Glycemic control in critically ill patients with or without diabetes

Area of Science:

• Critical care medicine
• Endocrinology
• Clinical research

Background:

• Early studies suggested tight glucose control benefits critically ill patients.
• The NICE-SUGAR trial indicated tight control increased mortality.
• Optimal glycemic targets for diabetic and non-diabetic patients remain uncertain.

Purpose of the Study:

• To evaluate the association between blood glucose levels and hospital mortality in critically ill patients.
• To compare glycemic control outcomes in patients with and without diabetes.

Main Methods:

• Retrospective analysis of the eICU database involving 52,107 patients.
• Exclusion criteria included repeat ICU stays, short ICU stays, and insufficient glucose measurements.
• Generalized additive models were used to assess the relationship between time-weighted average glucose and mortality, adjusting for covariates.

Main Results:

• Non-diabetic patients showed a J-shaped glucose-mortality curve; diabetic patients had a flattened, right-shifted curve.
• Higher time-weighted average glucose levels were associated with significantly increased mortality in non-diabetics compared to diabetics.
• Both hypoglycemia and glucose variability increased mortality, with a lesser impact in diabetic patients.

Conclusions:

• Time-weighted average glucose, hypoglycemia, and glucose variability impact outcomes differently in diabetic versus non-diabetic patients.
• Diabetic patients exhibit a blunted response to glycemic extremes and variability.
• Glycemic management strategies require re-evaluation to balance risks of hypo- and hyperglycemia.