"Phonocardiography" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus,
MeSH (Medical Subject Headings). Descriptors are arranged in a hierarchical structure,
which enables searching at various levels of specificity.
Graphic registration of the heart sounds picked up as vibrations and transformed by a piezoelectric crystal microphone into a varying electrical output according to the stresses imposed by the sound waves. The electrical output is amplified by a stethograph amplifier and recorded by a device incorporated into the electrocardiograph or by a multichannel recording machine.
Below are MeSH descriptors whose meaning is more general than "Phonocardiography".
Below are MeSH descriptors whose meaning is more specific than "Phonocardiography".
This graph shows the total number of publications written about "Phonocardiography" by people in this website by year, and whether "Phonocardiography" was a major or minor topic of these publications.
To see the data from this visualization as text, click here.