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Updated: Aug 11, 2026
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Primary Culture of Adult Rat Heart Myocytes
Published on: June 16, 2009
Isolated working rat heart adaptation after abrupt changes in extracellular Ca2+ concentration
1Institute of Physiology, FUB, Berlin, Germany. schmidt@mail.grumed.fu-berlin.de
Research in Experimental Medicine. Zeitschrift Fur Die Gesamte Experimentelle Medizin Einschliesslich Experimenteller Chirurgie
|March 29, 2001
Summary
The heart
Area of Science:
- Cardiovascular Physiology
- Cardiac Excitation-Contraction Coupling
Background:
- Acute changes in extracellular calcium (Ca2+) significantly impact myocardial contractility.
- The heart exhibits complex regulatory mechanisms in response to altered calcium levels.
Purpose of the Study:
- To investigate the adaptive responses of cardiac contractility to rapid changes in perfusate calcium concentration.
- To elucidate the underlying mechanisms responsible for the observed adaptive cardiac behavior.
Main Methods:
- Isolated working rat heart model.
- Manipulation of perfusate Ca2+ concentration (1.25-10 mM).
- Measurement of left ventricular contractility via maximum left ventricular pressure change velocity (LVdP/dt max) and left ventricular end-diastolic pressure (LVEDP).
Main Results:
- Rapid Ca2+ changes induced immediate alterations in LVdP/dt max and LVEDP.
- Within 10 minutes, cardiac contractility adapted in the opposite direction of the initial change.
- Adaptive responses were independent of heart rate, coronary flow, and unaffected by thapsigargin or benzamil.
Conclusions:
- The myocardium possesses an intrinsic regulatory mechanism that attenuates acute inotropic effects of Ca2+ fluctuations.
- This adaptive phenomenon may serve as a protective measure against calcium overload, particularly during elevated catecholamine levels.
