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      Doppler Echocardiographic Determination of Geometric Orifice Areas in Mechanical Aortic Valve Prostheses

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          Abstract

          In 63 St. Jude bileaflet and 34 Bjoerk-Shiley tilting disk aortic valve prostheses, Doppler continuity areas were compared to their corresponding geometric areas defined by the opening angle of the occluders. Continuity areas correlated significantly with geometric areas in Bjoerk-Shiley (p = 0.68) and St. Jude prostheses (p = 0.86). Differences between continuity and geometric areas were greater in St. Jude than in Bjoerk-Shiley valves (0.87 ± 0.45 cm<sup>2</sup> vs. 0.06 ± 0.47 cm<sup>2</sup>, p < 0.0001). Exclusion of patients with atrial fibrillation, with a postoperative interval of less than 1 year or valve sizes of 19 and 21 mm did not change the results. Thus, underestimation of geometric areas is present in the St. Jude bileaflet aortic valves, while geometric and continuity areas are not significantly different in Bjoerk-Shiley prostheses. These results are attributable to the effect of valve-type-dependent velocity profiles.

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          Author and article information

          Journal
          CRD
          Cardiology
          10.1159/issn.0008-6312
          Cardiology
          S. Karger AG
          0008-6312
          1421-9751
          1995
          1995
          19 November 2008
          : 86
          : 6
          : 508-513
          Affiliations
          Department of Cardiology, University of Erlangen-Nuremberg, Germany
          Article
          176931 Cardiology 1995;86:508–513
          10.1159/000176931
          7585763
          © 1995 S. Karger AG, Basel

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          Page count
          Pages: 6
          Categories
          Noninvasive Diagnostic Cardiology

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