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ECHONOMY
Tools for Echocardiographic Calculations
Muhamed Saric, MD, PhD
New York University
 

Regurge Volume.M1

Purpose
To calculate mitral regurgitant volume using quantitative Doppler at the level of the mitral valve and LVOT.

Technical Hints
The method uses the standard Doppler determination of stroke volume across an orifice as the product of the cross sectional area of the orifice and the VTI at the level of the orifice. For mitral valve, pulsed Doppler sample volume must be place at the level of the mitral annulus and not at the mitral leaflet tips (as it is done for diastology).

Calculator
MITRAL VALVE:    
Diameter of MV annulus in A4C view:  cm
Diameter of MV annulus in A2C view:  cm
Mitral VTI at annular level: cm
LVOT:    

LVOT Diameter (d):

 cm

LVOT VTI:

 cm


 		  

Answers
MITRAL VALVE:    

Mitral Valve Area (MVA):
(Assuming that MV is an ellipse).
 

 cm2
TOTAL STROKE VOLUME (TSV) :

 mL
LVOT:    

LVOT Area:

 cm2

TRUE SYSTEMIC STROKE VOLUME (TSSV):

 mL
REGURGITANT VOLUME & FRACTION:    
REGURGITANT VOLUME (RegVol):
(RegVol = TSV - TSSV)
 		  mL Look-up Table
REGURGITANT FRACTION (RegFrac):
(RegFrac = RegVol / TSV)
 		  % Look-up Table

Formulas

LVOT Area = (1/2 * d)2 * pi

MVA = pi * [1/2 * A4C Diameter] * [1/2 * A2C Diameter]

Reference

Zhang Y, Nitter-Hauge S, Ihlen H, Myhre E. Doppler echocardiographic measurement of cardiac output using the mitral orifice method.  Br Heart J. 1985 Feb;53(2):130-6.