Cluster 172: heart york association new class myocardial infarction unstable failure congestive 
Cluster 1738: class heart association activity york disability ordinary new comfortable physical 
Cluster 1822: heart unstable cardiovascular angina york association new significant infarction myocardial 
Cluster 1823: heart york association infarction iii myocardial new iv class angina 
Cluster 2299: ventricular heart significant fibrillation failure myocardial infarction tachycardia association york