... Thus their actions in vivo depend on their specificconcentrations within the microenvironment of the alveolar wall during the course of adaptation to pulmonary hypoxia.Background Pulmonary hypertension ... pulmonary vasodilation with L-arginine in pulmonary hypertension. Circulation 1995, 92(6):1539-45.34. Mitani Y, Maruyama K, Sakurai M: Prolonged administration of L-arginineameliorates chronic ... example, the PO2 of the alveoli during the development of hypoxic pulmonary vasoconstriction and pulmonary hypertension is 5.0-8.0kPa, a value much higher than that of a systemic organunder conditions...