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In six conscious, trained dogs, maintained on a normal sodium intake of 2 to 4 mEq/kg/day, sympathetic activity was assessed as the release rate of norepinephrine and epinephrine during 15-minute i.v. infusions of human alpha-atrial natriuretic factor. Mean arterial pressure (as a percentage of control +/- SEM) during randomized infusions of 0.03, 0.1, 0.3, or 1.0 microgram/kg/min was 99 +/- 1, 95 +/- 1 (p less than 0.05), 93 +/- 1 (p less than 0.01), or 79 +/- 6% (p less than 0.001), respectively, but no tachycardia and no augmentation of the norepinephrine release rate (up to 0.3 microgram/kg/min) were observed, which is in contrast to comparable hypotension induced by hydralazine or nitroglycerin. The release rate of epinephrine (control, 6.7 +/- 0.6 ng/kg/min) declined immediately during infusions of atrial natriuretic factor to a minimum of 49 +/- 5% of control (p less than 0.001) during 0.1 microgram/kg/min and to 63 +/- 5% (0.1 greater than p greater than 0.05) or 95 +/- 13% (not significant) during 0.3 or 1.0 microgram/kg/min. Steady state arterial plasma concentrations of atrial natriuretic factor were 39 +/- 10 pg/ml (n = 6) during infusions of saline and 284 +/- 24 pg/ml (n = 6) and 1520 +/- 300 pg/ml (n = 9) during 0.03 and 0.1 microgram/kg/min infusions of the factor.(ABSTRACT TRUNCATED AT 250 WORDS)

Inhibition of sympathoadrenal activity by atrial natriuretic factor in dogs.