Available online http://ccforum.com/content/13/1/117
Page 1 of 2
(page number not for citation purposes)
Abstract
Patients with diabetes mellitus have an increased risk of
developing infections and sepsis. In this issue of Critical Care
Esper and colleagues report on a large survey, involving 12.5
million sepsis cases, that examined the impact of pre-existing
diabetes on organ dysfunction during sepsis. Their main con-
clusion was that diabetes patients, relative to non-diabetics, were
less likely to develop respiratory failure and more likely to develop
renal failure during the course of sepsis.
Most physicians recollect cases where patients with diabetes
had trivial injuries or infection, but rapidly progressed to life
threatening sepsis and death. Although such clinical experi-
ences may suggest that diabetes is associated with more
severe infections and poor outcomes, observational studies
have shown conflicting results. The interaction between
diabetes, a chronic condition, and an acute infection is
complex. Most studies suggest that diabetes increases
susceptibility to infection. However, its effect on outcomes of
infection, especially in the critical care setting, is less clear.
In this issue of Critical Care, Esper and colleagues [1] have
added to our current understanding of organ dysfunction
during severe sepsis by comparing the incidence of different
organ dysfunctions in patients with sepsis who did and did
not have diabetes. There are several key findings of this
study. First, diabetes was associated with higher risk of acute
kidney injury (13% versus 7%) and lower risk of acute
respiratory failure (9% versus 14%); the latter association,
suggesting a protective effect of diabetes, is intriguing and in
line with an earlier study showing that diabetes is associated
with lower risk of acute lung injury in patients with septic
shock [2]. Second, contrary to clinical perception, Esper and
colleagues show that diabetes was associated with lower
case-fatality (18.5% versus 20.6%), likely due to lower risk of
acute respiratory failure, which is often associated with worse
survival [3]. These results would suggest that diabetes may
have no effect or reduce mortality after infection. Indeed,
results of epidemiologic studies to determine the effect of
diabetes on short-term mortality after infection are conflicting
[4-7].
The current study demonstrates complexities of under-
standing interaction between diabetes and outcomes of
infection. Diabetes is a multifaceted disease and abnor-
malities include immune dysfunction and metabolic derange-
ments, including hyperglycemia. Furthermore, these patients
often have a higher burden of chronic conditions, such as
cardiovascular and chronic kidney disease [8], and therapies
used in diabetics, such as insulin, statins and thiazolidine-
diones, together with diabetes associated immune abnor-
malities [9,10], may influence the host response to infection
and outcomes. A clear answer to which factors influence the
overall impact of diabetes on sepsis outcomes will require a
translational approach using epidemiologic studies combined
with animal and in vitro models.
The authors address most limitations in the current study.
First, lower risk of acute respiratory failure could be con-
founded by lower risk of developing respiratory tract infection
in diabetes, but subgroup analysis in individuals with a
respiratory source of infection confirmed findings observed in
the overall analysis. Second, the study used an administrative
dataset and whether acute respiratory failure was due to
acute lung injury could not be determined. Misclassification
errors due to inclusion of patients with acute respiratory
failure due to congestive heart failure or patients who were
intubated due to septic shock without evidence of lung
abnormalities may have occurred. Congestive heart failure is
likely to be more common in diabetes and would attenuate
the difference in the risk of acute lung injury between those
with and without diabetes. Finally, administrative datasets and
Commentary
Diabetes and sepsis outcomes – it is not all bad news
Sachin Yende1,2 and Tom van der Poll3
1The Clinical Research, Investigation, and Systems Modeling of Acute Illness (CRISMA) Laboratory, University of Pittsburgh, Pittsburgh, PA 15261,
USA
2Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, PA 15261, USA
3Center of Infection and Immunity Amsterdam (CINIMA) and Center for Experimental and Molecular Medicine, Academic Medical Center, University of
Amsterdam, 1105 AZ Amsterdam, The Netherlands
Corresponding author: Sachin Yende, yendes@upmc.edu
Published: 18 February 2009 Critical Care 2009, 13:117 (doi:10.1186/cc7707)
This article is online at http://ccforum.com/content/13/1/117
© 2009 BioMed Central Ltd
See related research by Esper et al., http://ccforum.com/content/13/1/R18
Critical Care Vol 13 No 1 Yende and van der Poll
Page 2 of 2
(page number not for citation purposes)
even well designed observational studies cannot tease out
acute and chronic organ dysfunction. For instance, the
diagnosis of acute kidney injury is difficult when pre-illness
creatinine levels are not routinely available. Thus, the higher
risk of acute kidney injury in diabetes could be confounded by
higher prevalence of chronic kidney disease. Finally,
discrimination between insulin-dependent and non-insulin-
dependent diabetes could not be made, and no information
was available on glucose levels at and after admission or on
the regulation of diabetes prior to the septic episode (for
example, by using HbA1c levels).
In summary, these findings by Esper and colleagues advance
our current understanding of the interaction between diabetes
and infection. Well designed epidemiologic studies and
translational approaches are necessary to understand the
factors that contribute to sepsis outcomes in diabetics and
the mechanisms involved. Unlike most non-infectious illnesses,
such as cardiovascular disease and cancer, where diabetes
is associated with poor outcomes [11,12], diabetes may
confer some protection against acute lung injury in patients
with sepsis and may not be associated with higher short-term
mortality after infection - indeed it is not all bad news.
Competing interests
The authors declare that they have no competing interests.
Acknowledgements
Sachin Yende is supported by a K23 grant (K23GM083215) from the
National Institute of General Medical Sciences, National Institute of
Health.
References
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on organ dysfunction with sepsis: an epidemiologic study. Crit
Care 2009, 13:R18.
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R, Hudson LD, Parsons PE: Diabetic patients have a decreased
incidence of acute respiratory distress syndrome. Crit Care
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M, Stern EJ, Hudson LD: Incidence and outcomes of acute lung
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