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Title: Associations of urinary sodium excretion with cardiovascular events in individuals with and without hypertension : A pooled analysis of data from four studies
Authors: Mente, Andrew
O’Donnell, Martin J.
Rangarajan, Sumathy
Dagenais, Gilles
Lear, Scott A.
McQueen, Matthew J.
Diaz, Rafael
Avezum, Alvaro
López Jaramillo, Patricio
Lanas, Fernando
Li, Wei
Lu, Yin
Yi, Sun
Rensheng, Lei
Iqbal, Romaina
Mony, Prem
Yusuf, Rita
Yusoff, Khalid
Szuba, Andrzej
Oguz, Aytekin
Rosengren, Annika
Bahonar, Ahmad
Yusufali, Afzalhussein
Schutte, Aletta Elisabeth
Chifamba, Jephat
Mann, Johannes F. E.
Anand, Sonia S.
Teo, Koon
Yusuf, Salim
Issue Date: 30-Jul-2016
Abstract: Background: Several studies reported a U-shaped association between urinary sodium excretion and cardiovascular disease events and mortality. Whether these associations vary between those individuals with and without hypertension is uncertain. We aimed to explore whether the association between sodium intake and cardiovascular disease events and all-cause mortality is modified by hypertension status. Methods: In this pooled analysis, we studied 133118 individuals (63559 with hypertension and 69559 without hypertension), median age of 55 years (IQR 45–63), from 49 countries in four large prospective studies and estimated 24-h urinary sodium excretion (as group-level measure of intake). We related this to the composite outcome of death and major cardiovascular disease events over a median of 4·2 years (IQR 3·0–5·0) and blood pressure. Findings: Increased sodium intake was associated with greater increases in systolic blood pressure in individuals with hypertension (2·08 mm Hg change per g sodium increase) compared with individuals without hypertension (1·22 mm Hg change per g; pinteraction<0·0001). In those individuals with hypertension (6835 events), sodium excretion of 7 g/day or more (7060 [11%] of population with hypertension: hazard ratio [HR] 1·23 [95% CI 1·11–1·37]; p<0·0001) and less than 3 g/day (7006 [11%] of population with hypertension: 1·34 [1·23–1·47]; p<0·0001) were both associated with increased risk compared with sodium excretion of 4–5 g/day (reference 25% of the population with hypertension). In those individuals without hypertension (3021 events), compared with 4–5 g/day (18508 [27%] of the population without hypertension), higher sodium excretion was not associated with risk of the primary composite outcome (≥7 g/day in 6271 [9%] of the population without hypertension; HR 0·90 [95% CI 0·76–1·08]; p=0·2547), whereas an excretion of less than 3 g/day was associated with a significantly increased risk (7547 [11%] of the population without hypertension; HR 1·26 [95% CI 1·10–1·45]; p=0·0009). Interpretation: Compared with moderate sodium intake, high sodium intake is associated with an increased risk of cardiovascular events and death in hypertensive populations (no association in normotensive population), while the association of low sodium intake with increased risk of cardiovascular events and death is observed in those with or without hypertension. These data suggest that lowering sodium intake is best targeted at populations with hypertension who consume high sodium diets. Funding: Full funding sources listed at end of paper (see Acknowledgments).
Description: 12 p.
ISSN: 0140-6736
Appears in Collections:DCABA. Artículos de Investigación

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