Risk factors for hypoglycaemia in neurocritical care patients
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Purpose To identify risk factors for hypoglycaemia in neurocritical care patients receiving intensive insulin therapy (IIT). Methods We performed a nested case–control study. All first episodes of hypoglycaemia (glucose <80?mg/dL, <4.4?mmol/L) in neurocritical care patients between 1 March 2006 and 31 December 2007 were identified. Patients were treated according to the local IIT protocol, with target blood glucose levels between 4.5 and 6.0?mmol/L (81.0-08.0?mg/dL). The first hypoglycaemic event of every patient (index moment) was used to match to a control patient. Possible risk factors preceding the index moment were scored using hospital records and analysed with conditional logistic regression. Results Of 786 neurocritical care patients, 449 developed hypoglycaemia (57.1?%). Independent risk factors for hypoglycaemia were lowering nutrition 6?h before the index moment without insulin dose reduction (odds ratio (OR) 5.25, 95?% confidence interval (95?% CI) 1.32-0.88), mechanical ventilation (OR 2.59, 95?% CI 1.56-.29), lowering the dosage of norepinephrine 3?h before the index moment (OR 2.44, 95?% CI 1.07-.55), a hyperglycaemic event (>10?mmol/L,?>180.0?mg/dL) in the 24?h preceding the index moment (OR 2.40, 95?% CI 1.26-.58), gastric residual in the 6?h preceding the index moment without insulin dose reduction (OR 1.76, 95?% CI 1.05-.96) and dosage of insulin at the index moment (OR 0.83, 95?% CI 0.76-.90). Conclusion Hypoglycaemia occurs in a considerable proportion of neurocritical care patients. We recommend the identification of these risk factors in these patients to avoid the occurrence of hypoglycaemia.

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