The DIAD Study: A Randomized Regimented Trial

Context: Hardening of the arteries (CAD) is the leading cause of mortality and morbidity in patients with type 2 diabetes. But the usefulness of testing patients with type 2 diabetes for asymptomatic CAD is contentious.

Objective To evaluate whether regular screening for CAD identifies patients with type 2 diabetes as being at utmost cardiac peril and whether it impacts their cardiac issues.

Conception, Setting, and Patients: The detecting of ischaemia in Asymptomatic Diabetics (DIAD) report is a randomized controlled trial in which 1123 participants with type 2 diabetes and no symptoms of CAD were arbitrarily designated to be screened with adenosine-stress radionuclide myocardial perfusion imaging (MPI) or not to be screened. Participants were enrolled from diabetes clinics and practices and prospectively followed up from August 2000 to September 2007.

Primary Result: Appraise Cardiac demise or nonlethal myocardial infarction (myocardial infarct).

Outcomes: The cumulative cardiac event grade was 2.9% over a normal (SD) reexamination of 4.8 (0.9) years for an average of 0.6% each year. Seven nonfatal MIs and 8 cardiac deaths (2.7%) came about among the screened group and 10 nonfatal MIs and 7 cardiac deaths (3.0%) among the not-screened group (risk ratio [HR], 0.88; 95% confidence interval [CI], 0.44-1.88; P = .73). Of those in the screened group, 409 participants with standard outcomes and 50 with reduced MPI faults had more deficient event rates than the 33 with modest or sizable MPI defects; 0.4% per year vs 2.4% per year (HR, 6.3; 95% CI, 1.9-20.1; P = .001). All the same, the affirmative prognostic value of sustaining moderate or large MPI defects was merely 12%. The gross rate of coronary revascularization was depressed in both groups: 31 (5.5%) in the screened group and 44 (7.8%) in the unscreened group (HR, 0.71; 95% CI, 0.45-1.1; P = .14). During the course of study there was a considerable and tantamount growth in basic medical prevention in both groups.

Determination: In this contemporaneous study universe of patients with diabetes, the cardiac event rates were modest and weren’t significantly contracted by MPI screening for myocardial ischemia across 4.8 years.