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Pathophysiology of cardiac dysfunction in congestive heart failure
N S Dhalla1, N Afzal, R E Beamish
1Division of Cardiovascular Sciences, St Boniface General Hospital Research Centre, Faculty of Medicine, University of Manitoba, Winnipeg.
The Canadian Journal of Cardiology
|December 1, 1993
Summary
Congestive heart failure (CHF) involves contractile dysfunction linked to calcium handling issues in heart cells. Remodeling of subcellular organelles, potentially due to gene expression changes, underlies these calcium abnormalities and CHF progression.
Area of Science:
- Cardiology
- Molecular Biology
- Pathophysiology
Background:
- Congestive heart failure (CHF) arises from factors like myocardial infarction and pressure/volume overload.
- The exact mechanisms of contractile dysfunction in CHF remain unclear.
- While initially adaptive, hormonal pathways like renin-angiotensin and sympathetic systems become detrimental in chronic CHF.
Purpose of the Study:
- To explore the pathogenesis of contractile dysfunction in congestive heart failure.
- To investigate the role of calcium handling abnormalities in cardiac cells during CHF.
- To understand how subcellular organelle remodeling contributes to CHF.
Main Methods:
- Review of existing literature on CHF pathogenesis.
- Analysis of the role of humoral and hormonal pathways.
- Examination of calcium handling and subcellular organelle function in cardiac cells.
Main Results:
- Cardiac dysfunction in CHF is strongly associated with abnormal calcium handling in cardiac cells.
- Abnormalities in Ca2+ handling and interaction are linked to the remodeling of subcellular organelles (sarcolemma, sarcoplasmic reticulum, mitochondria).
- Subcellular organelle remodeling may result from altered gene expression or protein-phospholipid interactions.
Conclusions:
- Calcium handling abnormalities are central to cardiac dysfunction in CHF.
- Remodeling of subcellular organelles plays a critical role in the pathophysiology of CHF.
- Developing interventions to prevent subcellular organelle remodeling could improve CHF therapy.