[Changes of the permeability of the aortic endothelium in renovascular hypertension in the rat (preliminary data)].

The permeability of the endothelium of the aorta in hypertensive rats with normal and high plasma renin activity was studied with colloidal iron. In the former it was normal while in the latter it was markedly increased. It is concluded that the increased permeability is due to the high renin and not to the elevated blood pressure.