Stress insulin resistance is a marker for mortality in traumatic brain injury

The Journal of Trauma
Nathan T MoweryAddison K May

Abstract

Both hyper- and hypoglycemia have been associated with poor outcome in traumatic brain injury (TBI). Neither the risks nor benefit of tight glucose control (goal range, 80-110 mg/dL) have been documented in the TBI population. To analyze whether densely collected blood glucose data, using a computerized algorithm, to maintain tight glycemic control will reveal significant differences in blood glucose control between survivors and nonsurvivors in patients with TBI. From October 2005 to April 2006, all ventilated, critically ill surgical patients with TBI Abbreviated Injury Scale score of >or=3 were placed on an automated, euglycemia protocol with every 2-hour blood glucose sampling. Mortalities within 24 hours were excluded. The protocol calculates the insulin rate using a linear equation (rate = blood glucose - 60[M]). M is an adapting multiplier and used here as a marker for insulin resistance (IR). Of 1,636 trauma intensive care unit admissions 160 patients, (median Injury Severity Score 34, mortality 13.1%) had 10,071 samples collected. Median glucose 115.6 mg/dL, with 41% of values between 80 and 110 mg/dL, 81% between 80 and 150 mg/dL, and 0.3% <40 mg/dL. The median blood glucose was statistically different but not clinica...Continue Reading

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