EchocardiographyExercise StressMiscExercise Stress
Duke Treadmill ScoreMaximum Predicted Heart Rate (DOB)Mets & VO2 (Treadmill)
Maximum Predicted Heart Rate (Age)Max. Predicted Heart Rate AchievedRate Pressure Product
Prev

Pulmonary-Systemic Flow Ratio (Qp/Qs)

Calculation


LVOT mm
LVOT VTI cm
RVOT mm
RVOT VTI cm


Qp/Qs
Calculate

Clear
Top

Information

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


Fatal error: Uncaught Error: Call to undefined function ereg_replace() in /u/c/cardio/www.csecho.ca/wp-content/themes/twentyeleven-csecho/cardiomath/index.php:472 Stack trace: #0 {main} thrown in /u/c/cardio/www.csecho.ca/wp-content/themes/twentyeleven-csecho/cardiomath/index.php on line 472