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Surgically induced complete heart block in the dog results in decreased levels of myocardial catecholamines. Sham operations which involve atriotomy and manipulation of the atrial septum cause less significant changes. These reductions in myocardial catecholamine levels may be due to destruction of adrenergic, intracardiac nerves or to a relatively increased utilization of catecholamines.
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Kaiser et al. (1965) studied this question.
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