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Calcium and the heart: an essential partnership
J S Ikonomidis1, T A Salerno, C Wittnich
1Division of Cardiovascular Surgery, St Michael's Hospital, Toronto, Ontario.
The Canadian Journal of Cardiology
|September 1, 1990
Summary
Calcium ions are crucial for heart function, influencing electrical activity, mechanical contraction, and drug responses. Understanding calcium handling is vital for treating heart conditions and improving cardiac care.
Area of Science:
- Cardiology
- Cell Physiology
- Pharmacology
Background:
- Calcium ions play a critical role in normal cardiac function.
- Calcium influx impacts cardiac action potentials and the efficacy of calcium channel blockers.
- Intracellular calcium links electrical activity to cardiomyocyte mechanical shortening.
Purpose of the Study:
- To examine the contribution of myocardial calcium influx to cardiac action potential.
- To review the structure and characteristics of cardiac sarcolemmal calcium channels.
- To discuss the role of calcium in various cardiac pathologies and drug mechanisms.
Main Methods:
- Review of current knowledge on cardiac calcium channels.
- Analysis of calcium's role in excitation-contraction coupling.
- Examination of calcium homeostasis in disease states.
Main Results:
- Calcium influx is integral to the cardiac action potential and calcium channel blocker efficacy.
- Intracellular calcium mediates cardiomyocyte contraction and is targeted by drugs like digitalis glycosides.
- Abnormal calcium homeostasis is significant in heart failure, myocardial infarction, and arrhythmias.
Conclusions:
- Understanding myocardial calcium handling is essential for physiologists and physicians.
- Calcium's role in ischemia, the calcium paradox, and developmental differences in neonatal hearts is significant.
- Targeting calcium mechanisms offers therapeutic potential for various cardiovascular diseases.