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Isolation of Human Atrial Myocytes for Simultaneous Measurements of Ca2+ Transients and Membrane Currents
Published on: July 3, 2013
The effects of calcium entry blockade on normal and ischemic ventricular diastolic function
1Department of Medicine/Cardiology, University of Texas Health Science Center, San Antonio 78284.
Calcium entry blockers like diltiazem, nifedipine, and verapamil improve diastolic filling in heart disease patients. These benefits stem from indirect effects on the heart, not direct calcium channel actions.
Area of Science:
- Cardiology
- Pharmacology
- Physiology
Background:
- Calcium entry blockers are widely used clinically.
- Diastolic dysfunction is a key feature in several cardiovascular diseases.
- Previous studies suggested potential benefits of these drugs on diastolic function.
Purpose of the Study:
- To review the evidence on calcium entry blockers' effects on diastolic filling.
- To elucidate the mechanisms behind these observed improvements in diastolic function.
Main Methods:
- Review of existing clinical and pharmacological data.
- Analysis of noninvasive measurements of diastolic filling.
- Evaluation of indirect cardiovascular effects of calcium entry blockers.
Main Results:
- Calcium entry blockers (diltiazem, nifedipine, verapamil) improve diastolic filling indexes.
- These improvements are observed in patients with coronary artery disease, hypertensive heart disease, and hypertrophic cardiomyopathy.
- Clinical improvement often correlates with enhanced diastolic function.
Conclusions:
- The beneficial effects of calcium entry blockers on diastolic function are likely mediated by indirect mechanisms.
- These include modulation of ventricular loading, sympathetic reflexes, and myocardial oxygen supply-demand balance.
- Direct effects on myocyte calcium influx may not be the primary driver of these clinical benefits.
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