Aortic Valve Insufficiency: Difference between revisions

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Aortic Valve Insufficiency (view source)

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==Pressure half-time (PHT)==
==Pressure half-time (PHT)==
The pressure half-time is dependent upon both the volume and regurgitation of the diastolic function of the left ventricle ( compliance ) . However, in severe aortic valve insufficiency , the left ventricle rather " full" hit so will the pressure half-time short they cause even an end - diastolic mitral insufficiency occurred . Will also be taken so that the pressure half-time will shorten . Off when poorly tolerated aortic valve insufficiency diastolic function of the left ventricle
The pressure half-time depends on both the volume as regurgitation of the diastolic function of the left ventricle (compliance). However, in severe aortic valve insufficiency of the left ventricle is more likely to become "full" so that the pressure half-time will be short, this may result in diastolic mitral regurgitation to occur. Also this will make the pressure half-time to shorten. Thus completing the diastolic function of the left ventricle with a poorly tolerated aortic valve insufficiency.


vena contracta
==Vena contracta==
The VC appears to correlate with the effective surface regurgitation ( ERO ) very well. Moreover, the VC appears to be the afterload or diastolic function of the left ventricle independently. Therefore, this seems to be the severity of aortic valve insufficiency . A very good size
The VC appears to correlate with the effective surface regurgitation (ERO) very well. In addition, the VC is found to be of the afterload or diastolic function of the left ventricle. Independently this seems to be the severity of aortic valve insufficiency of a very good size.
A VC diameter > 6mm appears to have a serious AOI . A very good sensitivity and specificity
A VC < 5mm suggests a non-serious Aoi.


Pulsed - wave Doppler of flow in descending aortic
A VC diameter> 6mm appears to have a serious, very good sensitivity and specificity Aoi.
Retrograde flow in Ao - descending , supra sternal immediately after subclavian artery measured by pulsed- wave Doppler .
If end diastolic flow velocity :
< 18 cm / s are not indicative of hemodynamically significant AOI ( grade I and II )
> 18 cm / s indicates Aol hemodynamically significant ( grade III and IV )
In severe Aoi therefore initially > 0.6 m / s
TVI backflow signal > 15 cm


[[Image:Aodescflow.png|300px]]
A VC <5mm suggests a non-serious Aoi.
 
==Pulsed - wave Doppler of flow in descending aortic==
Retrograde flow in Ao-descending, supra sternal immediately after subclavian artery measured by pulsed-wave Doppler.
 
If end diastolic flow velocity:
 
<18 cm/s does not indicate hemodynamically significant AOI (grade I and II)
 
>18 cm/s indicates hemodynamically significant Aol (grade III and IV)
 
In severe then Aoi initially> 0.6 m/s
 
TVI backflow signal> 15cm
 
{| class="wikitable" cellpadding="0" cellspacing="0" border="0"
|-
|bgcolor="FFFFFF" colspan="2" align="center"|[[Image:Aodescflow.png|600px]]
|-
!width="250px"|Normal descending flow
!Holo Diastolic flow reversal in descending aorta
|}


==References==
==References==
Nilofer
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