No abstract available
MeSH terms
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Administration, Inhalation
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Adrenergic beta-Agonists / administration & dosage*
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Adrenergic beta-Agonists / therapeutic use
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Atropine / administration & dosage*
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Atropine / therapeutic use
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Electrocardiography
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Heart Block / diagnosis
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Heart Block / drug therapy*
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Humans
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Isoproterenol / administration & dosage*
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Isoproterenol / therapeutic use
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Male
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Middle Aged
Substances
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Adrenergic beta-Agonists
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Atropine
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Isoproterenol