. The American journal of roentgenology, radium therapy and nuclear medicine . r .7854 which appears in bothnumerator and denominator of the practice, therefore, we multiply thelong diameter by the short diameter andcall this product the POD (Product ofDiameters). The product so obtained isdivided by the corresponding value froma table of normal PODs of the basis ofbody weight. Hearts falling between 100per cent and 110 per cent are considerednormal according to the table which weempIoy(Fig. 1). This table of normals whenplotted into a curve falls very nearly on aline representing the
. The American journal of roentgenology, radium therapy and nuclear medicine . r .7854 which appears in bothnumerator and denominator of the practice, therefore, we multiply thelong diameter by the short diameter andcall this product the POD (Product ofDiameters). The product so obtained isdivided by the corresponding value froma table of normal PODs of the basis ofbody weight. Hearts falling between 100per cent and 110 per cent are considerednormal according to the table which weempIoy(Fig. 1). This table of normals whenplotted into a curve falls very nearly on aline representing the following relationship. The area in square centimeters is equal toa constant times the cube root of theweight in pounds squared. Except as to theconstant, this table is in close harmonywith the values for cardiac area deduced byBardeen and is a simple expression of thehypothesis that the weight of the heartvaries directly with the weight of thebody and that comparable areas on similarvolumes vary as the cube root of the I1QRMAL RATIO BOD/ WC1GHT •. —.I. Fig. 1. Table showing relation of P O D to norma! bodyweight. Experience has shown that this table isapproximately 5 per cent too low. Consequentlyhearts ranging from ioo to no per cent of the valuesin this table are considered normal. After Van Zwalu-wenburg. squares of these volumes. Anatomically ithas been repeatedly proven that the heart,of all the organs, is the most closely relatedin size to the size of the body as a whole. While the size of the heart depends on alarge number of factors including weight,habitus, position, excursion of pulsation,age, sex, and pulse frequency, it has beenborne out by clinical experience, and thereis abundance of proof both anatomical androentgenological, that the weight is farthe most important factor. As a matter offact, height, sex, and age have a verysubsidiary value except at the extremeswhere the estimation of their effect israrely difficult. A factor which is of g
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