Background: Hyperglycaemia is associated with poor outcomes from pneumonia, myocardial infarction and stroke, but the effect of blood glucose on outcomes from acute exacerbations of chronic obstructive pulmonary disease (AECOPD) has not been established. Recent UK guidelines do not comment on measurement or control of blood glucose in AECOPD. A study was therefore undertaken to determine the relationship between blood glucose concentrations, length of stay in hospital, and mortality in patients admitted with AECOPD.
Methods: Data were retrieved from electronic records for patients admitted with AECOPD with lower respiratory tract infection in 2001–2. The patients were grouped according to blood glucose quartile (group 1, <6 mmol/l (n = 69); group 2, 6.0–6.9 mmol/l (n = 69); group 3, 7.0–8.9 mmol/l (n = 75); and group 4, >9.0 mmol/l (n = 71)).
Results: The relative risk (RR) of death or long inpatient stay was significantly increased in group 3 (RR 1.46, 95% CI 1.05 to 2.02, p = 0.02) and group 4 (RR 1.97, 95% CI 1.33 to 2.92, p<0.0001) compared with group 1. For each 1 mmol/l increase in blood glucose the absolute risk of adverse outcomes increased by 15% (95% CI 4 to 27), p = 0.006. The risk of adverse outcomes increased with increasing hyperglycaemia independent of age, sex, a previous diagnosis of diabetes, and COPD severity. Isolation of multiple pathogens and Staphylococcus aureus from sputum also increased with increasing blood glucose.
Conclusion: Increasing blood glucose concentrations are associated with adverse clinical outcomes in patients with AECOPD. Tight control of blood glucose reduces mortality in patients in intensive care or following myocardial infarction. A prospective study is now required to determine whether control of blood glucose can also improve outcomes from AECOPD.
- AECOPD, acute exacerbation of chronic obstructive pulmonary disease
- FEV1, forced expiratory volume in 1 second
- FVC, forced vital capacity
- ICU, intensive care unit
- chronic obstructive pulmonary disease
- length of stay
- nosocomial infection
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Published Online First 31 January 2006
No external funding was received for the execution of this study.
Competing interests: none.
All the authors contributed to the conception and design, or acquisition of data, or analysis and interpretation of data; drafting the article or revising it critically for important intellectual content; and final approval of the version to be published.
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