Feeds:
Posts
Comments

Posts Tagged ‘planimetery’

Planimetery is the age old method to measure the mitral valve  area( MVA) by echocardiography.

Advantage

  • Simple modality
  • 2D echo  is enough
  • Doppler errors avoided
  • In the presence of MR, planimetery orifice has an edge over other methods

Disadvantage

  • Optimal gain setting becomes  important .There is  significant inter and intra observer variability.
  • Shape of the orifice is not constant  ( MVO is funnel like) . Narrowest diameter is usually measured.
  • Planimetery is  a purely an anatomical orifice,while blood flows through both primary and secondary mitral orifices .Sub valvular fusion makes secondary MVO the  narrowest point  . Measuring it becomes difficult as it has no defintion of border.
  • Gross errors possible in calcified valve.
  • In post commissurtomy  the  lateral extent of split is often  not tractable

How to improve the accuracy of planimetery ?

Color Doppler aided  2D  planimetery . This can improve some of the limitations , as  it provides a hemodynamic MVO(Some what physiological ) Of course  , pressure halftime derived MVO is purely a physiological orifice .

Other options to measure MVO

  1. Pressure half time
  2. Continuity equation
  3. PISA method

Advantages and disadvantages  of Pressure half time derived MVO will be posted soon.

Read Full Post »