(bă-lĭs″tō-kăr′dē-ō-grăf)
[Pronunciation]
[″ + kardia, heart, + graphein, to write]

A mechanism for measuring and recording the impact caused by the discharge of blood from the heart at each beat and the resulting recoil.
The minute movements of the body with each heartbeat are recorded as they are transmitted to the special platform that supports the subject.