Haemodynamic changes in uterine artery in pregnant, nonpregnant and pyometra affected bitches

Ten no. of non-pregnant bitches in diestrous phase (control group /Group I) were selected along with 120 nos of pregnant bitches (Group II) and 10 nos of bitches showing symptoms of pyometra (Group III) were selected for study of haemodynamics parameters of uterine artery. In pregnant healthy bitches the indices (PSV and EDV) of uterine artery increased progressively with the evolution of pregnancy. RI values found in case of normal dioestrus and pregnant bitches were higher than that of pyometric group bitches. The mean systolic peak velocity in canine uterine artery of nonpregnant dioestrus bitches was 20 cm/s. RI values were ranging between1 - 1.52 (mean of RI =1.280). There is significant difference in the haemodynamic parameters between pregnant and non pregnant animal. PSV and EDV of pregnant animal is comparatively higher than non pregnant dioestrus bitches, but RI value of NP bitches were higher than pregnant bitches and PI values were almost zero. Normal dioestrus and pregnant bitches showed lower blood flow velocities and higher hemodynamic indices when compared to pyometra groups. The blood flow in the uterine artery increases significantly during pyometra and pregnancy which can be used as an important parameter for evaluation of reproductive functionality of bitches.