The ADDITION study is a study of people
with screen detected DM2 in a multicenter European design. Aim to evaluate a intensive multifactorial
CVD intervention in primary care early into the course of DM2. A stepwise screening programme was targeted
at people with high diabetes risk in general practice. Target population was nearly 400,00 people
aged 40-69 years. About 70,000 high risk
people screened and identified just over 3000 people with DM2. Patients were randomized to routine care or
intensive treatment. In the intensive
group there was a target driven protocol if HbA1c > 6.5% increase glycaemic
treatment. Target BP <135/85 and
target Total Cholesterol 3.5 mmol/l.
Around 1,350 patient in each arm, mean age about 57 years and > 90%
Caucasian. Almost 100% 5 year follow up
was achieved.
At baseline about 45% were on BP lowering
drugs. At 5 years almost twice as many were on BP lowering drugs, but more so
in intensive group. About 12% on stating
at baseline but far more at 5 years with around 70% with a similar pattern to
BP drugs. This resulted in significantly
greater reductions in BP and Cholesterol in the intensive group at 5 years.
Primary endpoints were CVD events. There was a NS 17% risk reduction in favour
of intensive treatment at 5 years.
Intensive glucose management was NOT associated with increased risk of
mortality. Mortality in both groups was
low and only slightly higher than the general population. Comparison with the Michigan CVD mortality
model suggests that compared to a model without treatment there was a
significant reduction in mortality in both routine and intensive groups.
In conclusion it is possible to screen for
DM2 in primary care and this improves early detection and CVD risk
intervention. In the present study both
routine and intensive groups sustained significantly reduced mortality when
compared with a mortality model without treatment intervention. There was a non-significant 17% reduction in
CVD mortality if intensive risk factor intervention is initiated early in DM2.
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