Cluster 288: pectoris angina infarction myocardial months unstable starting prior acute drug 
Cluster 356: heart uncontrolled failure congestive hypertension disease angina significant unstable symptomatic 
Cluster 551: uncontrolled myocardial infarction angina congestive heart failure months cardiac unstable 
Cluster 1007: angioplasty stenting cardiac heart infarction myocardial angina unstable vascular cardiovascular 
Cluster 1051: angina myocardial infarction unstable months history prior day study enrollment 
Cluster 1181: angina unstable months prior entry intervention disease medical surgical study 
Cluster 1242: heart arterial thrombotic evidenced disease infarction myocardial measurement york unstable 
Cluster 1867: infarction myocardial cardiac months history prior entry stress study unstable 
Cluster 2041: angina new heart onset months cardiac rest anginal nyha infarction 
Cluster 2289: heart congestive myocardial failure infarction months unstable angina history cardiac