A Quantitative Study Of Right Ventricular Function In The Normal Second And Third Trimester Fetuses By M-mode Tricuspid Annular Displacement (TAD)

Objeetive:To quantitative study of right ventricular function in the normal seeond and third trimester fetuses by M-mode tricuspid annular displacement(TAD).Methods:From October2010to April2011.161pregnant women were recruited into study group (GA29.1±4.6weeks(ws).range19-38ws,age27.6±3.8years(ys),range17-40ys). Study group was divided into two groups:79seeond trimester fetuses(28ws.GA24.7±2.1ws,range19-28ws) and82third trimester fetuses(≥28ws,GA31.312.6ws, range28-28ws).TAD was measured by using conventional M-mode cehocardiography, meanwhile multiple parameters for evaluating right ventreular function were obtained by using pulsed Doppler echocardiography and myocardial Dopple tissue imaging (DTI).The correlation between TAD and other parameters were analyzed by using SPSS17.0.Results:In normal second and third trimester fetuses.the TAD was9.38±1.71mm with a range of5.79-13.90mm,and was inereased with the growth of GA.TAD was correlated with GA, E, A, Em, Am and Sm significantly (r=0.759,0.547,0.320,0.497,0.483and0.598respectively, all P<0.001),TAD was not correlated with HR (P>0.05). TAD showed differences between the second trimester fetuses and the third trimester fetuses (P<0.05)Conclusions:In normal second and third trimester fetuses, the TAD was increased with the growth of GA,and has good correlation with GA,E, A, Em, Am and Sm respectively,and may become a new promising modality to evaluate function of RV simply and accurately.The technique will be propitious to use in hospitals (without DTI) because of simplicity of operator and lower requirement on the technology and equipment precision.