Siemens ACUSON Cypress Operator's Manual page 160

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