“…This thesis is supported by the occurrence of 'exaggerated natriuresis' in other forms of hypertension, viz. phaeochromocytoma, hyperaldosteronism, Cushing's syndrome, and in the contralateral kidney in renovascular hypertension (Hanenson et al, 1959;Birchall et al, 1953;Birchall, Madsen & Anderson, 1964), and after elevation of blood pressure by the infusion of metaraminol (Vaamonde et al, 1964;Eisinger, 1966). Increased blood pressure, by virtue of changes in the compliance characteristics of the systemic vascular bed, might alter the systemic haemodynamic response to volume expansion OJlrych et al, 1964).…”