 1200
severe <800
what is tethering
- when hypokinetic or akinetic segment is adjacent to a normal srgment and gets dragged along by its motion
normal MPI conventional method value
<0.44
MPI formula conventional method
MPI=(IVCT+IVRT)% ET
MPI tissue doppler method values
LV normal <0.6
RV normal <0.55
how ma views need to be seen to be scored qualitatively
2 or more
TDI RV S prime value
> 9.5
FAC normal
> 35%
TAPSE normal
> 17mm
RV base, mid and length
<41
<35
<86
RVOT proc and distal diameter normals
<3.3
<2.7
