Aortic Valve Stenosis: Difference between revisions

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 |-
 |[[Image:AoScw03.jpg|350px]]
-|
+|Video
 |-
 !Serious AoS: PG max 101mmHg, PG mean 69mmHg<cite>1</cite>
@@ Line 54: / Line 54: @@
 {| class="wikitable" cellpadding="0" cellspacing="0" border="0"
 |-
-|colspan="2"|Continuity equation:
+|colspan="2"|'''Continuity equation:''' A1.v1 = A2.v2
-A1.v1 = A2.v2
 |-
-|[[Image:Continuiteitsvergelijking.png|350px]]
+|[[Image:Continuty_equation.svg|350px]]
-|Where: A=area (&prod;r<sup>2</sup>) cm<sup>2</sup>
+|valign="top" bgcolor="FFFFFF"|
+:'''Where:''' A=area (&prod;r<sup>2</sup>) cm<sup>2</sup>
-v=velocity, cm/s (can be used as maximum speed or TVI)
+:v=velocity, cm/s (can be used as maximum speed or TVI)
 |-
-|colspan="2"|so :
+|colspan="2"|'''so:'''
 Aortic valve area (AVA)=( D LVOT/2 )<sup>2</sup> x 3:14 x  Vmax LVOT/Vmax peak in AoS jet
-Where: D LVOT=diameter LVOT in cm
+'''Where:''' D LVOT=diameter LVOT in cm
 |}
@@ Line 74: / Line 73: @@
 DI = V LVOT/V aorta
-In a DI = 25, there is almost always a severe aortic valve stenosis .
-==Low- gradient aortic stenosis vs . pseudo stenosis==
+In a DI ≤25, there is almost always a severe aortic valve stenosis .
-In an aortic valve stenosis with a low gradient (<30 mmHg ), and poor left ventricular function is to be a valve surface calculated . If an AVA <1 cm ² is calculated can be a severe aortic valve stenosis are present despite the low gradient . However, it could also be that the valve does not open properly due to low cardiac output ( pseudo stenosis ) . To gain more insight into the aortic valve or a "true " or stenosis has a "pseudo stenosis " seems dobutamine stress worthwhile . If during dobutamine infusion up to 20 micrograms / kg there is an increase of more than 20 % in the LVOT VTI (ie cardiac output ) and the calculated valve area remains below 1 cm ² then there is a true aortic stenosis . If not , and there appears to be a contractile reserve (which is predictive of a better prognosis after aortic valve replacement ) it is called a pseudo stenosis.
+==Low-gradient aortic stenosis vs . Pseudo stenosis==
+In an aortic valve stenosis with a low gradient (< 30 mmHg), and poor left ventricular function is to be a valve surface calculated . If an AVA <1 cm<sup>2</sup> is calculated can be a severe aortic valve stenosis are present despite the low gradient. However, it could also be that the valve does not open properly due to low cardiac output (pseudo stenosis). To gain more insight into the aortic valve or a "true" or stenosis has a "pseudo stenosis" seems dobutamine stress worthwhile. If during dobutamine infusion up to 20 μg/kg there is an increase of more than 20% in the VTI of the LVOT (ie cardiac output ) and the calculated valve area remains below 1 cm<sup>2</sup> then there is a true aortic stenosis . If not , and there appears to be a contractile reserve (which is predictive of a better prognosis after aortic valve replacement ) it is called a pseudo stenosis.
 ==References==