Abstract：
OBJECTIVE: This study aims to assess the feasibility and effectiveness of color doppler flow imaging (CDFI) technology and the Slow Flow HD imaging technique in identifying fetal pulmonary veins (PVs) in the first trimester (11-13 + 6 weeks), and further explore the factors affecting fetal pulmonary vein identification in early pregnancy.
METHODS: Echocardiography and scanning of PVs were performed in 240 normal singleton fetuses in early pregnancy by using CDFI and slow flow HD techniques, to compare the ability of two methods to identify the PVs. Slow Flow HD technology was used to further investigate the difference of PVs identification at different gestational ages [group I (11-11 + 6 weeks), group II (12-12 + 6 weeks), group III (13-13 + 6 weeks)] and with different maternal body mass indices (BMI) (≥ 25 and < 25). In 31 cases of 240 fetuses, transvaginal ultrasonography was added due to maternal habitus or significant retroversion of the uterus, and the difference in PVs identification between transabdominal and transvaginal examination was analyzed.
RESULTS: Successful PVs identification rates via CDFI and Slow Flow HD were 32.0% and 88.3%, respectively (p < 0.05). The identification rate of at least one and two pulmonary veins in Slow Flow HD was 88.3% and 76.2%, and all four pulmonary veins in 11.6% (p < 0.05). The identification rate of group I, II and III were 76.4%, 88.9% and 96.0%, respectively. The identification rate was 45.1% in the transabdominal ultrasound group and 83.8% in the transvaginal ultrasound group. The identification rate was 62.5% in the BMI ≥ 25 group and 94.7% in the BMI < 25 group (p < 0.05).
CONCLUSIONS: Slow Flow HD can detect PVs in early pregnancy more often than using CDFI. Slow Flow HD is a feasible and effective imaging technique for evaluating PVs in early pregnancy.
METHODS: Echocardiography and scanning of PVs were performed in 240 normal singleton fetuses in early pregnancy by using CDFI and slow flow HD techniques, to compare the ability of two methods to identify the PVs. Slow Flow HD technology was used to further investigate the difference of PVs identification at different gestational ages [group I (11-11 + 6 weeks), group II (12-12 + 6 weeks), group III (13-13 + 6 weeks)] and with different maternal body mass indices (BMI) (≥ 25 and < 25). In 31 cases of 240 fetuses, transvaginal ultrasonography was added due to maternal habitus or significant retroversion of the uterus, and the difference in PVs identification between transabdominal and transvaginal examination was analyzed.
RESULTS: Successful PVs identification rates via CDFI and Slow Flow HD were 32.0% and 88.3%, respectively (p < 0.05). The identification rate of at least one and two pulmonary veins in Slow Flow HD was 88.3% and 76.2%, and all four pulmonary veins in 11.6% (p < 0.05). The identification rate of group I, II and III were 76.4%, 88.9% and 96.0%, respectively. The identification rate was 45.1% in the transabdominal ultrasound group and 83.8% in the transvaginal ultrasound group. The identification rate was 62.5% in the BMI ≥ 25 group and 94.7% in the BMI < 25 group (p < 0.05).
CONCLUSIONS: Slow Flow HD can detect PVs in early pregnancy more often than using CDFI. Slow Flow HD is a feasible and effective imaging technique for evaluating PVs in early pregnancy.
摘要：
目的：本研究旨在评估彩色多普勒血流成像（CDFI）技术和慢血流HD成像技术在识别妊娠早期（11-13+6周）胎儿肺静脉（PVs）中的可行性和有效性。并进一步探讨影响孕早期胎儿肺静脉识别的因素。
方法：采用CDFI和慢血流HD技术对240例正常妊娠早期单胎胎儿进行超声心动图和肺静脉扫描，比较两种方法识别PV的能力。SlowFlowHD技术用于进一步研究不同胎龄下PVs识别的差异[I组(11-11+6周),II组（12-12+6周），组III（13-13+6周）]和不同的母体体重指数（BMI）（≥25和<25）。在240例胎儿中，有31例，经阴道超声检查是由于产妇的习惯或严重的子宫逆行，分析经腹与经阴道检查PVs鉴别的差异。
结果：通过CDFI和SlowFlowHD的成功PVs识别率分别为32.0％和88.3％，分别为(p<0.05)。慢血流HD中至少1个和2个肺静脉的识别率分别为88.3%和76.2%,所有四个肺静脉占11.6％（p<0.05）。I组的识别率，II和III分别为76.4％，88.9%和96.0%,分别。经腹超声组为45.1%,经阴道超声组为83.8%。BMI≥25组为62.5%,BMI<25组为94.7%(p<0.05)。
结论：慢血流HD比使用CDFI更能检测妊娠早期肺静脉。慢血流HD是评价孕早期肺静脉的一种可行且有效的影像学技术。
方法：采用CDFI和慢血流HD技术对240例正常妊娠早期单胎胎儿进行超声心动图和肺静脉扫描，比较两种方法识别PV的能力。SlowFlowHD技术用于进一步研究不同胎龄下PVs识别的差异[I组(11-11+6周),II组（12-12+6周），组III（13-13+6周）]和不同的母体体重指数（BMI）（≥25和<25）。在240例胎儿中，有31例，经阴道超声检查是由于产妇的习惯或严重的子宫逆行，分析经腹与经阴道检查PVs鉴别的差异。
结果：通过CDFI和SlowFlowHD的成功PVs识别率分别为32.0％和88.3％，分别为(p<0.05)。慢血流HD中至少1个和2个肺静脉的识别率分别为88.3%和76.2%,所有四个肺静脉占11.6％（p<0.05）。I组的识别率，II和III分别为76.4％，88.9%和96.0%,分别。经腹超声组为45.1%,经阴道超声组为83.8%。BMI≥25组为62.5%,BMI<25组为94.7%(p<0.05)。
结论：慢血流HD比使用CDFI更能检测妊娠早期肺静脉。慢血流HD是评价孕早期肺静脉的一种可行且有效的影像学技术。
