Siemens ACUSON Cypress

ACUSON Cypress™ Operator’s Manual 6-15
Cardiac Formulas and References
Cardiac Formulas and References
2D Formulas
TABLE 29. 2D Formulas (Cardiac)
Type Formula Units
LV Volume:
Method of
Disks, Biplane
a
di
is the i
th
disk diameter of LV apical 2 chamber (cm).
b
di
is the i
th
disk diameter of LV apical 4 chamber (cm).
L is the chamber length from either A4C or A2C, whichever is
longest (cm).
20 is the number of disk segments into which the ventricle is
divided.
ml
LV Volume:
Method of
Disks,
Single Plane
a
di
is the i
th
disk diameter of LV apical 2 or 4 chamber (cm).
L is the chamber length of the cavity (cm).
ml
Ejection
Fraction
V is LV volume (ml).
s is systole.
d is diastole.
%
Stroke Volume
V is LV volume (ml).
s is systole.
d is diastole.
ml
Cardiac Output
SV is stroke volume (ml).
HR is heart rate (bpm).
l/min
Cardiac Index
CO is cardiac output (l/min).
BSA is Body Surface Area (m
2
).
l/min/m
2
V
π
4
--- Σ
i 1=
20
a
di
b
di
L
20
------•=
V
π
4
--- Σ
i 1=
20
a
2
di
L
20
------•=
EF
Vd Vs–
Vd
-------------------
⎝⎠
⎛⎞
100•=
SV Vd Vs–=
CO
SV HR•()
1000
--------------------------=
CI
CO
BSA
-----------=