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Several blood-pressure-regulating factors including exchangeable sodium, blood volume, plasma renin, aldosterone, norepinephrine (NE), and epinephrine (E) levels, urinary catecholamine excretion rates, and cardiovascular responsiveness to infused NE and angiotensin II (AII) were compared among age-matched subgroups of normal subjects (15 with normal weight, 15 with overweight) and patients with essential hypertension (15 with either normal weight, overweight, or obesity). Exchangeable sodium, blood volume, plasma and urinary sodium and potassium, plasma renin, aldosterone and epinephrine levels, and NE or E excretion rates did not differ significantly among the five subgroups. Minimal differences included a slightly higher heart rate in overweight patients than in overweight normal subjects (p less than 0.01) and a tendency for a higher plasma NE in overweight than in normal weight patients. Plasma NE obtained immediately before NE infusion as well as the plasma clearance of NE did not differ among the five subgroups except, however, for a somewhat low NE clearance in obese patients. The NE pressor dose tended to be lower in normal-weight hypertensive than in normal-weight normotensive subjects. No alteration was apparent in overweight or obese hypertensive patients. Pressor responses to AII were similar in the different subgroups. These findings suggest that overweight does not confer a unique aberration in the body sodium-volume state, circulating renin, aldosterone or catecholamines, or cardiovascular responses to NE or AII which result in hypertension.

Pressor factors and cardiovascular pressor responsiveness in lean and overweight normal or hypertensive subjects.