[An application of a study of medical history to clinical medicine - for better understanding of medical history and its application to clinical medicine].
A study of medical history aims to correctly understand the progress in basic and clinical medical science and to effectively offer better medical service to our patients. The study of medical history has several important advantages, such as; 1) to understand the present medical science in depth and to shorten the duration of time needed to understand the present medicine, 2) to understand the disadvantages of the present medical sciences realizing that they are not perfect, 3) to correctly understand literature and historical documents on medical science, 4) to make and maintain accurate medical records and documents, 5) to create new concepts and 6) to prevent us from developing a rigid way of thinking. Two cases of the application of medical history to clinical medicine are shown. The first is in regard to perioperative blood transfusion. As it was suggested to me by a report that preoperative blood transfusion caused suppression of immune response in kidney transplantation, I thought a routine use of blood transfusion for surgical patients with malignant tumors would lead to a high postoperative recurrence rate of malignancy. Therefore, such a routine use of blood has been avoided inn our institution for these twenty years. The second case is in regard to excitement during the induction of inhaled anesthetics. At present the excitement is considered to be caused by inhibition of the cerebral cortical function. However, our recent clinical study based on Dr. Maeda's report published in 1935 has revealed that the excitement observed during the induction of inhaled anesthesia is caused mainly by stimulation of the trigeminal nerves. The importance of medical history should be much more stressed for medical training of students and residents as well as physicians. It should be widely and deeply applied to the clinical practice of medicine, though it is not so easy to do this. Otherwise, the study of medical history may be considered as only a hobby for retired physicians.