Plasma Norepinephrine Response to Tilting in Essential Hypertension

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Abstract
A significant increase in the plasma concentration of norepinephrine on tilting 19 normal subjects from the horizontal to 60° upright is described. Evidence that this represents an increased neuroadrenergic activity to maintain cerebral circulation despite the peripheral pooling of blood has previously been reported. When 9 subjects with severe essential hypertension were similarly tilted, the rise in plasma norepinephrine concentration was insignificant. This may indicate a diminished neuroadrenergic activity in essential hypertension due to compensatory reflexes from the baroreceptor regions.