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  • Title: Comparison of intraperitoneal ropivacaine and bupivacaine for postoperative analgesia in dogs undergoing ovariohysterectomy.
    Author: Lambertini C, Kluge K, Lanza-Perea M, Bruhl-Day R, Kalchofner Guerrero KS.
    Journal: Vet Anaesth Analg; 2018 Nov; 45(6):865-870. PubMed ID: 30301661.
    Abstract:
    OBJECTIVE: To compare postoperative analgesia following either intraperitoneal (IP) ropivacaine or bupivacaine in dogs undergoing ovariohysterectomy (OVH) in the scope of multimodal analgesia. STUDY DESIGN: Prospective, randomized, blinded clinical study. ANIMALS: A total of 45 privately owned dogs undergoing OVH, aged 37 ± 28 months and weighing 11.3 ± 4.5 kg. METHODS: Dogs were premedicated with acepromazine (0.05 mg kg-1) and morphine (0.5 mg kg-1) intramuscularly (IM). Anaesthesia was induced with alfaxalone and maintained with isoflurane in oxygen. Carprofen (4 mg kg-1) was injected subcutaneously after intubation. Dogs were randomly assigned to receive either bupivacaine (group B; 3 mg kg-1) or ropivacaine (group R; 3 mg kg-1) IP prior to complete closure of the linea alba. At 0.5, 1, 2, 4, 6 and 8 hours after extubation, sedation and postoperative pain were assessed, using the short form of the Glasgow Composite Pain scale (GCPS-SF), a dynamic interactive visual analogue scale (DIVAS), and mechanical nociceptive threshold (MNT) measurement. Rescue morphine (0.2 mg kg-1) was administered in case of ≥ 5/20 or ≥ 6/24 in the GCPS-SF and/or >40 mm in the DIVAS. Parametric data were compared using the t test; nonparametric data were analysed with the two-sample Wilcoxon test (p < 0.05). RESULTS: The GCPS-SF score was significantly higher in group R at 8 hours. There was no other significant difference regarding sedation or analgesia between the groups. Rescue analgesia was administered to 15 dogs (R: 9/22; B: 6/22), with no significant difference between the groups. MNT values decreased in both groups at all time points when compared to baseline. No adverse effects were observed. CONCLUSIONS AND CLINICAL RELEVANCE: Ropivacaine or bupivacaine IP in combination with morphine IM and carprofen SC provided comparable postoperative analgesia in dogs after OVH for 6 hours. However, the anaesthetic protocol used did not prevent the administration of rescue analgesia in 41% of animals.
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