Effective Valve Opening Area in the Detection of Dysfunctional Aortic Valve Prostheses: A Differentiated Statistical Analysis of This Parameter Including the Introduction of Minimal Expected Normal Values as Borderline to Dysfunctional Stenotic Prostheses

Bogunović, Nikola; Horstkotte, Dieter; Faber, Lothar; Bogunovic, Lukas; Kececioglu, Deniz; Piper, Cornelia; Prinz, Christian; Buuren, Frank van

doi:10.1111/j.1540-8175.2011.01659.x

Cited by 1 publication

(6 citation statements)

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“…In contrast to correctly functioning aortic valve prostheses [23], in MP the mean PPGs and MPGs and the corresponding Doppler velocities were rather independent of prosthetic size and construction principle. The mean MPGs were averaged between 3 and 6 mmHg (Fig.…”

Section: Transprosthetic Gradientsmentioning

confidence: 60%

“…3). Compared to values of correctly functioning aortic valve prostheses [23], the standard deviations of mean VAs in mitral prostheses were larger. To have almost identical values when applying CE VTI versus PHT, we calculated the constant, which should be used in PHT.…”

Section: Va In Correctly Functioning Mitral Valve Prosthesesmentioning

confidence: 83%

“…This was to find out whether PHT can be adapted to analyse mitral prostheses. Finally, this study could be a basis for following studies to improve detection of mitral prosthesis dysfunction as suggested by our group in aortic valve prostheses previously [23].…”

Section: Va To Evaluate Prosthetic Functionmentioning

confidence: 93%

“…As part of a different trial of 2001 heart valve prostheses (1369 aortic [23], 632 mitral valve prostheses), 267 consecutive patients were included in this sub-study (123 males, 144 females, mean age 67, range 4-88 years) with normally functioning MP (13 manufacturers/brands: 191 bileaflet, 36 mono-tilting disc, 40 xenograft MP).…”

Section: Study Groupmentioning

confidence: 99%

“…Additional parameters like dimensionless valve index, geometric/constructional orifice area, energy loss coefficient, proximal isovelocity area (PISA) and VA were investigated and lead to supplement data for a number of valve designs [5,[14][15][16][17][18][19][20][21][22][23][24][25]. Recommendations of the American Society of Echocardiography concerning the evaluation Abstract Detection of dysfunctional mitral valve prostheses (MP) remains complex even though being optimized by considering echocardiographically derived prosthetic effective orifice area (VA).…”

Section: Introductionmentioning

confidence: 99%

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Echocardiographically derived effective valve opening area in mitral prostheses: a comparative analysis of various calculations using continuity equation and pressure half time method

et al. 2015

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Detection of dysfunctional mitral valve prostheses (MP) remains complex even though being optimized by considering echocardiographically derived prosthetic effective orifice area (VA). The purpose was to compare VA in MP, calculated by the continuity equation (CE) using peak velocities (CEVpeak), mean velocities (CEVmean), velocity-time integrals (CEVTI) and the pressure half time method using 220 ms as constant first (PHT220) as well as optimized constants. In 267 consecutive patients with normally functioning MP, we investigated VA within the first postoperative month. With increasing prosthetic sizes, mean VA values also increase in all calculations. The statistical curves demonstrate no significant difference in graphical steepness but show different levels. Comparison of mean VA showed the known systematic higher values of PHT220 and significantly decreased results when using CEVTI. This systematic difference between mean VA applying PHT220 versus CEVTI is approximately 1.0 cm(2) for all prosthetic sizes. Calculations via CEVpeak were close to the results of CEVTI. CEVmean produced values, which graphically correspond to the PHT220 curve. Only PHT220 detected the constructional equal prosthetic inner ring width between 29 and 31 mm. To compensate the systematic difference between CEVTI and PHT220, an optimized constant of 140 ms was calculated to be applied in PHT (PHT140). VA is a robust and, therefore, preferable parameter for investigating MP. If needed, both CE and PHT are applicable with a systematical difference between CEVTI and PHT220. An optimized constant of 140 ms (PHT140) should be applied when calculating VA of mitral valve prostheses via PHT.

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Section: Transprosthetic Gradientsmentioning

confidence: 60%

Section: Va In Correctly Functioning Mitral Valve Prosthesesmentioning

confidence: 83%

Section: Va To Evaluate Prosthetic Functionmentioning

confidence: 93%

Section: Study Groupmentioning

confidence: 99%