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  • Title: There are no racial, age, sex, or weight differences in the effect of salt on blood pressure in salt-sensitive hypertensive patients.
    Author: Chrysant SG, Weir MR, Weder AB, McCarron DA, Canossa-Terris M, Cohen JD, Mennella RF, Kirkegaard LW, Lewin AJ, Weinberger MH.
    Journal: Arch Intern Med; 1997 Nov 24; 157(21):2489-94. PubMed ID: 9385301.
    Abstract:
    BACKGROUND: This report is part of a larger, multicenter, placebo-controlled study designed to test the effects of low and high salt intake on the antihypertensive action of enalapril maleate or isradipine in salt-sensitive, hypertensive patients. OBJECTIVE: To present our findings with respect to the effects of race, age, sex, and weight on the blood pressure response to low and high salt intake in salt-sensitive hypertensive patients before randomization into the larger study. PATIENTS AND METHODS: After 3 week (weeks -9 to -6) of ad lib salt intake (100-200 mmol/d of sodium), 1916 patients whose sitting diastolic blood pressure was between 95 and 115 mm Hg entered a 3-week period (week -6 to -3) of low salt intake (50-80 mmol/d of sodium) and then a 3-week period (week -3 to 0) of high salt intake (200-250 mmol/d of sodium). Of the 1916 patients, 624 were identified as being sensitive to salt by demonstrating an increase in sitting diastolic blood pressure of equal to or more than 5 mm Hg from the low to high salt intake. Of these patients, 367 were white, 156 were black, 92 were Hispanic, 8 were Asian, and 1 was American Indian. Also, 315 were men and 309, women; 351 were 55 years or younger and 273 were older than 55 years; and 195 had a body mass index of 27 or less and 429 had a body mass index higher than 27. RESULTS: The sitting blood pressure decreased with salt restriction and increased with salt load in all groups of patients (P < .001). There were no statistically significant differences in the blood pressure changes to salt changes by race, age, sex, and weight. CONCLUSIONS: This large, multicenter study did not demonstrate any statistically significant effect of race, age, sex, and weight on blood pressure response to salt changes in salt-sensitive hypertensive patients.
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