Hydrodynamic function of ten prosthetic heart values in the aortic position

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Abstract
The hydrodynamic function of five mechanical, four pericardial and one porcine size 23 mm aortic prosthetic valves has been analysed by measuring pressure differences, regurgitation and energy losses in a pulsatile flow test rig. St Jude Medical, Hancock pericardial and Mitral Medical pericardial valves had the lowest pressure drop. Calculations of total energy loss showed that the Bjork-Shiley monostruct had similar overall function to the above valves, while the Ionescu-Shiley Standard, Ionescu-Shiley Low Profile, Omniscience and Duromedics valves had slightly greater total energy losses. The Bjork-Shiley spherical disc and Wessex Medical porcine valve had the greatest energy losses. The function of the newer designs of pericardial valves compared well with the mechanical valves currently available.

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