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This small monograph of work emanating from the Cardiac Department of the London Hospital and carried out under the supervision of Dr. John Parkinson is an important contribution on the utility of x-ray examination in heart disease. The monograph contains an analysis of the development and prognosis of cardiac enlargement in approximately 200 cases of the more common types of heart disease. It is based on the direct superposition of successive cardiac outlines traced from teleroentgenograms taken with carefully standardized technic. Among other things, it was concluded that (a) a residue of cardiac enlargement persists following prolonged bouts of congestive failure, (b) the position of the diaphragm is important in determining the apparent size of the heart, (c) enlargement was usually an involvement of all heart chambers, although certain valvular lesions tended to favor the enlargement of particular chambers, (d) the distribution of the enlargement to all chambers of the
The Development of Cardiac Enlargement in Disease of the Heart: A Radiological Study. JAMA. 1937;109(21):1750. doi:10.1001/jama.1937.02780470072030
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