简介:<正>1原文摘要Abnormalflowintheductusvenosusat11-13weeksofgestationisassociatedwithincreasedriskfortrisomy21andotherchromosomalabnorma-lities.Ineuploidfetuses,abnormalflowintheductusvenosusisassociatedwithanincreasedriskforcardiacdefects.However,moststudiesexaminingsucha