Effects of intratechal and intravenous fentanyl on body temperature in patients undergoing spinal anesthesia

Our study was designed to investigate the effects on intravenous and intrathecal fentanyl central temperature changes in patients undergoing spinal anesthesia. For this purpose elective arthroscopy, inguinal hernia, anal fissures, hemorrhoids, varicocele, hydrocele and planned operation under spinal anesthesia because of varicose veins excision ASA I and II, which 120 patients aged 20-60 were included in the study. Who were operated in emergency conditions, diabetes mellitus, dysautonomia syndrome, hyperthyroidism, use of central nervous system depressant and beta blockers, otitis media, ear surgery is undergoing and the application does not want such tympanoplasties were excluded from the study. Pre-set the room temperature of 24 oC after opening intravenous infusion fluids to patients in the operating room of 10 ml / kg / hour to be applied by heating at 37 ° C. All patients heart rate (HR), mean arterial blood pressure (MAP) was SpO2 monitoring. Central heat using a tympanic temperature probe for temperature changes were recorded with an interval of five minutes for 60 minutes. The patients were randomly divided into 3 groups. 12.5 mg of 0.5% bupivacaine heawy Group I, Group II, 12.5 mg to 12.5 mg of intrathecal bupivacaine and fentanyl heawy 0.5%, 0.5%, 12.5 mg of Group III heawy bupivacaine and 1 mg / kg of fentanyl were administered intravenously. Tympanic temperature decreased significantly compared to baseline in 5 minutes starting from the three groups (p <0.05, Figure I). In Group 3, tympanic temperature for 60 minutes according to Group 1 and 2 remained significantly lower (p <0.05, Figure I). All this equals time compared with control values of MAP and HR values in the first 10 minutes compared to baseline in all three groups were observed in MAP and HR decreased significantly (p <0.05). During the operation to be continued with low baseline it was stable and not significantly different between the groups in the data. In terms of side effects that occur between groups, no statistically significant difference. Spinal anesthesia with intravenous fentanyl in patients who were likely to fall more along with central heat effect (1,3oC) was found to be caused. None of the cases due to the fall in temperature of the measures taken to reduce heat loss in this study was not the clinical hypothermia. However, in terms of age groups at risk of hypothermia, adequate heat dissipation in the fact that preventive measures along with the intravenous administration of fentanyl, spinal anesthesia and surgery, it is important to be done in the long term monitoring of temperature at regular intervals. Key words: Hypothermia, spinal anesthesia, fentanyl