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A comparison of two forms of the continuity equation in the
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Trifecta bovine pericardial aortic valve
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Running head: The continuity equation in the Trifecta valve
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John B Chambers MD FACC
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Denise Parkin RGN
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James Roxburgh FRCS
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Vinayak Bapat FRCS
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Christopher Young FRCS
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Cardiothoracic Centre, Guy’s and St Thomas’ Hospitals, London SE1 7EH, UK
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Correspondence:
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Prof JB Chambers, Cardiothoracic Centre, St Thomas’ Hospital, London SE1 7EH,
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UK.
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Tel: 44-(0)20-7188-1047 Fax: 44-(0)20-7188-0728
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[email protected]
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E-mail:
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Abstract
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Aim
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in small Trifecta valves
To compare the classical and simplified form of the continuity equation
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This was a retrospective analysis of postoperative echocardiograms
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Methods
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performed for clinical reasons after implantation of Trifecta bioprosthetic valves.
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There were 60 patients aged 74 (range 38-89) years. For the valves of
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Results
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size 19mm, 21mm and 23mm, the mean gradient was respectively 11.3mmHg,
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10.7mmHg and 9.7mmHg. The effective orifice areas by the classical form of the
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continuity equation were respectively 1.4cm2, 1.7cm2 and 1.9 cm2. There was a good
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correlation between the two forms of the continuity equation but they were
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significantly different using a t-test (p0.65 and
