Objective:To explore the value of HDlive Flow in prenatal diagnosis of the velamentous placenta.Methods:A total of 2 723 pregnant women underwent prenatal ultrasonography in the second trimester and delivered at Zhejiang Provincial People's Hospital from January 2019 to January 2020, and 48 of them were diagnosed as having velamentous placenta confirmed by postpartum clinical and pathological examination and were included in this retrospective analysis. Two-dimensional echocardiography-color Doppler flow imaging (2D-CDFI) and HDlive Flow were both performed during the prenatal ultrasound examination. The sonographic features of velamentous placenta by HDlive Flow were summarized and the prenatal detection rate between two methods were compared using Chi-square test. Results:The incidence of velamentous placenta was 1.8% (48/2 723) in our hospital. Out of the 48 enrolled cases, 45 were diagnosed by HDlive Flow with a detection rate of 93.8% (45/48), three of them were complicated by vasa previa; the other three cases were misdiagnosed as battledore placenta. There were 38 cases diagnosed by 2D-CDFI with a detection rate of 79.2% (38/48), which was lower than HDlive Flow ( χ2=4.360, P=0.037); the other ten cases were misdiagnosed as battledore placenta. The sonographic features by HDlive Flow were as follow: (1) Umbilical cord attached to fetal membranes outside the placenta in 41 cases with the umbilical vessels distributing along the fetal membrane in a mesh pattern; (2) In three cases, the umbilical cord insertion was located on fetal membranes at the edge of placenta; (3) One case was shown that umbilical cord and the branches of umbilical vessels were inserted into the placenta in a "λ" shape. Conclusions:The anatomy of the umbilical cord, umbilical blood vessels and placenta can be directly shown under HDlive Flow, which can improve the prenatal detection rate of the velamentous placenta.

Objective To discuss correlation of serum BDNF and cognitive behavioral abnormalities in children with OSAHS. Methods Sixty children with OSAHS from Jan 2013 to Oct 2014 were selected as subjects. Correlation of cog-nitive behavioral abnormalities and serum BDNF was analyzed. Results Conners score of OSAHS group was higher than the control group(P<0.01);cognitive behavioral abnormalities rates of OSAHS group was higher(P<0.01). Serum BD-NF of OSAHS group was lower than control group than the control group(P<0.01). Serum BDNF of cases with cognitive behavioral abnormalities of OSAHS group was lower than cases without cognitive behavioral abnormalities (P<0.01). Serum BDNF of OSAHS was negative with conners score (r=-0.866,P<0.01). Conclusion Cognitive behavioral abnor-mality is negative with serum BDNF in children with OSAHS.