Systolic Function Flashcards
formula for LV fractional shortening
(LVIDd-LVIDs)/LVIDd x 100%
formula for cross sectional area
πr^2 = 0.785 x d^2
formula for stroke volume via 2D
EDV-ESV, [mL]
formula for single plane ejection fraction
(LVIDd^3-LVIDs^3)/LVIDd^3 x 100% =
(EDV-ESV)/EDV x 100% =
SV/EDV x 100%
formula for biplane ejection fraction
(∑LVIDd^3-∑LVIDs^3)/∑LVIDd^3 x 100% =
(∑EDV-∑ESV)/∑EDV x 100%
What assumption is being made by equating LVIDd^3=EDV?
the ventricle shape is a prolate ellipse
formula for cardiac output
SV(L) x HR, [L/min]
formula for stroke volume via Doppler
CSA x VTI, [mL]
formula for fractional area change
(EDA-ESA)/EDA x 100%
same as EF, just with areas
What does TAPSE stand for?
Tricuspid Annular Plane Systolic Excursion
What does TAPSE measure?
DISPLACEMENT of lateral TV annulus
What does TDI stand for?
Tissue Doppler Imaging
What does TVI stand for?
Tissue Velocity Imaging
Tissue Velocity Imaging, aka
Tissue Doppler Imaging
Tissue Doppler Imaging, aka
Tissue Velocity Imaging
Where do you place the TDI sample volume for the TV?
1 cm inferior/apical of TV lateral annulus
What does TDI of the TV measure?
VELOCITY of tissue displacement at the lateral annulus
What part of the TDI wave is measured to assess systolic function?
s’ wave
What does Dp/Dt measure?
global systolic performance via the rate of rise of systolic pressure on the mitral regurg.
How do you do Dp/Dt?
CW with colour of MR in A4CH, increase sweep speed to 150-250 cm/s, optimize signal, measure the time it takes for the regurgitant flow to go from 1 m/s to 3 m/s on the acceleration slope
formula for Dp/Dt
ΔP/Δt x 1000 = 4v^2/Δt x 1000, [mmHg]
formula for pressure gradient
P1-P2 = 4v^2
What does Speckle Tracking measure?
measures strain in each wall segment by tracking two 2D speckles within each segment
What does Deformation Imaging measure?
measures strain in each wall segment by tracking two 2D speckles within each segment
