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- W2399687772 abstract "Objective To determine plasma bupivacaine concentrations after retrobulbar or peribulbar injection of bupivacaine in cats. Study design Randomized, crossover, experimental trial with a 2 week washout period. Animals Six adult healthy cats, aged 1–2 years, weighing 4.6 ± 0.7 kg. Methods Cats were sedated by intramuscular injection of dexmedetomidine (36–56 μg kg−1) and were administered a retrobulbar injection of bupivacaine (0.75 mL, 0.5%; 3.75 mg) and iopamidol (0.25 mL), or a peribulbar injection of bupivacaine (1.5 mL, 0.5%; 7.5 mg), iopamidol (0.5 mL) and 0.9% saline (1 mL) via a dorsomedial approach. Blood (2 mL) was collected before and at 5, 10, 15, 22, 30, 45, 60, 120, 240 and 480 minutes after bupivacaine injection. Atipamezole was administered approximately 30 minutes after bupivacaine injection. Plasma bupivacaine and 3-hydroxybupivacaine concentrations were determined using liquid chromatography–mass spectrometry. Bupivacaine maximum plasma concentration (Cmax) and time to Cmax (Tmax) were determined from the data. Results The bupivacaine median (range) Cmax and Tmax were 1.4 (0.9–2.5) μg mL−1 and 17 (4–60) minutes, and 1.7 (1.0–2.4) μg mL−1, and 28 (8–49) minutes, for retrobulbar and peribulbar injections, respectively. In both treatments the 3-hydroxybupivacaine peak concentration was 0.05–0.21 μg mL−1. Conclusions and clinical relevance In healthy cats, at doses up to 2 mg kg−1, bupivacaine peak plasma concentrations were approximately half that reported to cause arrhythmias or convulsive electroencephalogram (EEG) activity in cats, and about one-sixth of that required to produce hypotension." @default.
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- W2399687772 date "2017-01-01" @default.
- W2399687772 modified "2023-09-27" @default.
- W2399687772 title "Plasma bupivacaine concentrations following orbital injections in cats" @default.
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- W2399687772 doi "https://doi.org/10.1111/vaa.12388" @default.
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