myocardiograph

plural myocardiographs

1. medicineAn instrument that records the movement of heart muscle.

   From above down: amplitude of cardiac contractions (recorded my means of a myocardiograph with pneumatic transmission), blood pressure, […]

   1965, Natalia V. Kaverina, Pharmacology of the Coronary Circulation, page 110

   2 more examples

   Small myocardiographs recording by means of Frank capsules were used in the experiments here described, and the arrangement of the apparatus was essentially the same as described by Wiggers (2) and used for analyzing the contraction process in mammalian auricle.

   1920, D.J. Edwards, “Segmental activity in the heart of the Limulus”, in American Journal of Physiology, volume 52, number 2, page 276

   Heart contractions are usually recorded with a Cushny myocardiograph sewn to the wall of the left ventricle and attached to a simple quasi-isometric lever system.

   2013, D.R. Laurence, A.L. Bacharach, Evaluation of Drug Activities: Pharmacometrics, page 388