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Intensive Insulin Therapy in Mixed Medical/Surgical Intensive Care Units

Benefit Versus Harm

¹ Department of Intensive Care Medicine, Catholic University of Leuven, Leuven, Belgium
² Department of Medicine, Catholic University of Leuven, Leuven, Belgium
³ Department of Physical Medicine and Rehabilitation, Catholic University of Leuven, Leuven, Belgium

Address correspondence and reprint requests to Greet Van den Berghe, MD, PhD, Department of Intensive Care Medicine, University Hospital Gasthuisberg, University of Leuven, B-3000 Leuven, Belgium. E-mail: greta.vandenberghe{at}med.kuleuven.be

Abbreviations: EMG, electromyography; ICU, intensive care unit; IIT, intensive insulin therapy

Intensive insulin therapy (IIT) improves the outcome of prolonged critically ill patients, but concerns remain regarding potential harm and the optimal blood glucose level. These questions were addressed using the pooled dataset of two randomized controlled trials. Independent of parenteral glucose load, IIT reduced mortality from 23.6 to 20.4% in the intention-to-treat group (n = 2,748; P = 0.04) and from 37.9 to 30.1% among long stayers (n = 1,389; P = 0.002), with no difference among short stayers (8.9 vs. 10.4%; n = 1,359; P = 0.4). Compared with blood glucose of 110–150 mg/dl, mortality was higher with blood glucose >150 mg/dl (odds ratio 1.38 [95% CI 1.10–1.75]; P = 0.007) and lower with <110 mg/dl (0.77 [0.61–0.96]; P = 0.02). Only patients with diabetes (n = 407) showed no survival benefit of IIT. Prevention of kidney injury and critical illness polyneuropathy required blood glucose strictly <110 mg/day, but this level carried the highest risk of hypoglycemia. Within 24 h of hypoglycemia, three patients in the conventional and one in the IIT group died (P = 0.0004) without difference in hospital mortality. No new neurological problems occurred in survivors who experienced hypoglycemia in intensive care units (ICUs). We conclude that IIT reduces mortality of all medical/surgical ICU patients, except those with a prior history of diabetes, and does not cause harm. A blood glucose target <110 mg/day was most effective but also carried the highest risk of hypoglycemia.

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