The determination of the functional capacity of the vital organs is a problem that is of the utmost interest in prognosis. If a man consults a physician for symptoms pointing to disturbance of the heart, the kidneys or the liver it would be of great advantage not only to the patient, but also to his advisor if some satisfactory means were known by which the power of the affected organ to do its work could be determined. So far as concerns the kidneys and the liver, fairly reliable functional tests are at our disposal. Are we able to say as much of the myocardium? For example, a man, aged 50 or more years, presents himself in the consulting room complaining of dyspnea, or perhaps of some symptom less definitely associated with myocardial insufficiency. He proves to be a modern business man with important obligations. He has lived the life
SWAN JM. HOW SHALL WE TELL WHETHER OR NOT THE MYOCARDIUM IS COMPETENT? Arch Intern Med (Chic). 1915;XV(2):269–285. doi:10.1001/archinte.1915.00070200091007
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