The aim of this descriptive study was to monitor the changes in uterine arteries during pregnancy, postpartum period and pyometra in bitches using angiography. Fifteen uteri of mixed breed bitches on days 24, 30, 33, 40, 43, 47, 50 and 56 of pregnancy and weeks 1, 2, 3, 4 and 7–8 of postpartum and two CEH/pyometra bitches were examined after ovariohysterectomy. The results showed that with the onset of normal pregnancy and in about 30 ± 1 days of gestation, anastomoses begin to form between the left and right middle uterine arteries, developing during the next days and continuing until 4 weeks postpartum. On 4th week after parturition, when physiologic changes occur and the uterus returns to non‐pregnant conditions, these anastomoses begin to degenerate, and they completely disappear approximately on the 7th–8th week after parturition. Similarly, in CEH/pyometra bitches, anastomoses were formed between left and right median uterine arteries. These findings can be considered as a part of the physiological changes of the uterus and its vessels during pregnancy and postpartum periods and could affect the results and interpretation of relevant findings.

中文翻译：

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母犬妊娠期、产后期和 CEH/子宫蓄脓期子宫动脉的描述性血管造影研究

这项描述性研究的目的是使用血管造影术监测母犬在怀孕、产后和子宫蓄脓期间子宫动脉的变化。在妊娠第 24、30、33、40、43、47、50 和 56 天和产后第 1、2、3、4 和 7-8 周检查了 15 只混种母犬的子宫，并在卵巢子宫切除术后检查了 2 只 CEH/子宫蓄脓母犬. 结果显示，随着正常妊娠的开始，大约在妊娠 30±1 天左右，左右子宫中动脉之间开始形成吻合，并在接下来的几天内形成并持续到产后 4 周。分娩后第 4 周，当子宫发生生理变化，恢复到非妊娠状态时，这些吻合口开始退化，大约在分娩后第 7-8 周完全消失。相似地，在 CEH/子宫蓄脓性母犬中，左右子宫正中动脉之间形成吻合。这些发现可以被认为是妊娠期和产后子宫及其血管生理变化的一部分，并可能影响相关发现的结果和解释。