Editorial
Is aortic valve resistance more clinically meaningful than valve area in aortic stenosis?
| The first 150 words of the full text of this article appear below. |
The
concept of valve resistance was introduced as a "stenotic index" in
the 1950s,1 but it did not reach the worldwide acceptance
obtained in the same years by the Gorlin formula to calculate valve
area. In more recent years this relatively old concept has been
restored as a method for assessing the severity of aortic
stenosis.2 3 Aortic valve resistance is simply the
pressure gradient/flow rate ratio expressed in units of
dyne.s.cm
5. Aortic valve resistance is commonly
calculated using cardiac catheterisation with the following equation:
(1.333 × P) 
(CO/HR × SEP)
where CO is cardiac output (ml/min), HR is heart rate
(beats/min), SEP is systolic ejection period (s/beat), and 1.333 is the
conversion factor from mm Hg to dyne.s.cm5. Aortic valve
resistance can also be accurately measured by Doppler echocardiography, using the following formula:
1.333 × 4Vmax2/ area LVOT × velocity LVOT
where V is the maximum velocity recorded across the aortic valve by
continuous wave Doppler, area LVOT is the
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This article has been cited by other articles:
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Cattaneo, P., Baravelli, M., Rossi, A., Mariscalco, G., Romano, M., Imperiale, D., Bregasi, A., Anza, C.
(2009). Ejection Fraction/Velocity Ratio Identifies Prosthesis-Patient Mismatches in Patients With Aortic Bioprosthetic Valves and Left Ventricular Dysfunction. J Ultrasound Med
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[Abstract] [Full Text] -
Little, S. H, Chan, K.-L., Burwash, I. G
(2007). Impact of blood pressure on the Doppler echocardiographic assessment of severity of aortic stenosis. Heart
93: 848-855
[Abstract] [Full Text]
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