Abstract: ［Abstract］ Objective〖HTSS〗〓To investigate the changes and clinical value of blood flow spectrum parameters of umbilical artery(UA) and ductus venous(DV) in fetuses with tricuspid regurgitation at different degrees.
〖HTH〗〖WTHZ〗Methods〖HTSS〗〓Two hundreds and fiftythree fetuses(20-41+6week without structural defects) were divided into 3 groups: 68 cases with mild tricuspid regurgitation(mild group), 20 cases with moderate tricuspid regurgitation(moderate group) and 165 normal fetuses(control group). The blood flow spectrum of UA and DV in each group was obtained. The parameters of UA: peak systolic velocity(S), end diastolic velocity(D), S/D ratio, resistance index(RI) and pulsatility index(PI) were measured. Then the parameters of DV peak ventricular systolic velocity(S), peak atrial systolic velocity(A), S/A ratio, RI and PI were measured. Finally, conduct comparative analysis among the three groups was used.
〖HTH〗〖WTHZ〗Results〖HTSS〗〓There was no significant difference in S/D, RI, PI of UA and S/A, RI and PI of DV between mild reflux group and control group(P＞005). The parameters of UA blood flow spectrum S/D, RI, PI and DV in moderate reflux group were higher than those in control group and mild reflux group(P＜005).
〖HTH〗〖WTHZ〗Conclusion〖HTSS〗〓UA and DV blood flow spectrum can be used to evaluate the condition of fetus and placenta when tricuspid regurgitation happens. Therefore, it can provide substantial support for intervening measures.

Key words: umbilical arteries, fetus, tricuspid valve insufficiency, ultrasonography