MeSH definition : 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.;
MeSH synonym : phonocardiographies;
MeSH annotation : NIM; consider also HEART AUSCULTATION; /drug eff /rad eff permitted; do not use /util
except by MeSH definition; DF: PHONOCARDIOGR; usually NIM;
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.
Allowable qualifiers