A cardiac contractility computer.
- 1 March 1968
- journal article
- research article
- Published by American Physiological Society in Journal of Applied Physiology
- Vol. 24 (3) , 419-423
- https://doi.org/10.1152/jappl.1968.24.3.419
Abstract
One quantitative index of cardiac contractility is the ratio of the maximum rate of iso-volumic intraventricular pressure development, dp/dt, to the integal of that pressure development, IIT [integrated isometric tension]. An electronic device to obtain this ratio is described. The input is the analog of intraventricular pressure. Circuits to differentiate and integrate, in peak-reading memories, delays, switches, and holds, present dp/dt and IIT to a divider. Several additional indices of myocardial behavior are available outputs; mean heart rate, interval between beats, duration of systole, peak systolic pressure, and diastolic pressure.This publication has 2 references indexed in Scilit:
- Sympathetic and Parasympathetic Interactions upon the Left Ventricle of the DogCirculation Research, 1966
- Isometric Time-Tension Relationships as an Index of Myocardial ContractilityCirculation Research, 1963