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Research Article: Impact of urinary sodium excretion on the prevalence and incidence of metabolic syndrome: a population-based study

Date Published: 2023-04-26

Abstract:
Objective To evaluate the association of metabolic syndrome (MetS) risk with 24-hour urinary sodium excretion (24hUNaE) estimated from spot urine samples. Design Serial cross-sectional studies were conducted, and those with multiple repeated examinations were used to assess the MetS incidence risk. Setting and Participants A health check-up programme was conducted between 2018 and 2021 and enrolled 59?292 participants to evaluate the relationship between MetS risk and 24hUNaE in the Third Xiangya Hospital, Changsha, China. Among these participants, 9550 had at least two physical examinations during this period, which were used to evaluate the association of a new occurrence of MetS with 24hUNaE. Outcomes Guidelines for the prevention and treatment of dyslipidaemia in Chinese adults (revised in 2016) were used to define prevalent and incident MetS. Results The prevalence of MetS was 19.3% at the first check-up; among individuals aged ?55 years, the risk was higher in men than women, while among older individuals, a similar prevalence was observed in both sexes. A significant increase in MetS prevalence was observed per unit increase in 24hUNaE (adjusted OR (AOR) 1.11; 95% CI 1.09 to 1.13), especially for the prevalence of central obesity and elevated blood pressure. Additionally, 27.4% of the participants among the 7842 participants without MetS at the first check-up (male vs female: 37.3% vs 12.9%) were found to have a new occurrence of MetS at the second, third and/or fourth check-ups. A 25% increase in MetS incidence was observed per unit increase in 24hUNaE (95%?CI 1.19 to 1.32), which was more prominent in the participants with a new occurrence of central obesity and elevated fasting blood glucose. Conclusions Although the prevalence of MetS seemed stable, new occurrences of MetS remained high, which might result in MetS recurrence. The influence of sodium intake on MetS development is probably attributed to the increase in blood pressure and central obesity, but a new occurrence of MetS may develop through elevated blood glucose and central obesity.

Introduction:
Metabolic syndrome (MetS) is estimated to affect approximately one-quarter of the world’s population and is defined by the WHO as a pathological condition characterised by abdominal obesity, insulin resistance, hypertension and hyperlipidaemia. 1 Hence, MetS is not a single disease but is associated with cardiovascular diseases, diabetes, dyslipidaemia, cancer and disabilities, and has been defined by various organisations in slightly different ways. 2 With lifestyle changes and economic development, the…

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