The Relationship Between Sodium Concentrations in Spot Urine and Blood Pressure Increases: a Prospective Study of Japanese General Population: the Circulatory Risk in Communities Study (CIRCS)

Overview

Journal BMC Cardiovasc Disord

Publisher Biomed Central

Specialty Cardiology & Vascular Diseases

Date 2016 Mar 6

PMID 26944259

Citations 7

Authors

Mitsumasa Umesawa

Kazumasa Yamagishi

Hiroyuki Noda

Ai Ikeda

Shinobu Sawachi

Isao Muraki

Choy-Lye Chei

Renzhe Cui

Masanori Nagao

Tetsuya Ohira

Tomoko Sankai

Takeshi Tanigawa

Akihiko Kitamura

Masahiko Kiyama

Hiroyasu Iso

Affiliations

Soon will be listed here.

Abstract

Background: Although several cross-sectional and intervention studies showed that sodium intake or excretion was associated with blood pressure levels, no prospective study has examined the long-term association between sodium excretion in spot urine and blood pressure changes.

Methods: We conducted a prospective study of 889 normotensive subjects (295 men and 594 women, mean age 57.3 years) who underwent the baseline survey including spot urine test in 2005 and the follow-up survey in 2009 to 2011 (mean follow-up period: 5.8 years). We examined the association between sodium concentration in spot urine, a validated index of sodium excretion occurring over 24-h, and blood pressure changes between baseline and follow-up survey in all, non-overweight (body mass index(BMI) ≤ 25 kg/m(2)) and overweight normotensives.

Results: For all subjects, sodium concentrations in spot urine were not associated with either systolic or diastolic blood pressure changes. When stratified by BMI at baseline survey, sodium concentrations were positively associated with systolic blood pressure changes in non-overweight subjects, but not in overweight subjects. After adjustment for age, sex, BMI, alcohol intake status, current smoking and estimated glomerular filtration rate, the multivariable-adjusted mean values of the systolic blood pressure change among non-overweight subjects was +7.3 mmHg in the highest quartiles of sodium concentrations, while it was +3.9 mmHg in the lowest quartile (P for difference = 0.021, P for trend = 0.040). After further adjustment of baseline blood pressure levels, the association was slightly weakened; the multivariable-adjusted mean values of the systolic blood pressure changes were +7.0 mmHg and +4.2 mmHg (P for difference = 0.047, P for trend = 0.071).

Conclusions: High sodium concentrations in spot urine were associated with subsequent systolic blood pressure increases among non-overweight normotensive individuals. (272 words).

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