JOURNAL OF FELINE MEDICINE AND SURGERY, no.8, pp.1-5, 2015 (Journal Indexed in SCI Expanded)
Objectives The objective was to investigate postpartum uterus involution by real-time ultrasonography and vaginal
cytology in Van cats.
Methods This study included 15 healthy Van cats belonging to the Van Cat Research Centre (Yuzuncu Yil University,
Van, Turkey). Starting 24 h postpartum, ultrasonographic measurements were performed on the placental and
interplacental uterine horn regions every day. Decreases in the diameters and uterine content were considered as
criteria for uterine involution. Vaginal discharge samples were collected every day for 4 weeks postpartum. The
smears were stained with Papanicolaou stain.
Results The average diameters of placental and interplacental regions (IPRs) in the uterine horns were 3.12 ± 0.29 cm
and 2.36 ± 0.43 cm, respectively, at 24 h postpartum. Placental regions (PRs) shrank faster than IPRs. At 48 h
postpartum, it became difficult to distinguish PRs from IPRs in the uterine horns. The uterine horns could be seen in
the abdominal cavity up to 5.60 ± 0.99 days postpartum. The mean of the last assessable diameter of the uterine
horns from days 4 to 7 in all cats was 0.49 ± 0.07 cm. The vaginal epithelial cells appeared to be under the effect
of oestrogen for 4 weeks postpartum.
Conclusions and relevance The morphological involution of the uterus completes, to a large extent, within the first
48 h postpartum in Van cats. A more detailed hormonal analysis would contribute greatly to the understanding of
the physiological processes involved in this period. Although postpartum involution appeared complete by the
5.60 ± 0.99 day after parturition in Van cats, histological verification of this finding is needed.