Key result
Deep total intravenous anesthesia (response entropy 30-44) during laparoscopy significantly increased oxidative stress markers compared to lighter anesthesia (response entropy 45-59) (p<0.05).
Why the study?
Does deep anesthesia (RE 30-44) compared to lighter anesthesia (RE 45-59) during TIVA affect oxidative stress markers in adults undergoing laparoscopic operations?
RCT (n=20)
Randomly distributed
Does deep anesthesia (RE 30-44) compared to lighter anesthesia (RE 45-59) during TIVA affect oxidative stress markers in adults undergoing laparoscopic operations?
Deeper anesthesia during laparoscopic surgery is associated with higher levels of oxidative stress markers, suggesting increased anaerobic metabolism.
Answers are grounded in this paper and cite their sources.
May favor lighter TIVA depths during laparoscopy to limit oxidative stress; extends RCT data on anesthesia depth and metabolic markers.
BACKGROUND AND OBJECTIVES: Recent studies have correlated postoperative mortality with anesthetic mortality, especially with the depth of anesthesia and systolic blood pressure (SBP). The aim of this study is to evaluate the effects of the depth of total intravenous anesthesia (TIVA) using remifentanil and propofol, performed with monitoring of response entropy (RE) on blood concentrations of oxidative stress markers (TBARS and glutathione) during laparoscopic operations. METHOD: Twenty adult patients, ASA I, BMI 20-26 kg.m(-2), aged 20 to 40 years, were randomly distributed into two groups: Group I underwent anesthetic-surgical procedure with RE maintained between 45 and 59, and Group II underwent anesthetic-surgical procedure with RE between 30 and 44. In both groups, the remifentanil and propofol infusion was controlled by the effector site (Es), adjusted to maintain RE desired values (Groups I and II) and always assessing the suppression rate (SR). Patients were evaluated in six periods: M1 (immediately before anesthesia), M2 (before tracheal intubation [TI]), M3 (5-minutes after TI), M4 (immediately before pneumoperitoneum [PPT]), M5 (1-minute after PPT), and M6 (1-hour after the operation). The following parameters were assessed at all times: SBP, DBP, HR, RE, SR, TBARS, and glutathione. RESULTS: We found increases in TBARS and glutathione in M5, both in Group I and Group II (p<0.05), with higher values in Group II, and SR in three patients in Group II, immediately after PPT. CONCLUSIONS: Increased markers in Group I (M5) suggests an increase in anaerobic metabolism (AM) in the splanchnic circulation while the highest values seen in Group II (GII > GI in M5, p<0.05%) suggest interference of another factor (deep anesthesia) responsible for the increase in AM, probably as a result of increased autonomic nervous system depression and minor splanchnic self-regulation.
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Nunes et al. (2012) conducted an RCT in Laparoscopic operations (n=20). Total intravenous anesthesia with response entropy 30-44 vs. Total intravenous anesthesia with response entropy 45-59 was evaluated on Blood concentrations of oxidative stress markers (TBARS and glutathione) (p=<0.05). Deep total intravenous anesthesia (response entropy 30-44) during laparoscopy significantly increased oxidative stress markers compared to lighter anesthesia (response entropy 45-59) (p<0.05).
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