Abstract
1) In a group of 154,111 photofiuorograms there were 515 cases in which cardiac abnormality was suspected. 2) Questionnaires were sent to the personal physicians of the 515 cardiac suspects requesting the final diagnosis and other pertinent information. 3) There were 257 complete replies, 244 of which indicated the presence of cardiac abnormality. 4) Of the 244 cases of cardiac abnormality 21 (9 per cent) were previously unknown to the patients' physicians. Further analysis revealed that only eight of these were actually in need of medical therapy or counselling, giving a discovery rate of about 5 per 100,000 persons x-rayed for such cases, which are really the pertinent ones. 5) In evaluating the heart disease case-finding potential of 70 mm. chest x-ray surveys attention should be paid to how many previously unknown cases are found who are in need of medical attention, and not merely how many new cases of cardiac abnormality are found.
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