Effects of anesthetic method on inflammatory response in patients with Parkinson's disease: a randomized controlled study.

Background: The pathogenesis of Parkinson's disease (PD) involves degeneration of dopaminergic neurons, which is influenced by innate and adaptive immunity. IL-17 is a characteristic cytokine secreted by Th17 cells, which acts as a powerful stimulator of neutrophil migration and infiltration and promotes the secretion of inflammatory cytokines. General anesthesia and surgical stress induce immune and inflammatory responses that activate the immunosuppressive mechanism in the perioperative period. The present study investigated changes in levels of inflammatory cytokines, such as IL-17, IL-1β, and TNF-α, in patients with PD undergoing general anesthesia with inhalational anesthetics or TIVA.

Methods: Adult patients, aged 40-75 years, scheduled for cerebral stimulator implantation were enrolled. Upon arrival at the operating theater, patients were allocated to the inhalational (I) or TIVA (T) group using block randomization. In group I, anesthesia was induced by tracheal intubation 1-2 min after intravenous administration of propofol (1-2 mg/kg) and rocuronium (0.6-1 mg/kg). Thereafter, anesthesia was maintained with 1-2 vol% sevoflurane, 0.01-0.2 μg/kg/min remifentanil, and O/air (FiO 0.4). In group T, propofol (3-6 μg/mL), remifentanil (2-6 ng/mL), and rocuronium (0.6-1 mg/kg) were administered using target controlled infusion (TCI) for induction of anesthesia. Blood samples were obtained preoperatively (T0), 2 h after induction of anesthesia (T1), and 24 h after surgery (T2). IL-17, IL-1β, and TNF-α levels were evaluated by ELISA.

Results: Serum levels of IL-17 were elevated at T2 in group I compared to group T but the difference was not statistically significant. IL-1β tended to be greater in group I compared to group T, but the differences were not significant. TNF-α was slightly higher at all time points in group T and showed a tendency to increase at T2 in both groups, but this was not statistically significant.

Conclusions: TIVA may be useful for inhibiting neuroinflammation by inhibiting the increase in serum levels of IL-17 24 h after implantation surgery. Serum IL-17 level may be used as a biomarker for PD progression.

Trial Registration: Clinical Research Information Service of Korea National Institute of Health (CRIS) Identification number: KCT0002061 . Registered 25 October 2019 - Retrospectively registered, https://cris.nih.go.kr/cris/search/search_result_st01.jsp?seq=15125.