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Objective To examine the effect of systolic and diastolic blood pressure achieved in the first year of treatment on all cause mortality in patients newly diagnosed with type 2 diabetes, with and without established cardiovascular disease.

Design Retrospective cohort study.

Setting United Kingdom General Practice Research Database, between 1990 and 2005.

Participants 126 092 adult patients (age ≥18 years) with a new diagnosis of type 2 diabetes who had been registered with participating practices for at least 12 months.

Main outcome measure All cause mortality.

Results Before diagnosis, 12 379 (9.8%) patients had established cardiovascular disease (myocardial infarction or stroke). During a median follow-up of 3.5 years, we recorded 25 495 (20.2%) deaths. In people with cardiovascular disease, tight control of systolic (<130 mm Hg) and diastolic (<80 mm Hg) blood pressure was not associated with …