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Discrepancies between sizer and valve dimensions: implications for small aortic root

C Bartels1, R G Leyh, J F Matthias Bechtel

  • 1Department of Cardiac Surgery, Medical University of Lübeck, Germany.

The Annals of Thoracic Surgery
|July 1, 1998
PubMed
Summary
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Manufacturers' markings on small aortic valve prostheses and sizers are often inaccurate. Actual dimensions varied significantly, impacting optimal valve selection for patients with small aortic roots.

Area of Science:

  • Cardiovascular Surgery
  • Biomedical Engineering
  • Medical Device Technology

Background:

  • Accurate sizing of aortic prostheses is critical for successful implantation, particularly in patients with small aortic roots.
  • Discrepancies in manufacturers' labeled dimensions can lead to suboptimal device selection and potentially adverse outcomes.

Purpose of the Study:

  • To evaluate the accuracy of manufacturers' markings on small mechanical aortic prostheses and associated sizers.
  • To quantify the discrepancies between labeled and actual dimensions of these devices.

Main Methods:

  • Twenty-two different mechanical aortic prostheses (19-23 mm) were analyzed.
  • Calibrated micrometer measurements were used to determine actual sizer and valve annulus dimensions.
  • Orifice areas were calculated based on measured diameters.

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Main Results:

  • Sizers frequently exceeded their marked dimensions by up to 1.0 mm.
  • Measured tissue annulus diameters showed considerable variation from labeled sizes (e.g., 19-mm valves ranged from 18.3 to 19.6 mm).
  • Calculated orifice areas also varied significantly, impacting hemodynamic performance predictions.

Conclusions:

  • Significant discrepancies exist between the labeled and actual dimensions of small mechanical aortic prostheses and sizers.
  • These variations necessitate careful consideration during surgical planning to ensure optimal prosthesis selection and patient outcomes.
  • Clinicians should be aware of potential sizing inaccuracies when choosing devices for small aortic roots.