Siemens ACUSON Cypress

Cardiac Calculations
6-16 ACUSON Cypress™ Operator’s Manual
LV Mass
A
1
is SAX epicardial diastolic area (cm
2
).
A
2
is SAX endocardial diastolic area (cm
2
).
L is Apical length in diastole (cm).
t is mean myocardial thickness.
g
cm
LV Mass Index
(LVMI)
LV Mass (g).
BSA is Body Surface Area (m
2
).
g/m
2
Body Surface
Area
(BSA)
W is weight (kg) (range: 0.5—160.0 kg).
H is height (cm) (range: 15.0—204.0 cm).
m
2
Fractional Area
Change
(% FAC)
LVd is LV diastolic area (cm
2
).
LVs is LV systolic area (cm
2
).
%
Flow Area
d is diameter (cm).
cm
2
Fractional
Shortening
(% FS)
LVd is diastolic dimension (cm).
LVs is systolic dimension (cm).
%
TABLE 29. 2D Formulas (Cardiac)
Type Formula Units
LV Mass 1.05
5
6
--- A
1
Lt+()()
5
6
--- A
2
L•()–
⎝⎠
⎛⎞
=
t
A
1
π
------
⎝⎠
⎛⎞
A
2
π
------
⎝⎠
⎛⎞
–
⎝⎠
⎛⎞
=
LVMI
LV Mass
BSA
-----------------------=
BSA 0.007184 W
kg
0.425
H
cm
0.725
()=
% FAC
LVd LVs–
LVd
--------------------------
⎝⎠
⎛⎞
100•=
Flow
Area π
d
2
4
-----
⎝⎠
⎛⎞
•=
% FS
LVd LVs–
LVd
--------------------------
⎝⎠
⎛⎞
100•=