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[A study on the changes of myocardial intracellular calcium in patients with heart failure]
1Xin Qiao Hospital, Third Military Medical University, PLA, Chongqing.
Insights
Calcium deposits shift within heart cells in patients with rheumatic heart disease, increasing in the cytoplasm and mitochondria. This intracellular calcium overload correlates with myocardial injury, suggesting potential therapeutic targets.
Area of Science:
- Cardiology
- Cell Biology
- Biochemistry
Background:
- Chronic rheumatic valvular disease can lead to heart failure.
- Intracellular calcium regulation is crucial for myocardial function.
- Understanding calcium distribution is key to addressing heart failure pathology.
Purpose of the Study:
- To investigate the distribution of intracellular calcium deposits in myocardial cells of patients with heart failure due to chronic rheumatic valvular disease.
- To correlate calcium deposit patterns with myocardial ultrastructural injury.
- To explore potential therapeutic implications for myocardial protection.
Main Methods:
- Utilized the pyroantimonate method for localizing calcium deposits in myocardial tissue.
- Examined myocardial ultrastructure to assess cellular injury.
- Correlated calcium distribution with observed ultrastructural damage.
Main Results:
- Calcium deposits significantly decreased or disappeared from the plasmic membrane.
- Marked increases in intracellular calcium were observed in the cytoplasm, intramitochondria, and myofilament bands (I- and A- bands).
- The extent of intracellular calcium deposition correlated directly with the degree of myocardial ultrastructural injury.
Conclusions:
- Intracellular calcium overload is strongly implicated as a major cause of myocardial injury in this patient group.
- Therapeutic strategies targeting calcium regulation, such as angiotensin-converting enzyme inhibitors, beta-adrenergic blockers, and calcium channel blockers, may be beneficial.
- These medications hold potential for protecting the myocardium and improving cardiac function in patients with heart failure secondary to rheumatic valvular disease.
Abstract:
Myocardial intracellular calcium was studied in patients with chronic rheumatic valvular disease. Calcium deposit localized by pyroantimonate method was significantly decreased or disappeared on plasmic membrane and was markedly increased in cytoplasma, intramitochondria and I- and A- bands of myofilament in patients with heart failure due to chronic rheumatic heart valvular disease. The degree of intracellular calcium deposit was consistent with the injury of myocardial ultrastructure, suggesting that calcium overload may be one of the major causes of myocardial injury and the angiotensin-converting enzyme inhibitors, beta-adrenergic blockers and calcium channel blockers may be useful for protecting myocardium and improving cardiac function.