The effects of hyperglycemia on outcomes in surgical high-grade glioma patients.

•Hyperglycemia is prevalent and multi-factorial in post-operative glioma patients.•Post-operative hyperglycemia increases risk of serious post-operative complication.•Mean post-op glucose values >167 mg/dL increases risk of serious complication.•Mean post-op glucose values >163 mg/dL increases risk for 30-day readmissions.