To determine the effects of fetal beta-2 agonist exposure on fetal hepatic glycogen metabolism, we infused ritodrine at a rate of 1.3 +/- 0.4 microgram/kg/min (mean +/- SD) for 24 h into six chronically catheterized twin fetal lambs starting between 128 and 134 days gestation. The control twins received 0.9% saline at 1.2 +/- 0.12 ml/kg/h. In addition, 15… (More)