Doppler Ultrasonographic Study on Haemodynamic Alterations in Medically Terminated Canine Pregnancies
DOI:
https://doi.org/10.48165/Keywords:
Canine pregnancy, Doppler, Progesterone, Resistive index, Umbilical arteryAbstract
This study evaluated maternal and fetal haemodynamic changes in medically terminated canine pregnancies using Doppler ultrasonography. Twelve pregnant bitches (35-40 days gestation) were divided into a Group I (control group, n=6) and Group II (treatment group n=6). A combination protocol of cloprostenol (1 µg/kg SC every 48 h) and cabergoline (5 µg/kg PO daily) was used to induce abortion for bitches in group II. Parameters assessed included biparietal diameter (BPD), combined thickness of uterus and placenta (CTUP), fetal heart rate (FHR), progesterone levels, and Doppler parameters (PSV, EDV, RI, PI, S/D ratio) in the uteroplacental artery (UPA), umbilical artery (Uma) and fetal aorta (FA). All group II bitches aborted within 3-5 days, with progesterone dropping below 1 ng/mL by day 5. Significant haemodynamic disruptions were observed post-treatment, including increased UPA resistance (RI >0.61, EDV <15 cm/s) and diminished Uma diastolic flow, signaling placental insufficiency. No structural differences in BPD or CTUP were noted. These findings underscore Doppler’s role in high-risk pregnancy management and abortion monitoring in canines.
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