答:脑垂体后叶素治疗中、大量肺出血具有明显效果,为临床广泛采用。动物实验证明,不同的血管收缩药静注可使全身血压增高,肺循环血压下降,而促使肺出血停止,其中以脑垂体后叶素效果最明显。因此,脑垂体后叶素的止血作用为静脉注射后使肺血管收缩、肺循环血压下降,肺部血管破坏处得以进行血块的 A: Pituitrin treatment, a large number of pulmonary hemorrhage has a significant effect, widely used for clinical. Animal experiments show that different vasoconstrictor intravenous injection can make systemic blood pressure, pulmonary blood pressure decreased, and to stop bleeding in the lung, in which pituitrin effect most obvious. Therefore, the role of the pituitrin hemostasis after the intravenous injection of pulmonary vasoconstriction, decreased pulmonary blood pressure, pulmonary vascular destruction at the clot