alexa Intensive insulin therapy reduces microdialysis glucose values without altering glucose utilization or improving the lactate pyruvate ratio after traumatic brain injury.
Infectious Diseases

Infectious Diseases

Journal of AIDS & Clinical Research

Author(s): Vespa P, Boonyaputthikul R, McArthur DL, Miller C, Etchepare M, , Vespa P, Boonyaputthikul R, McArthur DL, Miller C, Etchepare M,

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Abstract OBJECTIVE: To determine that intensive glycemic control does not reduce microdialysis glucose concentration brain metabolism of glucose. DESIGN: Prospective monitoring followed by retrospective data analysis of cerebral microdialysis and global brain metabolism. SETTING: Single center, academic neurointensive care unit. PATIENTS: Forty-seven moderate to severe traumatic brain injury patients. INTERVENTIONS: A nonrandomized, consecutive design was used for glycemic control with loose insulin (n=33) for the initial 2 yrs or intensive insulin therapy (n=14) for the last year. MEASUREMENTS AND MAIN RESULTS: In 14 patients treated with intensive insulin therapy, there was a reduction in microdialysis glucose by 70\% of baseline concentration compared with a 15\% reduction in 33 patients treated with a loose insulin protocol. Despite this reduction in microdialysis glucose, the global metabolic rate of glucose did not change. However, intensive insulin therapy was associated with increased incidence of microdialysis markers of cellular distress, namely elevated glutamate (38+/-37\% vs. 10+/-17\%, p<.01), elevated lactate/pyruvate ratio (38+/-37\% vs. 19+/-26\%, p<.03) and low glucose (26+/-17\% vs. 11+/-15\%, p<.05, and increased global oxygen extraction fraction. Mortality was similar in the intensive and loose insulin treatment groups (14\% vs. 15\%, p=.9), as was 6-month clinical outcome (p=.3). CONCLUSIONS: Intensive insulin therapy results in a net reduction in microdialysis glucose and an increase in microdialysis glutamate and lactate/pyruvate without conveying a functional outcome advantage. This article was published in Crit Care Med and referenced in Journal of AIDS & Clinical Research

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