Cardiac Formulas And References; Formulas - Siemens ACUSON Cypress Operator's Manual

Cardiac Formulas and References

Formulas

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