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Related Experiment Video

Updated: Jul 4, 2026

Assessment of Myofilament Ca2+ Sensitivity Underlying Cardiac Excitation-contraction Coupling

Assessment of Myofilament Ca²⁺ Sensitivity Underlying Cardiac Excitation-contraction Coupling

Published on: August 1, 2016

Reduced calcium responsiveness characterizes contractile dysfunction following coronary microembolization.

Andreas Skyschally¹, Petra Gres, Patrick van Caster

¹Institute of Pathophysiology, University School of Medicine, Essen, Germany.

Basic Research in Cardiology

|June 26, 2008

Summary

This summary is machine-generated.

Microembolization impairs myocardial function by reducing maximal contractile force, not altering calcium sensitivity. This study investigated calcium responsiveness in microembolized myocardium six hours post-procedure.

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Last Updated: Jul 4, 2026

Assessment of Myofilament Ca2+ Sensitivity Underlying Cardiac Excitation-contraction Coupling

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Published on: August 1, 2016

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats

Published on: June 28, 2019

Area of Science:

Cardiology
Cardiovascular Physiology
Myocardial Infarction Research

Background:

Coronary microembolization (ME) is a model for myocardial stunning and dysfunction.
Understanding the mechanisms of ME-induced cardiac dysfunction is crucial for developing therapeutic strategies.

Purpose of the Study:

To investigate the impact of coronary microembolization on myocardial calcium responsiveness.
To determine if altered calcium sensitivity contributes to myocardial dysfunction following ME.

Main Methods:

Anesthetized pigs underwent coronary microembolization (ME) or a placebo procedure.
Myocardial work index (WI) was measured at baseline and 6 hours post-procedure.
Calcium responsiveness was assessed by observing WI changes during graded intracoronary CaCl(2) infusion.

Main Results:

ME significantly reduced the myocardial work index at 6 hours compared to baseline.
The reduced WI in ME pigs was observed across all tested calcium concentrations.
No significant change in the calcium concentration required for half-maximal WI increase was found, indicating unchanged calcium sensitivity.

Conclusions:

Myocardial dysfunction following ME is characterized by a reduction in maximal contractile force.
Altered calcium sensitivity is not the primary mechanism behind ME-induced myocardial dysfunction.