Physiological responses of jundiá Rhamdia quelen juveniles anesthetized with different concentrations of lidocaine hydrochloride (Lidostesim® 3%)

Abstract

The aim of this trial was to determine the effect of lidocaine hydrochloride-based immersion anesthesia in concentrations of 1,000, 1,500, 2,000 and 2,500 mg L-1 on physiological responses of jundiá Rhamdia quelen, with the control group anesthetized with clove oil (50 mg L-1) bath anesthesia. Ten jundiá juveniles were used in each experimental and control groups in order to analyze the hematocrit, blood glucose levels and induction and recovery times. Jundiás anesthetized in 2,000 and 2,500 mg L-1 solutions showed percentual hematocrit increase (42.7 ± 0.9% and 43.7 ± 0.7 %, P < 0.05). It was observed inverse association between blood glucose levels and lidocaine concentration, with values ranging from 57.3 ± 14.7 mg dL-1 to jundiá anesthetized in 1,000 mg L-1 and 39.5 ± 12.5 mg dL-1 in 2,500 mg L-1 anesthetic baths, with higher values detected in the control group (78.1 ± 12.5 mg dL-1, P < 0.001). Likewise, it was observed inverse relationship between lidocaine hydrochloride concentration and induction times, but direct association with recovery times. Higher concentrations were the most effective as blood glucose reduction and maintenance of hematocrit levels, with promising induction and recovery times for future anesthetic trials.