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[Implications of obesity for target organ injuries and cardiovascular risk factors in hypertensive subjects].

The effects of obesity on target organ injuries and cardiovascular risk factors were examined in hypertensive subjects. The subjects were 22 obese (OB-HT) and 54 nonobese (NO-HT) men with never-treated essential hypertension, and 37 obese (OB-NT) and 50 nonobese (NO-NT) normotensive men. In these 4 groups with the average age of about 50 years, we evaluated serum lipids, glucose tolerance, and hypertensive organ injuries in the heart, kidney, and optic fundus. Although the fasting blood glucose levels were similar in the 4 groups, the area under the blood glucose curve after 75 g glucose ingestion (NO-NT 15.6, OB-NT 17.5, NO-HT 15.8, OB-HT 17.6 x 10(3) mg/dl.min; p < 0.02) and the fast serum insulin level (NO-NT 7.3, OB-NT 10.1, NO-HT 7.7, OB-HT 12.2 mU/l; p < 0.001) were increased in obese men. In OB-HT, serum HDL-cholesterol was decreased (-11%, p < 0.05) and triglycerides were increased (+ 58%, p < 0.01) comparing with NO-NT. The incidence of electrocardiographic left ventricular hypertrophy was not significantly different among the 4 groups, however, urinary albumin excretion was increased in OB-HT (NO-NT 3.0, OB-NT 3.4, NO-HT 3.6, OB-HT 4.3 mg/g creatinine; p < 0.05) and sclerotic lesions of the retinal arteries were observed even in normotensive OB-NT. These data suggest that obesity unfavorably alters lipid and glucose metabolism, and facilitates organ injuries such as arteriosclerosis and renal dysfunction in hypertensive subjects.