What is the efficacy and safety of q 30 minutes vs. q 1hour glucose sampling and intervention for an intensive insulin protocol to achieve and maintain euglycemia in non-diabetic patients undergoing craniotomy? The investigators hypothesize that in non-diabetic patients undergoing craniotomy, monitoring glucose and modifying insulin infusions every 30 minutes compared to every hour will help them reach target glucose levels faster and maintain them more efficiently with the same insulin protocol.
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performance of each of glucose sampling and insulin protocols for achieving euglycemia
Timeframe: duration of operation