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.
Phonocardiographies
D006439
Hemodynamics
The movement and the forces involved in the movement of the blood through the CARDIOVASCULAR SYSTEM.
Hemodynamic
D006801
Humans
Members of the species Homo sapiens.
Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000208
Acute Disease
Disease having a short and relatively severe course.
Acute Diseases,Disease, Acute,Diseases, Acute
D000328
Adult
A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available.