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Hemodynamics and Vascular Hypertrophy in African Americans and Caucasians With High Blood Pressure.

Abstract：

BACKGROUND:Hypertension in African Americans is characterized by greater systemic vascular resistance (SVR) compared with Caucasian Americans, but the responsible mechanisms are not known. The present study sought to determine if peripheral vascular hypertrophy is a potential mechanism contributing to elevated SVR in African Americans with high blood pressure (BP). METHODS:In a biracial sample of 80 men and women between the ages of 25 and 45 years, with clinic BP in the range 130/85-160/99mm Hg, we assessed cardiac output and SVR, in addition to BP. Minimum forearm vascular resistance (MFVR), a marker of vascular hypertrophy, also was assessed. RESULTS:SVR was elevated in African Americans compared with Caucasians (P < 0.001). Regression models indicated that age, body mass index, 24-hour diastolic BP, and ethnicity were significant predictors of SVR. There was also a significant interaction between ethnicity and MFVR in explaining SVR in the study sample. In particular, there was a significant positive association between MFVR and SVR among African Americans (P = 0.002), whereas the association was inverse and not statistically significant among Caucasians (P = 0.601). CONCLUSION:Hypertrophy of the systemic microvasculature may contribute to the elevated SVR that is characteristic of the early stages of hypertension in African American compared with Caucasians.

journal_name

Am J Hypertens

journal_title

American journal of hypertension

authors

Hill LK,Sherwood A,Blumenthal JA,Hinderliter AL

doi

10.1093/ajh/hpw080

subject

Has Abstract

pub_date

2016-12-01 00:00:00

pages

1380-1385

issue

12

eissn

0895-7061

issn

1941-7225

pii

hpw080

journal_volume

29

pub_type

杂志文章

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