Systolic Function Msmts Flashcards
IVCT
Isovolumic Contraction
- Valves Closed
- Volume Constant
- Ventricular Pressure Increasing
IVRT
Isovolumic Relaxation
- Valves are closed
- Volume Constant
- Ventricular Pressure Decreasing
When is IVRT measured?
Time from the closure of the AOV until Mitral flow begins
When is IVCT measured?
Measured from closure of MV until AOV flow begins.
AKA pre-ejection period
What serves as indirect signs of Systolic Function?
EPSS
MV opening
Gradual closure of AOV in systole
What is the formula for fractional shortening?
LVIDd-LVIDs/LVIDd x 100
What is the normal range for fractional shortening?
25-45%
What is fractional shortening derived from?
Linear LV cavity msmts from diastole to systole.
Gives rough estimate of systolic LV function.
What is the definition of Stroke Volume?
The amount of blood ejected per beat.
What is the normal range for SV?
70-100cc
What is the formula for SV?
SV=CSA x VTI
CSA
Cross Sectional Area
Usually LVOT
0.785 x diameter squared
VTI
Velocity Time Integral
What is the definition of Cardiac Output?
Amount of blood ejected per min
What is the normal range for CO?
4-8 lpm
What is the formula for CO?
SV x HR
What is the definition for CI?
CO corrected for body size
What is the calculation for CI?
CO/BSA
BSA derived from height and weight data entry
What is the normal range for CI?
2.5-4.0 lpm/m squared
What does Ejection Fraction estimate?
Estimate of the % ejected during systole
What is the calculation for EF?
EDV-ESV/EDV x 100
OR
SV/EDV x 100
What is the normal range for EF?
50-75%
most commonly visually estimated
Using the Simpson’s Method of Disks, what and when are the 2-D traces taken?
Apical 2 and Apical 4 chamber taken at end-diastole and end-systole
About how many equally spaced disks are there usually?
Around 20
