Interim effects of salt substitution on urinary electrolytes and blood pressure in the China Salt Substitute and Stroke Study (SSaSS)

Publication date: Available online 7 January 2020Source: American Heart JournalAuthor(s): Liping Huang, Maoyi Tian, Jie Yu, Qiang Li, Yishu Liu, Xuejun Yin, Jason HY Wu, Matti Marklund, Yangfeng Wu, Nicole Li, Paul Elliot, Lijing L. Yan, Darwin R. Labarthe, Zhixin Hao, Jingpu Shi, Xiangxian Feng, Jianxin Zhang, Yuhong Zhang, Ruijuan Zhang, Bo ZhouAbstractThe Salt Substitute and Stroke Study is an ongoing 5-year large-scale cluster randomized trial investigating the effects of potassium-enriched salt substitute compared to usual salt on the risk of stroke. The study involves 600 villages and 20,996 individuals in rural China.Intermediate risk markers were measured in a random subsample of villages every 12 months over 3 years to track progress against key assumptions underlying study design. Measures of 24-hour urinary sodium, 24-hour urinary potassium, blood pressure and participants’ use of salt substitute were recorded, with differences between intervention and control groups estimated using generalized linear mixed models. The primary outcome of annual event rate in the two groups combined was determined by dividing confirmed fatal and non-fatal strokes by total follow-up time in the first 2 years.The mean differences (95% confidence interval) were -0.32 g (-0.68 to 0.05) for 24-hour urinary sodium, +0.77 g (+0.60 to +0.93) for 24-hour urinary potassium, -2.65 mmHg (-4.32 to -0.97) for systolic blood pressure and +0.30 mmHg (-0.72 to +1.32) for diastolic blood pressure. ...
Source: American Heart Journal - Category: Cardiology Source Type: research