Pós-Graduação em Ciências Médicas, Fluminense Federal University, Rio de Janeiro, Brazil.
Ultrasound Q. 2020 Sep;36(3):263-267. doi: 10.1097/RUQ.0000000000000480.
Our main objective was to evaluate the ophthalmic artery Doppler behavior in twin pregnancies and compare with singleton pregnancies. We studied 64 healthy twin pregnant women between 12 to 38 weeks of gestation. Resistance index (RI), pulsatility index (PI), and peak ratio (PR) were determined. The control group consisted of 289 singletons. Linear regression analysis was performed to evaluate the association between gestational age and the ophthalmic indexes. Student t test was used to compare the means and standard deviation of the Doppler indexes. There was a decrease in RI and PI and an increase in PR with advancing gestational age (ρ < 0.0001, 0.0052, and 0.0033). The means ± SDs for RI, PI, and PR were 0.77 ± 0.07, 1.79 ± 0.46, and 0.53 ± 0.12, in women with twin pregnancies and 0.75 ± 0.05, 1.88 ± 0.43, and 0.52 ± 0.10 in singletons. No significant difference was found between the PI and PR values, but significant difference was found in the RI values between the groups (P = 0.0332). We concluded that there are no significant differences in ophthalmic artery behavior in twins and the same reference values established in singleton pregnancies can be applied for PI and PR indexes in the evaluation of twin pregnancies. These indexes were the best to evaluate twin pregnancies.
我们的主要目的是评估双胞胎妊娠中的眼动脉多普勒行为，并与单胎妊娠进行比较。我们研究了 64 名 12 至 38 孕周的健康双胞胎孕妇。确定了阻力指数（RI）、搏动指数（PI）和峰值比（PR）。对照组由 289 名单胎妊娠者组成。进行线性回归分析以评估妊娠龄与眼动脉指数之间的相关性。采用学生 t 检验比较多普勒指数的均值和标准差。随着妊娠龄的增加，RI 和 PI 降低，PR 增加（ρ＜0.0001，0.0052 和 0.0033）。双胞胎妊娠者的 RI、PI 和 PR 的均值±SD 分别为 0.77±0.07、1.79±0.46 和 0.53±0.12，单胎妊娠者分别为 0.75±0.05、1.88±0.43 和 0.52±0.10。两组间 PI 和 PR 值无显著差异，但 RI 值有显著差异（P=0.0332）。我们得出结论，双胞胎妊娠中的眼动脉行为无显著差异，可以应用于单胎妊娠的 PI 和 PR 指数来评估双胞胎妊娠。这些指数是评估双胞胎妊娠的最佳选择。
