Department of Obstetrics, Reproduction and Reproductive Disorders, Faculty of Veterinary Medicine, Trakia University, Stara Zagora, Bulgaria.
Department of Surgery, Radiology, Obstetrics and Gynecology, Faculty of Veterinary Medicine, University of Forestry, Sofia, Bulgaria.
Vet Med Sci. 2021 Jul;7(4):1297-1302. doi: 10.1002/vms3.463. Epub 2021 Mar 1.
The aim of the present study was to determine the parameters characterising the blood flow velocity in the fetal heart and aorta in goats by Doppler ultrasonography. Twenty-four Bulgarian White milk goats, aged 4-6 years, weighing 45-51 kg were used in the study. Doppler ultrasound measurements of the blood flow velocity in fetal heart were done at the end of first, second and third trimesters of pregnancy, and in the fetal aorta - at the end of the second and third trimesters of pregnancy. Ultrasound investigations were carried out by transabdominal approach with linear and convex transducers, with frequency 8.0 MHz. Blood flow parameters that included maximum and minimum systolic velocity, end-diastolic velocity, pulsatility index, resistance index and systolic/diastolic ratio were measured by spectral Doppler ultrasonography. The results showed that the highest maximum systolic velocity in the fetal heart was observed at the end of the first pregnancy trimester. Statistically significantly (p < 0.05) lower values of this parameter were registered in the second and third pregnancy trimesters. A similar tendency was observed for minimum systolic velocity, end-diastolic velocity and systolic/diastolic ratio. The pulsatility index and resistance index had similar values for the three studied periods. Examination of the fetal aorta showed statistically significant differences (p < 0.05) of minimum systolic velocity, end-diastolic velocity, pulsatility and resistance index in the third, compared with the second trimester of pregnancy. The analysis of the results suggested that Doppler ultrasonography can be used to monitor fetal blood flow changes during the various stages of pregnancy.
本研究旨在通过多普勒超声检查确定羊胎儿心脏和主动脉血流速度的特征参数。 研究使用了 24 只 4-6 岁、体重 45-51kg 的保加利亚白奶山羊。 在妊娠第一、二、三期末对胎儿心脏血流速度进行多普勒超声测量，在妊娠第二、三期末对胎儿主动脉血流速度进行多普勒超声测量。 超声检查采用经腹途径，使用线性和凸性探头，频率为 8.0MHz。 通过频谱多普勒超声测量包括最大和最小收缩期速度、舒张末期速度、搏动指数、阻力指数和收缩/舒张比在内的血流参数。 结果表明，胎儿心脏的最大收缩期速度在妊娠第一期末最高。 在第二和第三妊娠期末，该参数的数值明显（p<0.05）较低。 最小收缩期速度、舒张末期速度和收缩/舒张比也呈现出类似的趋势。 搏动指数和阻力指数在三个研究期间具有相似的值。 对胎儿主动脉的检查显示，与妊娠第二期末相比，第三期末的最小收缩期速度、舒张末期速度、搏动和阻力指数均存在统计学差异（p<0.05）。 结果分析表明，多普勒超声检查可用于监测妊娠各期胎儿血流变化。
