Assertion: pericardial valve | /r/HasProperty | the standard
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Source sentences:
text: In order to demonstrate visually the reasons for the great haemodynamic difference between the pericardial and porcine valves, Ionescu recorded in a 'pulse duplicator' the opening characteristics of two porcine valves (Hancock Modified Orifice and the recently modified Edwards valve) and two pericardial valves ( the Standard and the Low-Profile Shiley valves).