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- ArticleBergman B, Hedner T, Lundborg P.Acta Obstet Gynecol Scand. 1978;57(4):323-6.The pressure-volume relationship in preterm rabbit lung was studied at 28 days of gestation. Injection of 0.1 mg terbutaline, a selective beta2-receptor stimulating drug, significantly increased the volume of air at equivalent low transpulmonary pressures, compared to a saline treated group and an untreated group. These findings indicate an increased pulmonary distensibility of the fetal rabbit lung after terbutaline administration. The mechanism of action is discussed and surfactant mediated effects are suggested to be the probable explanation.