Qp/Qs can be estimated by using 2-D echo and spectral Doppler measurements in patients who have intra- or extra-cardiac shunts e.g. atrial or ventricular septal defects.
Qp =
RVOT VTI * π *
RVOT
2
2
Qs =
LVOT VTI * π *
LVOT
2
2
Qp/Qs Ratio =
Qp/Qs
Variable
Definition
Input
LVOT
Left ventricular outflow tract diameter (mm)
LVOT VTI
RVOT subvalvular velocity time integral (cm)
RVOT
Left ventricular outflow tract diameter (mm)
RVOT VTI
RVOT subvalvular velocity time integral (cm)
Output
Qp/Qs
Pulmonary-Systemic Shunt Ratio
References
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