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In a randomized controlled trial comparing tight glucose control with a computerized decision support system and conventional protocols ( post hoc  analysis), we tested the hypothesis that hypoglycemia is associated with a poor outcome, even when controlling for initial severity.    Methods  We looked for moderate (2.2 to 3.3 mmol/L) and severe (<2.2 mmol/L) hypoglycemia, multiple hypoglycemic events (n ≥3) and the other main components of glycemic control (mean blood glucose level and blood glucose coefficient of variation (CV)). The primary endpoint was 90-day mortality. We used both a multivariable analysis taking into account only variables observed at admission and a multivariable matching process (greedy matching algorithm; caliper width of 10 −5  digit with no replacement).    Results  A total of 2,601 patients were analyzed and divided into three groups: no hypoglycemia (n =1,474), moderate hypoglycemia (n =874, 34%) and severe hypoglycemia (n =253, 10%). Patients with moderate or severe hypoglycemia had a poorer prognosis, as shown by a higher mortality rate (36% and 54%, respectively, vs. 28%) and decreased number of treatment-free days. In the multivariable analysis, severe (odds ratio (OR), 1.50; 95% CI, 1.36 to 1.56;  P  =0.043) and multiple hypoglycemic events (OR, 1.76, 95% CI, 1.31 to 3.37;  P  <0.001) were significantly associated with mortality, whereas blood glucose CV was not. Using multivariable matching, patients with severe (53% vs. 35%;  P  <0.001), moderate (33% vs. 27%;  P  =0.029) and multiple hypoglycemic events (46% vs. 32%,  P  <0.001) had a higher 90-day mortality.    Conclusion  In a large cohort of ICU patients, severe hypoglycemia and multiple hypoglycemic events were associated with increased 90-day mortality.    Trial registration  Clinicaltrials.gov Identifier:  NCT01002482 . Registered 26 October 2009.

Severe and multiple hypoglycemic episodes are associated with increased risk of death in ICU patients