tokens: 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 )