Serum glial cell line–derived neurotrophic factor levels and postoperative cognitive dysfunction after surgery for rheumatic heart disease

Abstract

ObjectivePostoperative cognitive dysfunction is an important complication of cardiac surgery with poor outcomes. Serum glial cell line–derived neurotrophic factor levels are decreased in patients with Alzheimer's disease, but the association between glial cell line–derived neurotrophic factor levels and postoperative cognitive dysfunction is poorly understood. The present study aimed to investigate the prognostic value of postoperative serum glial cell line–derived neurotrophic factor levels to predict postoperative cognitive dysfunction in patients with rheumatic heart disease undergoing heart valve replacement. MethodsThis was a prospective observational study of 80 patients undergoing elective heart valve replacement surgery from June 2015 to June 2016 at the Affiliated Hospital of Southeast Medical University. Cognitive functions were assessed 1 day before and 7 days after surgery. Serum glial cell line–derived neurotrophic factor levels were measured by an enzyme-linked immunosorbent assay before (T1) and 1 (T2), 2 (T3), and 7 (T4) days after surgery. Perioperative parameters were evaluated to assess the relationship between glial cell line–derived neurotrophic factors and postoperative cognitive dysfunction. ResultsPostoperative cognitive dysfunction was identified in 38 patients (47.5%) 7 days after surgery. Average glial cell line–derived neurotrophic factor levels at 2 and 7 days after surgery in the postoperative cognitive dysfunction group were lower than in the nonpostoperative cognitive dysfunction group at the same time points (P < .001). ΔGlial cell line–derived neurotrophic factor (T1-T3) and Δglial cell line–derived neurotrophic factor (T1-T4) were identified as good predictors of postoperative cognitive dysfunction with threshold for postoperative cognitive dysfunction detection of 49.10 and 60.90, respectively. ConclusionsThe perioperative glial cell line–derived neurotrophic factor levels in patients with postoperative cognitive dysfunction were lower than in patients without postoperative cognitive dysfunction. Glial cell line–derived neurotrophic factor could be an effective predictor for the occurrence of postoperative cognitive dysfunction. The results reveal a potentially important role of decreased glial cell line–derived neurotrophic factor levels in postoperative cognitive dysfunction, with possible treatment targets.