اثر انفوزيون سريع مايعات كريستالوييد وريدي با دماي اتاق در بروز هيپوترمي خفيف

The effect of rapidly infused intravenous crystalloid fluids on occurrence of perioperative mild hypothermia

Background: Hypothermia frequently accompanies general and regional anesthesia and can be associated with adverse postoperative outcomes including wound infection, coagulopathy, morbid cardiac events as well as reduction of drug metabolism and shivering. Surgical patients become hypothermic because of redistribution of heat within the body due to anesthetic-induced vasodilation and as a result of exposure to a cold operating environment, instillation of cool fluids into body cavities and inhibition of thermoregulatory response by anesthetics. In addition, intravenous infusion of cold blood or room temperature fluids aggravates hypothermia. Thus, prevention of perioperative hypothermia should be considered seriously. The goal of this study was to assess the effect of intravenous infusion of room temperature crystalloid solution on the core and the surface body temperatures prior to administration of regional anesthesia. Materials and methods: This prospective descriptive and cross sectional study was performed on eighty healthy pregnant women who were scheduled for elective cesarean section under regional anesthesia. In the operating room, before administration of anesthesia, patientsʹ core and skin temperatures as well as temperature of the intravenous fluids were measured. Then lOml/kg room temperature ringer solution was infused rapidly (10ml / kg / 15min) and body temperatures were re-evaluated subsequently. Results: Age of patients was 28.37±4.07 years (range: 20 to 37 years) and temperature of intravenous ringer solutions was 23.48±0.08OC. Patientsʹ core and skin body temperatures significantly reduced after rapid infusion of fluids by 0.5 ± 0.12oC and 0.6±0.31OC, respectively (p=0.001) Conclusion: Infusion of room temperature intravenous fluids results in the occurrence of perioperative mild hypothermia.