Some data also suggest that ischemic burden might be useful in targeting ischemia-guided revascularization. In a substudy of the COURAGE trial, the overall event-free survival rate was 86.6% in patients with $5% reduction in ischemic myocardium versus 75.3% in those without significant reduction in ischemic burden after 6 Although this trial substudy was not powered to examine differences in clinical outcomes, the results are similar to the BARI 2D trial, in which patients with high myocardial jeopardy scores randomized to CABG had fewer cardiovas- cular events (AMI and composite endpoint of all-cause mortality or MI and cardiac death or MI) than those with high scores who received only medical therapy.276,409 6.3.5. Stability of Results After Normal Stress Testing in Patients With Known SIHD The durability of information gained from a stress test over time varies widely according to the characteristics of the patients and the type of test performed. Among patients with several clinical risk factors and negative stress imaging studies, the relative hazard for cardiac death or MI can increase after a 2-year follow-up time period, whereas among other groups, the risk remains low through 2 years and can be safely assumed to remain low for an extended period of time. In 1 large single-site study, the factors associated with an earlier increase in risk included diabetes mellitus, male sex, increased age (ie, $70 years), a history of previous MI or revascularization, and having undergone a pharmacological stress test rather than an exercise test327 (Figure 15). The relationships were, however, complex and covarying. 