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Effect of lidocaine on the minimum alveolar concentration of sevoflurane in dogs
Authors:Lídia M Matsubara MV  MSc    Valéria N L S Oliva† MV  PhD    Daniela T Gabas MV  MSc    Guillermo C V Oliveira MV  & Maria L Cassetari‡ MSc
Institution:Department of Anesthesiology, Faculdade de Medicina, Botucatu, São Paulo, Brazil;Department of Clinics, Surgery and Animal Reproduction, Faculdade de Odontologia, Curso de Medicina Veterinária, Botucatu, São Paulo, Brazil;Department of Public Health, Faculdade de Medicina, Universidade Estadual Paulista, Botucatu, São Paulo, Brazil
Abstract:Objective  To investigate the effects of a low-dose constant rate infusion (LCRI; 50 μg kg?1 minute?1) and high-dose CRI (HCRI; 200 μg kg?1 minute?1) lidocaine on arterial blood pressure and on the minimum alveolar concentration (MAC) of sevoflurane (Sevo), in dogs.
Study design  Prospective, randomized experimental design.
Animals  Eight healthy adult spayed female dogs, weighing 16.0 ± 2.1 kg.
Methods  Each dog was anesthetized with sevoflurane in oxygen and mechanically ventilated, on three separate occasions 7 days apart. Following a 40-minute equilibration period, a 0.1-mL kg?1 saline loading dose or lidocaine (2 mg kg?1 intravenously) was administered over 3 minutes, followed by saline CRI or lidocaine LCRI or HCRI. The sevoflurane MAC was determined using a tail clamp. Heart rate (HR), blood pressure and plasma concentration of lidocaine were measured. All values are expressed as mean ± SD.
Results  The MAC of Sevo was 2.30 ± 0.19%. The LCRI reduced MAC by 15% to 1.95 ± 0.23% and HCRI by 37% to 1.45 ± 0.21%. Diastolic and mean pressure increased with HCRI. Lidocaine plasma concentration was 0.84 ± 0.18 for LCRI and 1.89 ± 0.37 μg mL?1 for HCRI. Seventy-five percent of HCRI dogs vomited during recovery.
Conclusion and clinical relevance  Lidocaine infusions dose dependently decreased the MAC of Sevo, did not induce clinically significant changes in HR or arterial blood pressure, but vomiting was common during recovery in HCRI.
Keywords:blood pressure  constant rate infusion  dog  lidocaine  minimum alveolar concentration  sevoflurane
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