A quantitative method has been already established for differential diagnosis between cerebral hemorrhage and infarction. The method is based on evaluating frequency of occurrence for each of the 15 items (age, history of strokes, stroke status, how strokes occur, respiration, blood pressure, clouding of consciousness, headache, vomiting, conjugate deviation, light reflex, stiffness of the neck, dyskinesia, Babinski reflex, and cerebrospinal fluid), regardless of whether consciousness was seriously affected or not. In the present study, first, the presence of hemorrhage or infarction was ascertained by means of Computed Tomography. Then the patients were classified into two groups: consciousness seriously affected and that slightly affected. In the case of consciousness seriously affected, frequency of occurrence was assessed for each of the 11 items (age, history of strokes, stroke status, respiration, blood pressure, clouding of consciousness, vomiting, light reflex, stiffness of the neck, dyskinesia, and cerebrospinal fluid) whereas in the case of consciousness slightly affected for each of the 7 items (age, history of strokes, how strokes occur, blood pressure, headache, stiffness of the neck, and cerebrospinal fluid).
By the revised quantitative method, the differential diagnosis between cerebral hemorrhage and infarction was improved by about 10%.