Mitral Stenosis: Difference between revisions

Mitral Stenosis (view source)

Revision as of 22:57, 9 December 2013

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-==Quantification of mitral valve stenosis==
+==Quantification of mitral valve stenosis<cite>1</cite>==
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-|[[Image:MS01.jpg|500px]]
+|[[Image:MS01.jpg]]
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 !Moderate / severe MS
 |}
+Various techniques can be used to estimate the severity of a mitral valve stenosis.
+The peak pressure is unreliable for assessing the severity of mitral valve stenosis. Also, the pressure differential is strongly influenced by the heart rate. A high heart rate will greatly increase the pressure difference due to the strongly reduced duration of diastole. For heart rates between 60 - 90/min , the average gradient is estimated by "tracing" of the CW signal across the mitral.
+==Pressure half-time==
+{| class="wikitable" cellpadding="0" cellspacing="0" border="0"
+|-
+|By using an empirical formula the mitral valve area can be calculated using: MVA = 220/PHT.
+|-
+|bgcolor="#FFFFFF" align="center"|[[Image:MVPHT.png]]
+|}
+===Pitfalls:===
+In any situation where the LV diastolic pressure rises rapidly (AOI, non-compliant LV, myocardial ischemia) will give an underestimation of the severity of mitral valve stenosis.
+Immediately after balloon dilatation of the mitral valve, the method unreliable PHT
+Tachycardia at which the A-top merges with the E-top or boezemflutter which flutter waves the E-wave deformation may overestimate the incidence of mitral stenosis.
+Heart rates of between 60 and 90/min give best results
+Click [http://csecho.ca/cardiomath/?eqnHD=echo&eqnDisp=mvsmgh here] for Wilkins score (also called Mitral Valvuloplasty score)
 ==References==
 <biblio>
 #1 pmid=20435783
+#2 pmid=3190958
 </biblio>