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The phonocardiographic demonstration of heart sounds and murmurs has proved itself a most valuable tool for the teaching, learning and understanding of cardiac auscultation. In an introductory chapter the basic principles for the graphic recording of auscultatory phenomena are very well defined. Especially well done is the section on filter and filter design with graphs demonstrating the system developed and applied by the authors. The work of the Swedish, British and German investigators was unquestionably facilitated by the availability of superb instruments with multichannel recording of up to eight channels simultaneously, with photographic or "direct" recording systems. The Swedish Elmquist
Atlas und Kurzgefasstes Lehrbuch der Phonokardiographie und verwandter Untersuchungsmethoden.. Ann Intern Med. 1956;45:731. doi: https://doi.org/10.7326/0003-4819-45-4-731_1
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Published: Ann Intern Med. 1956;45(4):731.
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