Defaults: 1X 2X 3X 4X      
Pssst! It's me, the website.

I just wanted to let you know that even though I'm looking quite old, I'm still a millenial.
So I just had a "New Year, New Me" moment and my resolution is to become a new and improved version of myself in a couple of weeks.
Don't worry, my wisdom won't change. You're still going to find the same useful information here. Stay tuned!

E-Echo will be continuing to be available after this year! A new company is taking over.
Effective Regurgitant Orifice by Continuity Equation
Aortic Regurgitation
Calcs>Aortic Regurgitation>ERO by CE>1
Calculator
MV Diameter
cm
MV VTI cm
LVOT Diameter cm
LVOT VTI cm
Regurg Jet VTI cm
 
MV CSA cm2
MV SV mls
LVOT CSA cm2
LVOT SV mls
RV mls
ERO cm2

 
Formulas
 

SVMV = CSAMV x VTIMV

SVMV = 0.785 x DMV2 x VTIMV

 

SVAV = CSALVOT x VITAV

SVAV = 0.785 x DLVOT2 x VTIAV

 

EROAR = (SVAV - SVMV) / VTIAR

 

 
How to get a Regurgitant Volume in Aortic Regurgitation.
 
Step 1: Measure the Diameter of the LVOT. The diameter can be of the LVOT should be obtained from the midesophageal AVLAX view, in mid systole, and under the zoom mode.  The view of the LVOT should not be an obtuse angle view.  The aortic valve leaflets (NCC and RCC) should be clearly seen.  The zoom mode will decrease the error present in the calculation.  Since the LVOT diameter changes throughout systole, the mid systole measurement should be obtained. 
 
Step 2: Obtain a VTI of the LVOT.    The VIT of the LVOT is obtained from a PWD of the LVOT.   The PWD of the LVOT should be obtained at the same location as the LVOT diameter measurement.  The PWD beam should not be off more than 15° from parallel to the LVOT flow.  After tracing the flow on the echocardiographic machine, a VTI of the PWD tracing will be calculated.  A continuous wave doppler (CWD) of the LVOT could be obtained, but, since the CWD introduces ambiguity into the equation and since flows in the LVOT rarely exceed the aliasing velocity of the pulse wave doppler, PWD is the best measurement mode.  However, in aortic regurgitation, there is excessive flow, so aliasing may occur.  Therefore, CWD may be required to be able to trace the whole flow profile.  The systolic flow profile is the VTI of the LVOT.  The diastolic flow profile the the regurgitant jet (RJ) VTI.
 
Step 3: Obtain a Mitral Valve Diameter. The area of the mitral valve can be calculated from this measurement.  This enter some inaccuracy into the equation since the mitral valve is not a circle (it is oval).  Therefore, the pulmonary valve could be used instead.  This measurement is to be used to generate a value that represents normal forward flow in the cardiac cycle.
 
Step 4:  Obtain a Mitral Valve VTI.  Using the PWD mode, trace the envelope of the entire (E wave and A wave) flow profile of the mitral valve.

Previous Page
Next Page
 
 
Instution Info  
User Info  
CME Info  
Help  
User License  
HIPAA  
Privacy Policy  
References   
Calcs   
 
Copyright Statement
© Copyright 2000-2023 JLS Interactive, LLC.
Content from this web site may not be used or reproduced for non-personal or
commercial purposes without express written permission by JLS Interactive, LLC.