Turbulent/viscous interactions control Doppler/catheter pressure discrepancies in aortic stenosis. The role of the Reynolds number

Circulation
E G CapeL M Valdes-Cruz

Abstract

Despite good correlation between Doppler and catheter pressure drops in numerous reports, it is well known that Doppler tends to apparently overestimate pressure drops obtained by cardiac catheterization. Neither (1) simplification of the Bernoulli equation nor (2) pressure recovery effects can explain this dilemma when taken alone. This study addressed the hypothesis that a Reynolds number-based approach, which characterizes (1) and (2), provides a first step toward better agreement of catheter and Doppler assessments of pressure drops. Doppler and catheter pressure drops were studied in an in vitro model designed to isolate the proposed Reynolds number effect and in a sheep model with varying degrees of stenosis. Doppler pressure drops in vitro correlated with the directly measured pressure drop for individual valves (r = .935, .960, .985, .984, .989, and .975) but with markedly different slopes and intercepts. A Bland-Altman type plot showed no useful pattern of discrepancy. The Reynolds number was successful in collapsing the data into the profile proposed in the hypothesis. Parallel results were found in the animal model. Apparent overestimation of net pressure drop by Doppler is due to pressure recovery effects, and these...Continue Reading

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Citations

Nov 20, 1998·Journal of the American College of Cardiology·J P Murgo
Jan 15, 2000·Journal of the American College of Cardiology·C G DeGroffL Valdes-Cruz
Apr 7, 2012·Journal of Cardiovascular Magnetic Resonance : Official Journal of the Society for Cardiovascular Magnetic Resonance·Julio GarciaLyes Kadem
Sep 24, 2013·Journal of Cardiovascular Magnetic Resonance : Official Journal of the Society for Cardiovascular Magnetic Resonance·Julio GarciaÉric Larose
Jan 11, 2011·Progress in Pediatric Cardiology·Richard S FigliolaTain-Yen Hsia
May 20, 2005·Echocardiography·Payam AghassiDennis A Tighe
Nov 25, 2004·Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography·Alessandro GiardiniTheresa A Tacy
Jan 29, 1999·Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography·D E SolowiejczykL M Valdes-Cruz
Feb 28, 2006·Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography·Curt DeGroff
Dec 27, 2005·International Journal of Cardiology·Joachim G EichhornHerbert E Ulmer
May 21, 1999·The American Journal of Cardiology·M S LemlerE G Cape
Jul 13, 2001·The American Journal of Cardiology·P GjertssonO Bech-Hanssen
Dec 5, 2002·Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography·Piers C A BarkerAlbert P Rocchini
Sep 8, 2006·The American Journal of Geriatric Cardiology·Joel A StromBlase A Carabello
May 21, 2008·European Journal of Echocardiography : the Journal of the Working Group on Echocardiography of the European Society of Cardiology·Alessandro Giardini, Theresa A Tacy
Jan 24, 2020·Cardiology and Therapy·Seyed Hossein Aalaei-AndabiliAnthony A Bavry

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