No abstract available
MeSH terms
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Aged
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Arrhythmia, Sinus / diagnosis
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Arrhythmia, Sinus / drug therapy*
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Atropine
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Bradycardia / diagnosis
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Bradycardia / drug therapy*
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Cardiac Pacing, Artificial
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Electrocardiography
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Electrophysiology
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Humans
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Propranolol
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Sinoatrial Node / drug effects*
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Theophylline / therapeutic use*
Substances
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Atropine
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Propranolol
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Theophylline