"Exaggerated" natriuresis in experimental hypertension and the role of the natriuretic factor

In rabbits with experimental ischaemic cerebral hypertension the role of the natriuretic factor in the genesis of the phenomenon of "exaggerated" natriuresis after extracellular space expansion was studied. In control animals an expansion of the extracellular fluid was followed by an elevation of the natriuretic factor in blood, whereas in hypertensive rabbits the phenomenon did not appear. Besides, in hypertensive rabbits the urinary excretion and the clearance of the natriuretic factor were considerably higher than in the control animals. In the genesis of exaggerated natriuresis in hypertension a certain role is doubtlessly played by the natriuretic factor.