Doppler Ultrasonographic Evaluation of Maternal and Foetal Blood Flow in Bitches Approaching Delivery by Different Whelping Modes
DOI:
https://doi.org/10.48165/ijar.2025.46.01.2Keywords:
Doppler ultrasonography, Pulsatility index, Resistance indexAbstract
Present study included 28 healthy bitches which, based on modes of whelping, were divided into four groups viz., Group I (Vaginal whelping/VW), Group II (elective caesarean section/CS), Group III (emergency CS) and Group IV (induction of whelping). Doppler evaluations were conducted within one hour before whelping to assess blood flow measurements in the uteroplacental artery (UPA), umbilical artery (UMA), and fetal abdominal aorta (FAA) using pulsatility (PI) and resistance indices (RI). The mean PI and RI of UPA were 1.10 ± 0.06, 1.30 ± 0.09, 1.07 ± 0.06, and 1.07 ± 0.10, and 0.62 ± 0.02, 0.71 ± 0.02, 0.64 ± 0.02 and 0.66 ± 0.04 respectively, in Groups I, II, III and IV. The mean PI and RI of UMA were 1.26 ± 0.05, 1.39 ± 0.07, 1.23 ± 0.07 and 1.21± 0.11, and 0.67 ± 0.01, 0.73 ± 0.02, 0.70 ± 0.03 and 0.67 ± 0.03 respectively, in the aforesaid groups. The mean PI and RI of FAA were 1.36 ± 0.11, 1.55 ± 0.10, 1.55 ± 0.07 and 1.40 ± 0.16, and 0.73 ± 0.02, 0.72 ± 0.02, 0.75 ± 0.01 and 0.71 ± 0.03, respectively in the aforesaid groups. No significant difference (p>0.05) could be noticed in the mean PI and RI of different vessels between the groups on the day of parturition. Increased Doppler indices, especially in the UPA, close to whelping may result from reduced diastolic blood flow to the uterus due to uterine contractions.References
Arun, R., Sridevi, P., Jeyaraja, K. and Chandrasekar, M. (2016). Doppler ultrasonography of uterine arteries in pregnant canines - A preliminary study. Indian J. Anim. Reprod., 37(2): 46-47.
Blanco, P. G., Tórtora, M., Rodríguez, R., Arias, D. and Gobello, C. (2010). Ultrasonographic assessment of maternal cardiac
Med., 39: 143-149.
Di Salvo, P., Bocci, F., Zelli, R. and Polisca, A. (2006). Doppler evaluation of maternal and fetal vessels during normal ges tation in the bitch. Res. Vet. Sci., 81: 382-388.
England, G.C.W., Edward Allen, W. and Porter, D.J. (1990). Studies on canine pregnancy using B-mode ultrasound: development of the conceptus and determination of gesta tional age. J. Small Anim. Pract., 31(7): 324-329.
Freitas, D.L.A., Mota, G.L., Silva, H.V.R., Carvalho, C.F., Silva, D.L.D.M. (2016). Can maternal-fetal hemodynamics influ ence prenatal development in dogs? Anim. Reprod. Sci., 172: 83-93.
George, J. (2012). Doppler and 3D/4D ultrasonographic studies on the development of conceptus in bitch. M.V.Sc. Thesis submitted to LUVAS, Hisar, India.
Giannico, A.T., Gil, E.M.U., Garcia, D.A.A. and Froes, T.R. (2016). The use of Doppler evaluation of the canine umbil ical artery in prediction of delivery time and fetal distress. Anim. Reprod. Sci., 154: 105-112.
Holen, J. (2014). Introduction to Vascular Ultrasonography. Radiology, 154: 1-6.
Miranda, S.A. and Domingues, S.F. (2010). Conceptus eco biom etry and triplex Doppler ultrasonography of uterine and umbilical arteries for assessment of fetal viability in dogs. Theriogenology, 74: 608-617.
Nautrup, C.P. (1998). Doppler ultrasonography of canine mater nal and fetal arteries during normal gestation. J. Reprod. Fertil., 112: 301-314.
Nogueira, I. B., Almeida, L. L., Angrimani, D. S. R., Brito, M. M., Abreu, R. A. and Vannucchi, C. I. (2017). Uterine haemo dynamic, vascularization and blood pressure changes along the oestrous cycle in bitches. Reprod. Domestic. Anim., 52: 52-57.
Osol, G. and Mandala, M. (2009). Maternal Uterine Vascular Remodeling During Pregnancy. Physiology, 24: 58-71.
Robson, S.C. (2000). Assessment of hemodynamics using Doppler ultrasound. Ultrasound Obstet. Gynecol., 15: 456- 459.
Simon, S. (2015). Conceptus ecobiometry and Doppler ultraso nographic assessment of maternal and foetal blood flow in canine pregnancy. Ph.D. thesis submitted to
The Gandhigram Rural Institute- Deemed University, Gandhigram, India.
Simon, S., Ramanathan, A. and Aravinda Ghosh, K.N. (2021). Doppler Ultrasonographic Assessment of Maternal and Foetal Blood Flow in Canine Pregnancy and Its Application in the Critical Management of Gestation. Indian J. Anim. Res., 50: 1-10.
