severity scores were separated into mild , moderate and severe groups of approximately equal numbers and correlated with ( 1 ) number of coronary arteries narrowed , ( 2 ) presence of left main cad , ( 3 ) ejection fraction less than 50 % , ( 4 ) abnormalities of left ventricular function , ( 5 ) 3-vessel cad with abnormal left ventricular function , ( 6 ) increased heart size by chest x-ray , ( 7 ) a noninvasive measure of prognosis , and ( 8 ) mortality .
C0205042
coronary arteries
C0018787
heart