No abstract available
MeSH terms
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Action Potentials / drug effects*
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Animals
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Calcium / antagonists & inhibitors*
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Cats
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Heart / drug effects*
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In Vitro Techniques
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Myocardial Contraction / drug effects*
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Nifedipine / pharmacology*
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Papillary Muscles / drug effects
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Pyridines / pharmacology*
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Refractory Period, Electrophysiological
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Sinoatrial Node / drug effects
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Time Factors
Substances
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Pyridines
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Nifedipine
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Calcium