Association of systolic blood pressure with macrovascular and microvascular complications of type 2 diabetes (UKPDS 36): prospective observational study.
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.


METHODS
Prospective observational study.


METHODS
23 hospital based clinics in England, Scotland, and Northern Ireland.


METHODS
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.


METHODS
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.
Diabetes Trial Unit, Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Radcliffe Infirmary, Oxford OX2 6HE, UK.
A I
AI
Adler
I M
IM
Stratton
H A
HA
Neil
J S
JS
Yudkin
D R
DR
Matthews
C A
CA
Cull
A D
AD
Wright
R C
RC
Turner
R R
RR
Holman
D000328:Adult; D000368:Aged; D002387:Cataract Extraction; D003924:Diabetes Mellitus, Type 2 / Q000150:complications* / Q000401:mortality; D003925:Diabetic Angiopathies / Q000453:epidemiology*; D005260:Female; D006333:Heart Failure / Q000209:etiology / Q000401:mortality; D006801:Humans; D006973:Hypertension / Q000150:complications* / Q000401:mortality; D015994:Incidence; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000209:etiology / Q000401:mortality; D016016:Proportional Hazards Models; D011446:Prospective Studies; D012044:Regression Analysis; D012306:Risk; D020521:Stroke / Q000209:etiology / Q000401:mortality; D013599:Systole