to study the effects of beta-2 agonist on tracheal fluid , surfactant and pulmonary mechanics in fetal lamb lung , ritodrine hydrochloride , a preferential beta-2 agonist , was infused i.v . at a rate of 1.3 +/- 0.4 micrograms/kg/min ( mean +/- s.d . ) for 24 hr into six twin chronically catheterized fetal lambs starting between 0.86 and 0.91 gestation .
C1517163
fetal
C0015965
fetal