Transrectal Doppler ultrasound was used for the noninvasive investigation of uterine blood flow in three @entity291 during pregnancy. The uterine arteries ipsi and contralateral to the conceptus were scanned monthly. Blood flow was reflected by the following parameters: resistance index (RI), time-averaged maximum velocity ( @entity22603 ), diameter of the vessel (D) and the volume of blood flow (VOL). RI values were negatively correlated to all other blood flow parameters (P < 0.01). Positive correlations occurred between @entity22603 , D and VOL (P < 0.0001). While blood flow parameters did not differ between @entity291 (P > 0.05), the month of gestation showed a positive effect on RI and negative effects on @entity22603 , D and VOL (P < 0.0001). The RI was lower and @entity22603 , D and VOL higher in the uterine artery ipsilateral to the conceptus (P < 0.05). RI values decreased continuously during the first 8 months of gestation and remained from then until birth at a relatively constant level. While @entity22603 increased especially in two-thirds of pregnancy, a relatively uniform rise of D was noticed. VOL increased exponentially with stage of gestation. The results show that transrectal Doppler sonography is a suitable, noninvasive method for the examination of uterine blood flow during pregnancy in @entity291 . Using this technique it might be possible in the future to determine the role of uterine blood flow in @entity291 at the risk of abortion.

Transrectal Doppler sonography of uterine blood flow in XXXX during pregnancy.

@entity22603 :: ('151043', 'Species') :: ['TAMV'] @entity291 :: ('9913', 'Species') :: ['cows']
@entity291 :: (9913,Species) :: ['cows']
