Abstract:<正>Highgradestenosesmaycausecriticalflowandmechanicalconditionssuchasnegativepressure,flowsepanion,highshearstressandwallcompressioninarterieswhichmayberelatedtoplateletaggregation,thrombusformation,atherosclerosisgrowthandplaquecaPruPturewhichleadsdirectlytostrokeandheartattack.Theexatmechanismofthese