Abstract：
:This study was designed to determine whether the increase in atriopeptin secretion induced by an intravenous infusion of norepinephrine is mediated directly by adrenergic receptor stimulation or indirectly by the associated increase in atrial pressure. Norepinephrine was infused at 0.5 microgram.kg-1.min-1 for 30 min into both sham-operated (intact) and cardiac-denervated conscious dogs. The infusion increased mean arterial pressure in all dogs. On the other hand, left atrial pressure increased from 5.0 +/- 0.7 to 9.6 +/- 1.6 mmHg (p less than 0.01) in intact dogs, but decreased from 5.5 +/- 1.0 to 2.0 +/- 0.7 (p less than 0.01) in cardiac-denervated dogs. Right atrial pressure changes followed similar trends, but were not significant in the intact group. Plasma atriopeptin increased from 73 +/- 12 to 110 +/- 18 pg/ml (p less than 0.01) as left atrial pressure increased in intact dogs and decreased from 79 +/- 15 to 54 +/- 10 pg/ml (p less than 0.01) as left atrial pressure decreased in cardiac-denervated dogs. The changes in plasma atriopeptin correlated closely with the changes in left atrial pressure (r = 0.941, p less than 0.001) and to a lesser extent with the changes in right atrial pressure (r = 0.413, p less than 0.05). These results suggest that the change in plasma atriopeptin induced by infusion of norepinephrine into conscious dogs is mediated by the concomitant change in atrial pressures.
journal_name
Life Scijournal_title
Life sciencesauthors
Zhu JL,Leadley RJ Jr,Geer PG,Wang BC,Goetz KLdoi
10.1016/0024-3205(90)90046-tsubject
Has Abstractpub_date
1990-01-01 00:00:00pages
139-45issue
2eissn
0024-3205issn
1879-0631pii
0024-3205(90)90046-Tjournal_volume
46pub_type
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