Bollwein H, Maierl J, Mayer R, Stolla R
Gynäkologische und Ambulatorische Tierklinik, LMU München, Germany.
Theriogenology. 1998 Jun;49(8):1483-8. doi: 10.1016/s0093-691x(98)00094-6.
Color Doppler ultrasound was used transrectally in 6 mares to locate both the left and right Aa. uterinae and to obtain flow velocity waveforms at defined times (Days 0, 5, 10, 15 and 20) during 4 estrous cycles. Blood flow reflected by the resistance index (RI) was determined for both arteries on 120 occasions. As there was no significant difference and a high correlation in the RI values between the left and right arteries (paired Student's t-test, correlation coefficient r > 0.94; P < 0.05), the average RI value was used for subsequent analyses. There were correlations between RI values, mares and day of estrous cycle (P < 0.0001). The mean RI was higher (P < 0.05) in the 2 multiparous mares (age, 12 to 13 yr) than in the 4 younger maiden mares (age, 6 to 10 yr). During the estrous cycle mean RI values on Day 0 (day of ovulation) and Day 10 were higher (P < 0.05) than on Days 5, 15 and 20, whereas between estrous cycles within mares no differences (P > 0.05) could be measured. The results suggest that transrectal Color Doppler sonography is a noninvasive method for examining differences in impedance to uterine blood flow between different mares and cycle periods.
经直肠对6匹母马进行彩色多普勒超声检查，以定位左右子宫动脉，并在4个发情周期的特定时间（第0、5、10、15和20天）获取血流速度波形。在120个时间点测定了两条动脉的血流阻力指数（RI）所反映的血流情况。由于左右动脉的RI值无显著差异且相关性较高（配对t检验，相关系数r>0.94；P<0.05），因此后续分析采用平均RI值。RI值、母马和发情周期天数之间存在相关性（P<0.0001）。2匹经产母马（年龄12至13岁）的平均RI高于4匹年轻处女母马（年龄6至10岁）（P<0.05）。在发情周期中，第0天（排卵日）和第10天的平均RI值高于第5、15和20天（P<0.05），而同一母马不同发情周期之间无差异（P>0.05）。结果表明，经直肠彩色多普勒超声检查是一种用于检测不同母马及不同周期子宫血流阻抗差异的非侵入性方法。
