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Original Research

Hypoglycemia, With or Without Insulin Therapy, Is Associated With Increased Mortality Among Hospitalized Patients

  1. Rajesh Garg, MD⇑,
  2. Shelley Hurwitz, PHD,
  3. Alexander Turchin, MD, MS and
  4. Apoorva Trivedi, BS
  1. Division of Endocrinology, Diabetes, and Hypertension; and the Center for Clinical Investigation, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
  1. Corresponding author: Rajesh Garg, rgarg{at}partners.org.
Diabetes Care 2013 May; 36(5): 1107-1110. https://doi.org/10.2337/dc12-1296
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Abstract

OBJECTIVE Hypoglycemia is associated with increased mortality in hospitalized patients. We investigated the relationship between spontaneous hypoglycemia versus insulin-associated hypoglycemia and mortality in hospitalized patients.

RESEARCH DESIGN AND METHODS Data for this retrospective cohort study were obtained from electronic databases of patients admitted between 1 April 2008 and 30 November 2010. Patients with one or more blood glucose values ≤50 mg/dL on point-of-care glucose testing were considered hypoglycemic. Patients treated with insulin were assumed to have insulin-associated hypoglycemia. Age-, sex-, and race-matched patients with all blood glucose values >70 mg/dL were selected as controls. The Charlson comorbidity index (CCI) was used to control for severity of illness.

RESULTS There were four groups: 1) noninsulin-treated hypoglycemia (NTH) (n = 135), 2) insulin-treated hypoglycemia (ITH) (n = 961), 3) noninsulin-treated control (NTC) (n = 1,058), and 4) insulin-treated control (ITC) (n = 736). Mortality was higher in the ITH group compared with the ITC group (20.3 vs. 4.5%, P < 0.0001), with a relatively higher CCI (1.8 vs. 1.5%, P < 0.0001), but much higher in the NTH group compared with the NTC group (34.5 vs. 1.1%, P < 0.0001), with much higher CCI (2.4 vs. 1.1%, P < 0.0001). Mortality was higher in the NTH group compared with the ITH group (P < 0.0001) but lower in the NTC group compared with the ITC group (P < 0.0001). After controlling for age, sex, CCI, and admission to the intensive care unit, insulin treatment was associated with a lower mortality among the hypoglycemic patients; hazard ratio of death in the ITH group relative to the NTH group was 0.34 (95% CI 0.25–0.47, P < 0.0001).

CONCLUSIONS Insulin-associated and spontaneous hypoglycemia are associated with increased mortality among hospitalized patients.

  • Received July 2, 2012.
  • Accepted October 23, 2012.
  • © 2013 by the American Diabetes Association.

Readers may use this article as long as the work is properly cited, the use is educational and not for profit, and the work is not altered. See http://creativecommons.org/licenses/by-nc-nd/3.0/ for details.

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Hypoglycemia, With or Without Insulin Therapy, Is Associated With Increased Mortality Among Hospitalized Patients
Rajesh Garg, Shelley Hurwitz, Alexander Turchin, Apoorva Trivedi
Diabetes Care May 2013, 36 (5) 1107-1110; DOI: 10.2337/dc12-1296

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Hypoglycemia, With or Without Insulin Therapy, Is Associated With Increased Mortality Among Hospitalized Patients
Rajesh Garg, Shelley Hurwitz, Alexander Turchin, Apoorva Trivedi
Diabetes Care May 2013, 36 (5) 1107-1110; DOI: 10.2337/dc12-1296
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