The effects of
atrial natriuretic factor (
ANF) were evaluated in rats with chronic aorto-caval (A-V)
fistula. In this experimental model of high-output
heart failure, the animals display elevated atrial pressure and systemic vasodilation, but avidly retain
sodium. Experiments were performed on Munich-Wistar rats, 8 to 14 days after placement of an infrarenal
surgical anastomosis (side-to-side, 0.9 +/- 0.2 mm) and on
sham operated controls. Infusion of synthetic
ANF (3-28) intravenously (5 micrograms/kg prime; 0.17 microgram/kg.min) resulted in increases in urine flow (V) and fractional
sodium excretion (FENa) and decreases in blood pressure (BP) that were significantly attenuated in rats with A-V
fistula compared to controls. To control for the lower baseline BP that was present in rats with A-V
fistula, a second series of studies was performed in which renal perfusion pressure was reduced in normal rats to 110 mm Hg with a servocontrolled pneumatic cuff.
ANF infusion to this group led to significant increases in glomerular filtration rate (GFR), V and FENa that were greater than those seen in rats with A-V
fistula (FENa = 2.7 +/- 0.3% vs. 0.48 +/- 0.12%, P less than 0.05). Thus, the moderately reduced BP in rats with A-V
fistula did not account for the blunted response to
ANF. To investigate whether the renal sensitivity to
ANF is altered in this model, an additional series of experiments were performed in which
ANF was infused over a range of doses (0.08 to 2.5 micrograms/kg.min) to both groups of rats.(ABSTRACT TRUNCATED AT 250 WORDS)