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Diagrammatic representation of heart sounds and murmurs is not a new idea, but this is the first real attempt to standardize records so that any physician, regardless of language barriers, will understand immediately what is recorded. Blue is used for heart sounds and red for murmurs. Although the author has made the symbols as simple as possible, still a code is necessary to decipher some of the charts. The picture does not speak for itself. Once having mastered the code, a complete description of heart sounds and murmurs can be recorded rapidly in a small space. Some of the examples chosen by the author are unfortunate. For instance, figure 11 records auscultatory findings in a patient each year for a 10-year period. It is hard to believe that this patient in 1947 had no murmurs, in 1950 had such marked mitral stenosis as to require cardiac surgery, in 1951 had
Cardio-Charting: Universal Method of Recording Heart Auscultation. JAMA. 1958;167(2):271. doi:10.1001/jama.1958.02990190125034