(Hypertension. 1995;26:610-615.)
© 1995 American Heart Association, Inc.
Articles |
Combined Renal Effects of Overweight and Hypertension
From the Department of Medicine, Hôpital Lapeyronie, Montpellier, France.
Correspondence to Jean Ribstein, MD, Department of Medicine, Hôpital Lapeyronie, 34295 Montpellier Cedex 5, France.
Abstract The existence of a direct relationship between body mass and arterial pressure is well recognized; however, the effect of obesity on known target organs of hypertension is not clearly understood. We undertook the present studies to assess the influence of obesity on renal function and urinary albumin excretion in 40 normotensive subjects and 80 never-treated hypertensive patients matched for age, sex, arterial pressure level, and known duration of hypertension in whom an oral glucose tolerance test was within normal limits. Glomerular filtration rate and effective renal plasma flow (expressed as absolute values or values normalized for height) were increased in overweight compared with lean subjects whether normotensive or hypertensive. Glomerular filtration rate was positively correlated with protein intake (as assessed from urinary excretion of urea) and fasting serum insulin level. Urinary excretion of albumin but not IgG and ß2 microglobulin was higher in hypertensive patients compared with normotensive subjects. The overweight condition clearly enhanced the influence of arterial pressure on albuminuria; in fact, a steeper regression line between albumin excretion rate and arterial pressure was found in overweight compared with lean subjects. These results indicate that the overweight condition is associated with renal hyperfiltration and hyperperfusion, irrespective of the presence of hypertension, and that obesity magnifies the effect of hypertension on albuminuria, thus raising the possibility of an increased susceptibility of obese hypertensive patients to the development of renal damage.
Key Words: hypertension, essential • albuminuria • obesity • glomerular filtration rate • renal circulation • insulin
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