Intensive insulin therapy in severe traumatic brain injury: a systematic review and meta-analysis of randomized controlled trials.
CCCF ePoster library. Haghbayan H. Oct 28, 2015; 117314; P67
Dr. Hourmazd Haghbayan
Dr. Hourmazd Haghbayan
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Abstract
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INTRODUCTION
Hyperglycaemia is common in acute severe traumatic brain injury (sTBI) and has been strongly correlated with neurotoxicity and unfavourable outcomes. Studies investigating intensive insulin therapy (IIT) in sTBI patients are sparse and consensus has not been achieved. We thus undertook a systematic review and meta-analysis of RCTs investigating the use of IIT in acute sTBI to determine the benefits and harms of maintaining strict normoglycaemia.

OBJECTIVES
To summarize the existing evidence on the benefits and harms of using intensive insulin therapy to maintain strict normalglycaemia in acute severe traumatic brain injury.

METHODS
We searched MEDLINE, EMBASE, CENTRAL and BIOSIS for RCTs comparing IIT with conventional insulin therapy (CIT). Primary outcomes were in-hospital and long-term (≥6 months) mortality and unfavourable neurological outcome (Glasgow outcome scale (GOS) 1-3 or extended GOS (eGOS) 1-4 at ≥6 months). Secondary outcomes included rate of hypoglycaemia, rate of ICU infection and ICU length of stay. Results were pooled and presented as relative risks (RR) with 95% confidence intervals (95% CI) using random-effects models.

RESULTS
We identified 2 848 records, of which 3 (n=416) studies met inclusion criteria. Maintenance of normoglycaemia in acute sTBI with IIT does not reduce mortality during hospitalization (3 studies, n=416, RR=1.02, 95% CI 0.73 to 1.42, I2=0%) or at 6 months (3 studies, n=408, RR=0.97, 95% CI 0.78 to 1.22, I2=0%) when compared to CIT. However, the use of IIT is associated with a statistically non-significant reduction of unfavourable GOS (3 studies, n=409, RR=0.91, 95% CI 0.80 to 1.03, I2=0%). Patients under IIT have significantly reduced ICU infection rates. The incidences of both standard (≤ 80 mg/dL) and severe hypoglycaemia (≤ 40 mg/dL) are higher in IIT arms, though neither analysis is statistically significant.

CONCLUSIONS
There is no difference between in-hospital or long-term mortality of acute sTBI patients treated with IIT compared to those treated under CIT. IIT may possibly result in modestly reduced morbidity, but this analysis did not reach statistical significance. The rate and impact of hypoglycaemia in IIT is unclear and further RCTs are required to adequately evaluate the benefits and harms of IIT before its clinical implementation in acute sTBI management.
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