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Irene M Stratton a Diabetes Trials
Unit, Oxford Centre for Diabetes, Endocrinology and Metabolism,
University of Oxford, Radcliffe Infirmary, Oxford OX2 6HE, b Division of Public Health
and Primary Care, Institute of Health Sciences, University of Oxford,
Oxford OX3 7LF, c Oxford Centre for Diabetes,
Endocrinology and Metabolism, University of Oxford, Radcliffe Infirmary, d Royal Victoria
Hospital, Belfast BT12 6BA, e Diabetes Research Laboratories, Oxford Centre for
Diabetes, Endocrinology and Metabolism, University of Oxford, Radcliffe
Infirmary
Correspondence to: I M Stratton
irene.stratton{at}dtu.ox.ac.uk
Objective:
To determine the relation between exposure to glycaemia over time and the risk of macrovascular or microvascular complications in patients with type 2 diabetes.
Design:
Prospective observational study.
Setting:
23 hospital based clinics in England,
Scotland, and Northern Ireland.
Participants:
4585 white, Asian Indian, and
Afro-Caribbean UKPDS patients, whether randomised or not to treatment,
were included in analyses of incidence; of these, 3642 were included in
analyses of relative risk.
Outcome measures:
Primary predefined aggregate
clinical outcomes: any end point or deaths related to diabetes and all
cause mortality. Secondary aggregate outcomes: myocardial infarction,
stroke, amputation (including death from peripheral vascular disease),
and microvascular disease (predominantly retinal
photo-coagulation). Single end points: non-fatal heart failure and
cataract extraction. Risk reduction associated with a 1% reduction in
updated mean HbA1c adjusted for possible
confounders at diagnosis of diabetes.
Results:
The incidence of clinical complications was significantly associated with glycaemia. Each 1% reduction in updated
mean HbA1c was associated with reductions in risk
of 21% for any end point related to diabetes (95% confidence interval 17% to 24%, P<0.0001), 21% for deaths related to diabetes (15% to
27%, P<0.0001), 14% for myocardial infarction (8% to 21%,
P<0.0001), and 37% for microvascular complications (33% to 41%,
P<0.0001). No threshold of risk was observed for any end point.
Conclusions:
In patients with type 2 diabetes the risk of diabetic complications was strongly associated with previous hyperglycaemia. Any reduction in HbA1c is likely
to reduce the risk of complications, with the lowest risk being in
those with HbA1c values in the normal range
(<6.0%).
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