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Mitral Stenosis: Difference between revisions
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==Quantification of mitral valve stenosis== | ==Quantification of mitral valve stenosis<cite>1</cite>== | ||
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|[[Image:MS01.jpg | |[[Image:MS01.jpg]] | ||
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!Moderate / severe MS | !Moderate / severe MS | ||
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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== | |||
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|By using an empirical formula the mitral valve area can be calculated using: MVA = 220/PHT. | |||
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|bgcolor="#FFFFFF" align="center"|[[Image:MVPHT.png]] | |||
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===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== | ==References== | ||
<biblio> | <biblio> | ||
#1 pmid=20435783 | #1 pmid=20435783 | ||
#2 pmid=3190958 | |||
</biblio> | </biblio> | ||