Influence of total intravenous anesthesia, entropy and laparoscopy on oxidative stress.
OBJECTIVE
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.


METHODS
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.
Hospital São Carlos, Fortaleza, CE, Brazil. rogean@fortalnet.com.br
Rogean Rodrigues
RR
Nunes
Fernando Squeff
FS
Nora
Danielle Maia Holanda
DM
Dumaresq
Rute Maria Araújo
RM
Cavalcante
Amanda Antunes
AA
Costa
Lara Moreira Mendes
LM
Carneiro
Julio Cesar Garcia de
JC
Alencar
Flávia Pereira Fernandes
FP
Cardoso
D000328:Adult; D000768:Anesthesia, General; D000771:Anesthesia, Intravenous; D018686:Anesthetics, Intravenous / Q000494:pharmacology*; D019277:Entropy; D005260:Female; D006801:Humans; D010535:Laparoscopy; D015227:Lipid Peroxidation / Q000187:drug effects*; D018384:Oxidative Stress / Q000187:drug effects*; D010880:Piperidines / Q000494:pharmacology*; D015742:Propofol / Q000494:pharmacology*; D011446:Prospective Studies; D000077208:Remifentanil; D055815:Young Adult
D018686:Anesthetics, Intravenous; D010880:Piperidines; D000077208:Remifentanil; D015742:Propofol