Limitations in the Assessment of Prosthesis-Patient Mismatch

Paulo A. Amorim, Mahmoud Diab, Mario Walther, Gloria Färber, Andreas Hagendorff, Robert O. Bonow, Torsten Doenst*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Background âProsthesis-patient mismatch (PPM) after aortic valve replacement (AVR) may affect survival but data are conflicting. It is assessed by relating effective orifice area (EOA) to body surface area (EOAi). EOA is patient-specific as the result of flow-velocity times area at the individual patient's outflow tract levels (LVOT A) divided by trans-prosthetic flow velocity. However, some studies use projected EOAs (i.e., valve size associated EOAs from other patient populations) to assess how PPM affects outcome. Methods âWe analyzed 76 studies addressing hemodynamic outcome and/or mortality after bioprosthetic AVR. Results âIn 48 studies, projected or measured EOA for calculation of EOAi and PPM assessment was used (of which 25 demonstrated an effect on survival). We identified 28 additional studies providing measured EOA values and the corresponding Bernoulli's pressure gradients after AVR. Despite EOA being a patient-specific parameter, 77% of studies assessing a PPM impact on survival used projected EOAs. The 28 studies are providing measured EOA values and the corresponding Bernoulli's pressure gradients in patients after AVR showed a highly significant, linear relationship between EOA and Bernoulli's gradient. Considering this relationship, it is surprising that relating EOA to body surface area (BSA) (EOAi) is standard but relating pressure gradients to BSA is not. Conclusion âWe conclude that the majority of studies assessing PPM have used false assumptions because EOA is a patient-specific parameter and cannot be transferred to other patients. In addition, the use of EOAi to assess PPM may not be appropriate and could explain the inconsistent relation between PPM and survival in previous studies.

Original languageEnglish (US)
Article number185256oc
Pages (from-to)550-556
Number of pages7
JournalThoracic and Cardiovascular Surgeon
Volume68
Issue number7
DOIs
StatePublished - Oct 1 2020
Externally publishedYes

Keywords

  • aortic valve replacement
  • cardiac surgery
  • echocardiography
  • flow velocity
  • hemodynamic evaluation
  • pressure gradient

ASJC Scopus subject areas

  • Surgery
  • Pulmonary and Respiratory Medicine
  • Cardiology and Cardiovascular Medicine

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