Conclusions and Summary1. Two groups of patients suffering from myocardial infarction observed by a consultant physician in cardiology, have been the subject of a statistical study. The one group consisted of hospital patients, one other of patients in private practice.2. The object of this study was :a)to conduct research into possible differences in symptomatology of the disease between the two groups;b)to establish, for our area, clinical and electrocardiographic criteria which might serve as the basis for an objective therapeutic study.3. In addition, the influence of two types of therapeutic—with antispasmodics alone or anticoagulants with antispasmodics—has been considered. The critique of this analysis is simple and justifies the importance of the establishment of precise criteria for all future study.4- Besides the classical ideas confirmed by our study, it points out certain facts worthy of interest, common to both groups, such as :a)the similar susceptibility of both intellectual and manual workers to myocardial infarction;b)the low incidence of diabetes in the personal antecedents of the male patients, its higher frequency in women;c)the apparent constancy of the menopause among women suffering from myocardial infarction (98 %);d)the particular frequency of recent anger, also of dyspnea, palpitations, vascular accidents and scapulo-humeral periarthritis in the weeks preceding the accident;e)the almost equal frequency at the onset of the coronary occlusion, of the pain of effort and the pain at rest. The angina appears to be less regular than considered by certain authors;f)besides diverse troubles of rhythm or of conduction, the electrocardiogram brings out evidence of a necrosis in about 87 % of the cases, while lesion and ischemia are observed in 85 % of the patients;g)for the electrocardiographic signs demonstrating the infarction process, the necrosis and ischemia have little tendency to disappear, even after one year; the lesion, itself, persists in a rather great number of cases.5. In hospital cases, there is observed with greater frequency, especially among men : deafness to higher tones, dyspnea, polypnea, stasis pulmonary, hepatomegaly, peripheral oedemas, pericardial friction, bundle branch block, flutter, auriculo-ventricular dissociation, hypotension.These symptoms bring out the great seriousness of most hospitalised cases, a fact confirmed moreover by the respective percentages of mortality.6. Important reservations have been added to the objective value of our therapeutic experiments. It seems, nevertheless, that treatment with anticoagulant, together with antispasmodics, reduces to a significant extent the percentage mortality in the private practice group, equally among men and women.In hospital cases, according to our observations, this beneficial effect has not been demonstrated.7. Our experiences and results indicate us with most clinical research the absolute necessity of perfect standardization among patients made the subject of therapeutic study.