Outcomes of hyperglycemia in patients with and without diabetes hospitalized for infectious diseases.

Objective: To examine the prognostic implications of diabetes mellitus (DM) and the importance of glycemic control during hospitalization for infectious diseases.

Methods: Historical prospectively collected data of patients hospitalized between 2011 and 2013. Infection-related hospitalizations were classified according to site of infection. Median follow-up was 4.5 years. Outcome measures included in-hospital and end-of-follow-up mortality.

Results: The cohort included 8051 patients (50% female, mean age ± SD, 68 ± 20 years) with a primary diagnosis of an infectious disease. Of these, 2363 patients (29%) had type 2 DM. The most common infectious sites included respiratory tract (n = 3285), genitourinary tract (n = 1804), skin and soft tissue (n = 934) and gastrointestinal tract (n = 571). There was no difference in admission rates of patients with and without DM according to the site of infection, except for skin and soft tissue infection which were more common among patients with DM (16% vs 10%). In-hospital mortality risk was greater in patients with DM (aOR = 1.3, 95% CI = 1.1-1.7). In the entire cohort, adjusted mortality risk (aHR, 95% CI) at the end-of-follow-up was greater among patients with DM (1.2, 1.1-1.4), with increased mortality risk following hospitalization for respiratory (1.1, 1.0-1.4) and skin and soft tissue infections (1.7, 1.3-2.3). In-hospital and end-of-follow-up mortality risk were highest among patients with and without DM with median glucose >180 mg/dL during hospitalization.

Conclusions: In patients hospitalized for infectious diseases, DM is associated with increased long-term mortality risk, specifically following hospitalization for respiratory and skin and soft tissue infections. Poor glycemic control during hospitalization is associated with increased long-term mortality.