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Reappraisal of the Multicellular Preparation for the In Vitro Physiopharmacological Evaluation of Myocardial Performance

  • Stanislas U. Sys
  • Gilles W. De Keulenaer
  • Dirk L. Brutsaert
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 453)

Abstract

In order to evaluate myocardial performance, single cardiomyocytes suffer from technical problems and from the fact that some basic functional properties vanish when one moves down the hierarchic scale from multicellularity to single cells. The isolated papillary muscle has at present proven to be superior to the isolated intact cardiomyocyte. A large number of major intra-and extracellular features required to describe myocardial performance can be derived from analyzing twitch contraction and relaxation in the multicellular isolated papillary muscle. In addition, the present paper illustrates the possibility to differentiate between effects of inotropic interventions on activating Ca2+ and Ca2+ sensitivity in multicellular preparations, from a grid analysis of isometric twitches in a coordinate system of peak rate of force development (+dF/dt; reflecting the time pattern of twitch contraction) versus time to half relaxation (tHR; reflecting the time pattern of twitch relaxation). The abundance of information about myocardial performance that can be derived from the easily accessible multicellular preparation reflects its physiological kinship with the intact ventricle.

Keywords

Papillary Muscle Muscle Length Myocardial Performance Slack Length Hierarchic Scale 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1998

Authors and Affiliations

  • Stanislas U. Sys
    • 1
  • Gilles W. De Keulenaer
    • 1
  • Dirk L. Brutsaert
    • 1
  1. 1.Department of Physiology and MedicineUniversity of AntwerpAntwerpBelgium

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