Siemens ACUSON Cypress Operator's Manual page 166

Cardiac Calculations
6-22
Doppler Formulas (Cardiac)
TABLE 31.
Type Formula
Aortic Valve
AVA
Area by the
Continuity
Equation using
AVA is Aortic Valve Area (cm
TVI
CSA
TVI
TVI
(m).
LVOT is Left Ventricular Outflow Tract.
Flow Area from
Diameter
Flow Area
d is diameter (cm).
Mitral Valve
MVA
Area by the
Continuity
Equation using
MVA is Mitral Valve Area (cm
LVOT
CSA
TVI
TVI
LVOT is Left Ventricle Outflow Tract.
Mitral Valve
MVA
Area by the
Continuity
Equation using
MVA is mitral valve Area (cm
Pulmonary
CSA
Artery
TVI
TVI
Right Ventricu-
RVSP
lar Systolic
Pressure from
P
RA
Tricuspid
V
max
Regurgitation
Right Ventricu-
RVSP
lar Systolic
Pressure from
BP
Ventricular
V
max
Septal Defect
ACUSON Cypress™ Operator's Manual
TVI
• LVOT
= ------------------- -
CSA
LVOT
TVI
AoV
2
is cross-sectional Area of LVOT (cm
LVOT
is the Time Velocity Interval in the LVOT (m).
LVOT
is the Time Velocity Interval across the aortic valve
AoV
2
⎛ ⎞
d
π •
= ---- -
⎝ ⎠
4
TVI
•
LVOT
= ------------------- -
CSA
LVOT
TVI
MV
is cross-sectional Area of LVOT (cm
LVOT
is the Time Velocity Integral of LVOT (m).
LVOT
is the Time Velocity Integral of mitral valve (m).
MV
TVI
•
PA
= -------------- -
CSA
PA
TVI
MV
2
is cross-sectional Area of pulmonary artery (cm
PA
is the Time Velocity Integral of pulmonary artery (m).
PA
is the Time Velocity Integral of mitral valve (m).
MV
2
= P + 4V
RA max
is estimated Right Atrial pressure (mmHg).
is regurgitant Velocity of tricuspid valve (m/s).
2
= BP – 4V
sys max
is systolic Blood Pressure (mmHg).
sys
is maximum Velocity of ventricular septal defect (m/s).
).
2
).
2
).
2
).
).
2
Units
2
cm
2
cm
2
cm
2
cm
).
mmHg
mmHg