“…The aspect of the natural history of coronary artery disease presented in this paper has been discussed in medical papers for many years under a variety of names, including impending coronary occlusion (Sampson and Eliaser, 1937), coronary failure (Freedberg et al, 1948), intermediate coronary syndrome (Graybiel, 1955), acute coronary insufficiency (Master et al, 1956), status anginosus (Papp and Smith, 1960), preinfarction angina (Fowler, 1971), and unstable angina (Conti et al, 1973). The absence of a uniform definition and longterm follow-up and, until lately, angiographic correlation has given no sound basis on which to compare the 2 forms of treatment, medical and surgical.…”