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September 1979, Vol 114, No. 9 >
ARTICLE | September 1979

Underlying Flaws in the Sarnoff Curve

ANTONIO BOBA, MD
Arch Surg. 1979;114(9):1092-1093. doi:10.1001/archsurg.1979.01370330114030.
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To the Editor.—Careful analysis of Dr Del Guercio's comments about the article by Samii et al that appeared in the Archives (113:1414-1416, 1978) shows a serious conceptual flaw in the logic underlying the "Sarnoff diagram." To find the flaw, one must look to the "dimensional" aspects of the x and y axes and to the quantities that are plotted on them. One should really think in terms of a "mapping" process, where individual members of one set (values for pulmonary wedge pressure) are placed in some certain correspondence with individual members of another set (the positive integers) in such a manner that certain relationships that exist between objects of the sets are retained after the mapping operation is completed; in this case, a wedge pressure of 9 is higher than a wedge pressure of 8, just as the cardinality of the number 9 is greater than the cardinality of

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