Peer-reviewed veterinary case report
Blood pressure and heart rate during pyometra surgery in dogs
By Höglund, Odd Viking et al.·Published in Acta veterinaria Scandinavica·2016·Department of Clinical Sciences·View original on PubMed →
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Original publication title: Blood pressure and heart rate during ovariohysterectomy in pyometra and control dogs: a preliminary investigation.
- Species:
- dog
Plain-English summary
A group of dogs, including eight with a serious uterine infection called pyometra, underwent surgery to remove their reproductive organs. During the surgery, their blood pressure and heart rate were monitored to see how they responded to the stress of the procedure. Both groups showed an increase in blood pressure during a specific part of the surgery, but overall, there were no significant differences in how the dogs with pyometra reacted compared to healthy dogs. This suggests that while surgery is stressful, the physiological responses were similar in both groups.
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Abstract
BACKGROUND: Surgery causes a stress response, a physiologic response to trauma. The intraoperative surgical stress response in dogs diagnosed with pyometra has not previously been described. The aim of this study was to investigate the intraoperative surgical stress response, assessed by blood pressure and heart rate measurements, in dogs diagnosed with pyometra and healthy controls. All dogs were premedicated with acepromazine and methadone, anaesthesia was induced with propofol and maintained with isoflurane, where after the dogs were subjected to ovariohysterectomy. RESULTS: Eight dogs diagnosed with pyometra and eight healthy controls were used. Systolic blood pressure and heart rate were measured to assess the surgical stress response. Additionally propofol dosage at induction of anaesthesia and the end-tidal isoflurane concentration were investigated. The surgery was split into four phases. Phase 0 was the period 10 min before the skin incision, phase 1 was skin incision and opening of abdomen, phase 2 was manipulation of uterine horns, lifting of the ovary with stretching of the mesovarium, ligation and transection of mesovarium and phase 3 was ligation and transection of cervix, removal of organs and closing of the abdomen. Dosage of propofol at induction of anaesthesia was 3.6 ± 1 mg/kg in dogs with pyometra and 4.1 ± 1 in healthy controls (P = 0.37). In both groups, systolic blood pressure increased between phase 1 and 2, from 87 ± 15 to 114 ± 19 mmHg in dogs with pyometra, and from 88 ± 18 to 106 ± 20 mmHg in healthy controls, (both P < 0.0001). Systolic blood pressure did not differ significantly between groups in any of the phases. Heart rate and end-tidal concentration of isoflurane did not differ significantly between phases or between groups. CONCLUSIONS: The increased blood pressure at removal of ovaries during ovariohysterectomy suggests a pronounced noxious stimulus at this part of the procedure. In principle, the study parameters and response to surgery did not differ significantly between dogs with pyometra and healthy controls.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/27855712/