Chapter 7 - Working With Measurements
Measuring Cardiac Exams
Terason t3000 / Echo Ultrasound System User Guide
195
Aortic Valve
Area by
Continuity
Equation Using
Vmax
AVA: aortic valve area (cm
2
)
CSA
LVOT
: cross-section area of
LVOT (cm
2
)
Vmax
LVOT
: maximum velocity in
LVOT (m/s)
Vmax
AoV
: maximum velocity across
aortic valve (m/s)
LVOT: left ventricular outflow tract
cm
2
Aortic Valve
Area by
Continuity
Equation Using
TVI
AVA: aortic valve area (cm
2
)
CSA
LVOT
: cross-section area of
LVOT (cm
2
)
TVI
LVOT
: time velocity integral in
LVOT (m)
TVI
AoV
: time velocity integral across
aortic valve (m)
LVOT: left ventricular outflow tract
cm
2
Flow Area
d: diameter (cm)
cm
2
Mitral Valve
Area by
Continuity
Equation Using
Aorta
MVA: mitral valve area (cm
2
)
CSA
LVOT
: cross-section area of
LVOT (cm
2
)
TVI
LVOT
: time velocity integral in
LVOT (m)
TVI
MV
: time velocity integral of
mitral valve (m)
LVOT: left ventricular outflow tract
cm
2
Mitral Valve
Area by
Continuity
Equation Using
Pulmonary
Artery
MVA: mitral valve area (cm
2
)
CSA
PA
: cross-section area of
pulmonary artery (cm
2
)
TVI
PA
: time velocity integral of
pulmonary artery (m)
TVI
MV
: time velocity integral of
mitral valve (m)
cm
2
Right
Ventricular
Systolic
Pressure from
Tricuspid
Regurgitation
P
RA
: estimated right arterial
pressure (mmHg)
V
max
:regurgitant velocity of
tricuspid valve (m/s)
mmHg
Doppler Formulas (Continued)
Name
Variables
Formula
Units
AVA
CSA
LVOT
Vmax
LVOT
Vmax
AoV
-----------------------------
=
AVA
CSA
LVOT
TVI
LVOT
TVI
AoV
-----------------------
=
FlowArea
d
2
4
-----
=
MVA
CSA
LVOT
TVI
LVOT
TVI
MV
-----------------------
=
MVA
CSA
PA
TVI
PA
TVI
MV
-----------------
=
RVSP
P
RA
4
V
2
max
+
=