Siemens ACUSON Cypress

Cardiac Calculations
6-18 ACUSON Cypress™ Operator’s Manual
M-Mode Formulas
TABLE 30. M-Mode Formulas (Cardiac)
Type Formula Units
Fractional
Shortening
(% FS)
LVd is diastolic dimension (cm).
LVs is systolic dimension (cm).
%
Fractional
Thickening–
Interventricu-
lar Septum
(% FT)
IVSs is Interventricular Septum in systole.
IVSd is Interventricular Septum in diastole.
%
Fractional
Thickening–
Left Ventricular
Posterior Wall
(% FT)
LVPWs is Left Ventricular Posterior Wall in systole.
LVPWd is Left Ventricular Posterior Wall in diastole.
%
Volume Cubed
LVID is left ventricular internal diameter (cm).
ml
Volume
Teichholz
LVID is left ventricular internal diameter (cm).
ml
Ejection
Fraction Cubed
Vd is diastolic volume cubed (ml).
Vs is systolic volume cubed (ml).
%
Ejection
Fraction
Teichholz
Vd is diastolic volume Teichholz (ml).
Vs is systolic volume Teichholz (ml).
%
Stroke Volume
Cubed
Vd is diastolic volume cubed (ml).
Vs is systolic volume cubed (ml).
ml
Stroke Volume
Teichholz
Vd is diastolic volume Teichholz (ml).
Vs is systolic volume Teichholz (ml).
ml
% FS
LVd LVs–
LVd
--------------------------
⎝⎠
⎛⎞
100•=
% FT
IVSs IVSd–
IVSd
------------------------------
⎝⎠
⎛⎞
100•=
% FT
LVPWs LVPWd–
LVPWd
---------------------------------------------
⎝⎠
⎛⎞
100•=
VLVID
3
=
V
7
2.4 LVID+
---------------------------- LVID
3
()
⎝⎠
⎛⎞
=
EF
Vd Vs–
Vd
-------------------
⎝⎠
⎛⎞
100•=
EF
Vd Vs–
Vd
-------------------
⎝⎠
⎛⎞
100•=
SV Vd Vs–=
SV Vd Vs–=