Abstract
Measurements of cardiac and thoracic diameters were made on 250 routine chest radiographs taken during pregnancy, and on 50 routine chest radiographs of non-pregnant females. The cardiac and thoracic diameters were found to increase during pregnancy, but in the majority of cases the cardiac diameter is not greater than 1/2 the thoracic diameter. In those cases where the cardiac diameter is greater than 1/2 the thoracic diameter, the accurately determined cardio-thoracic ratio should be assessed using the graph before a diagnosis of cardiac enlargement is made. If any doubt remains as to whether or not the cardiac diameter is enlarged, reference may be made to Jacobs'' tables.

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