Effect of Low Salt and Ckd Progression
- Conditions
- Blood PressureProteinuriaCKD Progression
- Interventions
- Dietary Supplement: Low salt diet
- Registration Number
- NCT05716386
- Brief Summary
Whether an intensive short-term dietary sodium restricted intervention will have beneficial effects on the glomerular filtration rate (GFR) and on the susceptibility to develop proteinuria, both measures of kidney function will be the objective of this study
- Detailed Description
The prevalence of non-communicable disease (NCD including cardiovascular disease (CVD), diabetes mellitus (DM),hypertension(HT) and chronic kidney disease(CKD) continues to rise all over the world and lead to global crisis.The world Health Organization (WHO) shows that more than 50% of the burden of diseases arise from NCD and 30% is attributed to CVD\[1\] .In Thailand,the prevalence of high blood pressure in population age \> 15 is increasing in the past 10 years .In 2022 the HT prevalence was 21.4 and the admission rate of CVD increased from 109.4 to 793.3 per 100,000 population \[2\]. Cumulating evidence highlights that higher sodium consumption contributes to higher BP \[3\], thus increasing the risk of cardiovascular disease (CVD) \[4,5\]. According to the World Health Organization, the restriction of sodium intake to less than 2.3 g/day of sodium corresponding to 5.8 g of salt (or 100 mmol) is one of the most cost-effective measures to improve public health \[6\]. In particular, in a large cohort study in over 100,000 patients from 18 countries the role of higher salt consumption was associated with increased BP levels \[7\], and poor CV outcomes \[8\].In one meta-analysis ,reduce salt intake to 1,800 mg per day will help reduce blood pressure by 2/1 mmHg in non-hypertensive cohorts and 5/2.7 mmHg in hypertensive patients \[4\].In fact, even minor sodium restriction for only 700-800 mmol/day was associated with reduction of CVD and mortality risks for 20 and 5-7% respectively.
A long-standing line of evidence also shows beneficial effects of salt reduction in patients with chronic kidney disease (CKD) as well as in healthy people \[9,10\]. A recent review of the evidence for the relationship between salt intake and CKD progression concluded there is consistent evidence to suggest that dietary salt intake is linked with albuminuria and tissue injury \[9\] \[11\]. High salt intake is closely associated with the progression of CKD. When the urine sodium-to-creatinine ratio increases by 100 mmol/L, the risk of CKD developing into end-stage renal disease (ESRD) increases by 1.61 times \[12,13\]. High salt intake leads to renal impairment in various ways, including increasing transforming growth factor (TGF)-β1 production and enhancing oxidative stress and inflammatory response kidney \[14-16\]. The Lowsalt CKD trial trials had shown that in patients with CKD, salt reduction will have additional beneficial effects on renal effects, reduction of proteinuria,independent of blood pressure lowering effect. reported that salt reduction helped control blood pressure,reduce proteinuria \[17\] .However,the follow up time was too short. Meta-analysis data from Garofalo et al \[18\] indicates that low sodium intake ( 4.4 gm/day) in 738 CKD patients from 9 studies significantly reduce systolic blood pressure by 4.9 mmHg (95%CI 6.8/31 mmHg, p \<0.001) .The diastolic blood pressure also reduce by 2 mmHg (95%CI 6.8/3.1 mmHg, P\<0.001) .In CRIC study\[19\] which followed a cohort of 3,757 CKD patients for nearly 7 years,the authors found that the high urine sodium group (UNaV \> 195 mmoL/day) significantly increased risk for CKD progression and CVD risk. These data support the evidence that reducing dietary sodium can reduce cardiovascular risk and rate of CKD progression.
However, restriction in dietary sodium intake also activates the renin-angiotensin -aldosterone system (RAAS) and sympathetic nervous system\[20,21\].Low dietary sodium has been reported to be associated with insulin resistance \[22\]. To date, the connection between sodium intake and CKD progression provided inconsistent results \[23\]. Although several studies have shown that high dietary sodium intake increases the risk of CKD development or progression \[24-26\], some results failed to find significant connections to renal outcome \[27-30\]. In addition, there have also been reports that lower 24-hour urine sodium excretion is associated with higher risk of death and ESRD in individuals with type 1 and type 2 diabetes with overt proteinuria \[30,31\]. Whether an intensive short-term dietary sodium restricted intervention will have beneficial effects on the glomerular filtration rate (GFR) and on the susceptibility to develop proteinuria, both measures of kidney function will be the objective of this study
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- All
- Target Recruitment
- 200
- years with CKD stage 1-3 (estimated glomerular filtration rate (eGFR) of 30-59 ml/min per 1·73 m2
- No recent history of acute illness or hospitalization
- BP >135/85 mmHg or controlled BP with the use of antihypertensive medications.
- Serious primary diseases affecting major organs such as the heart, brain, lung, liver, or hematopoietic system
- Active cancers
- Acute infectious diseases
- Pregnancy
- Post solid organs transplantation
- Terminally ill.
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- PARALLEL
- Arm && Interventions
Group Intervention Description Control Low salt diet The control group will continue with their usual diet and record the food recall Intervention Low salt diet The low sodium diet will be provided low salt diet 1.5 gm/day in three main meals for three months.The food will be provided by the nutritionists and delivered directly to their home
- Primary Outcome Measures
Name Time Method Rate of GFR decline 3 months estimeated glomerular filtration rate
- Secondary Outcome Measures
Name Time Method Acid-base status 3 months Electrolyte level
Blood pressure status 3 months Blood pressure
Calcium-phosphate balance 3 months calcium,phosphorus level
Proteinuria 3 months 24 hour urine protien level
Trial Locations
- Locations (1)
Faculty of Medicine,Vajira Hospital,Navamindradhiraj University
🇹🇭Bangkok, Thailand