Aortic valve area: Difference between revisions
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==Overview== | ==Overview== | ||
The severity of [[aortic stenosis]] can be assessed by estimating both the pressure gradient across the valve and the surface area of the valve. The latter can be calculated using echocardiographic flow velocities and the trans-valvular pressure gradient can be calculated using the following equation: <blockquote>Pressure Gradient = 4 x (velocity of blood through the valve)<sup>2</sup> mmHg</blockquote> | The severity of [[aortic stenosis]] can be assessed by estimating both the pressure gradient across the valve and the surface area of the valve. The latter can be calculated using echocardiographic flow velocities and the trans-valvular pressure gradient can be calculated using the following equation: <blockquote>Pressure Gradient = 4 x (velocity of blood through the valve)<sup>2</sup> mmHg</blockquote> | ||
==Cardiac Catheterization== | |||
Simultaneous measurement of left ventricular '''output''' ''(measures the flow through the aortic valve)'' and the '''pressure gradient''' across the aortic valve provides the essential variables that is required to calculate the aortic valve area and resistance.<ref>Hirshfeld JW, Kolansky DM. Valve function: Stenosis and regurgitation. In: Diagnostic and Therapeutic Cardiac Catheterization, 2nd ed, Pepine CJ, Hill JA, Lambert CR (Eds), Williams & Wilkins, Baltimore 1994. p.443</ref><ref>Carabello BA, Grossman W. Calculation of stenotic valve orifice area. In: Cardiac Catheterization and Angiography, 3rd ed, Grossman W (Ed), Lea and Febiger, Philadelphia 1986. p.143.</ref> | |||
====[[Aortic valve area calculation#Cardiac Catheterization: Gorlin Equation|Gorlin Equation]]==== | |||
==References== | ==References== | ||
Revision as of 14:10, 12 April 2012
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Aortic Stenosis Microchapters |
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Diagnosis |
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Treatment |
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Percutaneous Aortic Balloon Valvotomy (PABV) or Aortic Valvuloplasty |
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Transcatheter Aortic Valve Replacement (TAVR) |
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Case Studies |
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Aortic valve area On the Web |
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American Roentgen Ray Society Images of Aortic valve area |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-In-Chief: Lakshmi Gopalakrishnan, M.B.B.S. [2]
Overview
The severity of aortic stenosis can be assessed by estimating both the pressure gradient across the valve and the surface area of the valve. The latter can be calculated using echocardiographic flow velocities and the trans-valvular pressure gradient can be calculated using the following equation:
Pressure Gradient = 4 x (velocity of blood through the valve)2 mmHg
Cardiac Catheterization
Simultaneous measurement of left ventricular output (measures the flow through the aortic valve) and the pressure gradient across the aortic valve provides the essential variables that is required to calculate the aortic valve area and resistance.[1][2]
Gorlin Equation
References
- ↑ Hirshfeld JW, Kolansky DM. Valve function: Stenosis and regurgitation. In: Diagnostic and Therapeutic Cardiac Catheterization, 2nd ed, Pepine CJ, Hill JA, Lambert CR (Eds), Williams & Wilkins, Baltimore 1994. p.443
- ↑ Carabello BA, Grossman W. Calculation of stenotic valve orifice area. In: Cardiac Catheterization and Angiography, 3rd ed, Grossman W (Ed), Lea and Febiger, Philadelphia 1986. p.143.