[Pathogenetic, pathophysiological and biochemical aspects of essential hypertension (author's transl)].

Hereditary and environmental factors are involved in the pathogenesis of essential hypertension. Obesity, salt intake and stress are predominant among the environmental influences. Autonomous nervous dysfunction, increased contractility of vascular smooth muscle cells and impaired renal handling of sodium are major abnormalities in essential hypertension. At present it cannot be decided if alterations in the activities of systemic or renal hormonal systems reflect primary defects or adaptive changes in the regulation of blood pressure. In any case the kidney is regarded to have a key position in the long term increase of blood pressure in essential hypertension. Recent studies in essential hypertensive patients suggest that renin release decreases as renal vascular resistance increases. Studies from our laboratory have shown that renal prostaglandins are intrinsic to the renin release mechanism from the kidney. Additionally, there is evidence that renal prostaglandin synthesis is disturbed in essential hypertension, either primarily or secondarily, leading to unresponsive renin secretion. Further studies on the interrelationships of other hormonal systems and on hormone-receptor interactions in the vascular wall are necessary to delineate more precisely the mechanisms which are operative in the pathogenesis and manifestation of essential hypertension.