[Macroscopic infrared analysis of inhaled nitrous oxide diffusion to abdominal cavity in rats submitted to pneumoperitoneum.].

Background And Objectives: Nitrous oxide (N2O), for its tri-atomic asymmetric structure, has high energy emission and absorption characteristics within the infrared spectrum, with maximum absorption at 4.5 microm, what makes it visible at short infrared, when contrasted with a heat emission source (hot support). Many authors have described N2O diffusion to closed cavities by chromatography methods and gas analyzers, which do not allow a detailed macroscopic study of the gas.

[Analysis of heat loss using inhalation agents in rats subjected to laparotomy and increased intra-abdominal pressure, using digital infrared thermal image].

Background And Objectives: Anesthesiology involves the handling of situations inherent to anesthetic and surgical procedures which lead to patients thermal homeostasis unbalance, with noxious physiological effects. This study aimed at qualifying and quantifying thermal redistribution in rats subjected to inhalation anesthesia, during induction and in surgical situations of laparotomy and increased intra-abdominal pressure.

Methods: The study involved 90 rats, submitted to inhalation anesthesia, which were distributed in three groups: halothane; isoflurane; sevoflurane.