In the preliminary report,1 the necessity of finding a variable that has a close correlation with the size of the heart was emphasized, and the area of the body surface was suggested, because it includes other variables, such as height, weight, age, sex and diameter of the chest, when persons of ideal weight are used as a standard.
Smith and Bloedorn2 used the area of body surface as a variable to determine the size of the heart, because the former is an index of the mass of actively functioning tissue. They expressed disappointment at the observations, because the individual measurements were scattered over a wide range, which was probably due to the presence of a number of persons in their series whose weights were above ideal; but even then, the range was less than it was when weight was used as a variable.
To determine the size of the heart
KISSANE RW. AREA OF THE BODY SURFACE AND MEASUREMENTS OF THE NORMAL HEART IN CHILDREN: II. ROENTGEN STUDY. Arch Intern Med (Chic). 1930;45(2):241–247. doi:10.1001/archinte.1930.00140080083005
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