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Amanda I Adler a Diabetes Trial 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, OX3 7LF, c University College London
Medical School, Whittington Hospital, London N19 3UA, d Oxford Centre for
Diabetes, Endocrinology and Metabolism, University of Oxford, e Selly Oak Hospital, Birmingham B29 6JD, f Diabetes Research
Laboratories, Oxford Centre for Diabetes, Endocrinology and Metabolism,
University of Oxford
Correspondence to: A Adler amanda.adler{at}dtu.ox.ac.uk
Objective:
To determine the relation between systolic blood pressure 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:
4801 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 complications or deaths related to diabetes and
all cause mortality. Secondary aggregate outcomes: myocardial
infarction, stroke, lower extremity amputation (including death from
peripheral vascular disease), and microvascular disease (predominantly
retinal photocoagulation). Single end points: non-fatal heart failure and cataract extraction. Risk reduction associated with a 10 mm Hg
decrease in updated mean systolic blood pressure adjusted for specific
confounders
Results:
The incidence of clinical complications was significantly associated with systolic blood pressure, except for
cataract extraction. Each 10 mm Hg decrease in updated mean systolic
blood pressure was associated with reductions in risk of 12% for any
complication related to diabetes (95% confidence interval 10% to
14%, P<0.0001), 15% for deaths related to diabetes (12% to 18%,
P<0.0001), 11% for myocardial infarction (7% to 14%, P<0.0001),
and 13% for microvascular complications (10% to 16%, 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 raised blood
pressure. Any reduction in blood pressure is likely to reduce the risk
of complications, with the lowest risk being in those with systolic
blood pressure less than 120 mm Hg.