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'''Numerical manipulation''' of Doppler parameters obtain during routine [[Echocardiography]] has been extensively utilized to non-invasively estimate intra-cardiac pressures, in many cases removing the need for invasive cardiac catheterization.<ref>{{cite journal |pmid=3366997 | volume=11 | title=Prediction of the severity of aortic stenosis by Doppler aortic valve area determination: prospective Doppler-catheterization correlation in 100 patients | year=1988 | journal=J. Am. Coll. Cardiol. | pages=1227–34 | doi=10.1016/0735-1097(88)90286-0}}</ref>
Echocardiography uses ultrasound to create real-time anatomic images of the [[heart]] and its structures. [[Doppler echocardiography]] utilizes the Doppler principle to estimate intracardiac velocities. Via the modified [[Bernoulli's principle|Bernoulli equation]], velocity is routinely converted to pressure gradient for use in clinical cardiology decision making.<ref>http://www.wikiecho.org/wiki/Aortic_stenosis</ref>
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