the benefit of surgical treatment tended to be greater , but not significantly so , as assessed by interaction analysis in the subgroups of patients who were older or who had signs of ischemia or previous infarction on the resting electrocardiogram , a markedly ischemic response to exercise testing , peripheral arterial disease , an absence of hypertension , and proximal obstruction in the left anterior descending artery .
C0022116
ischemia
C0021308
infarction