Tratamento convencional versus eletroacupuntura para reversão de hipotensão arterial em cavalos sob anestesia geral inalatória

Abstract

This study aimed to evaluate the efficacy of dobutamine comparatively with electroacupuncture and sham treatment to reversion of isoflurano-induced hypotension in equine. Six adult horses were evaluated using a crossover design with at least 15 days between treatments. All the horses were medicated with xylazine (0.5mg kg-1) by intravenous administration (iv). Guaifenesin (100mg/kg iv) and thiopental (5mg kg-1 iv) were administered, following the inhalation anesthesia with isoflurane. The horses were positionated in left lateral recumbency and they were maintained in mechanical ventilation. After anesthesia was established, the isoflurane concentration was raised until mean blood pressure was maintained between 40 to 45mmHg. After that, the animals were treated with a constant rate of 1.5mg kg -1min-1 intravenously dobutamine (DOB), electroacupunture to PC6 acupoint (EA) and sham treatment (Sham). All the treatments were maintained for 60 minutes. Heart rate, cardiac rhythms, median arterial blood pressure, rectal temperature, arterial blood gases, creatine kinase (CK), aspartate transaminase (AST), recovery time and quality of recovery were investigated. The mean blood pressure increased 50%, 36.5% and 7.5%% in DOB, EA and Sham treatment, respectively. Higher values were observed in the DOB treatment when compared with Sham treatment at 10, 20, 30 and 40 minutes and at 20 minutes when compared with EA treatment. Heart rate, blood gases, CK, AST, recovery time and quality of recovery did not differ among the treatments. It was concluded that the dobutamine treatment was more effective than electroacupuncture and Sham tretament for the reversion of isoflurane induced hypotension in horses.