Carotid intima media thickness is independently associated with urinary sodium excretion in patients with chronic kidney disease
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Chronic Kidney Disease and the Risk of Atherosclerosis
Atherosclerosis-induced premature vascular diseases represent the primary cause of mortality among individuals diagnosed with chronic kidney disease (CKD). While the exact pathogenetic mechanisms of atherosclerosis in CKD patients are not yet fully elucidated, experimental research highlights a critical link to dietary habits. Specifically, high dietary sodium intake is known to increase circulatory volume and blood pressure while facilitating atherosclerotic development by reducing the bioavailability of nitric oxide through oxidative stress.
Investigating the Link Between Sodium and Vascular Health
This study aimed to investigate the direct relationship between sodium consumption and carotid artery intima-media thickness (CIMT), a validated indicator of atherosclerosis. To ensure accuracy, researchers utilized daily urinary sodium excretion as a reliable biomarker for sodium intake. The study group consisted of 193 non-diabetic patients with stage 2–4 CKD who had no prior history of atherosclerotic disease.
Key Findings on Sodium Consumption Levels
The research revealed concerning data regarding the dietary habits of CKD patients. The findings indicated that 77% of the participants consumed more than 2 grams of sodium per day, which exceeds the recommended upper limit for patients with chronic kidney disease. This excessive intake is a significant factor in the progression of vascular complications.
Correlation Analysis of Carotid Artery Intima-Media Thickness
The study identified several clinical parameters that correlate with the progression of atherosclerosis. A positive linear correlation was observed between carotid artery intima-media thickness and the following factors:
- Patient age (p < 0.001)
- C-reactive protein (CRP) (p < 0.001)
- Urinary sodium excretion (p < 0.001)
- Body mass index (BMI) (p = 0.002)
- Systolic blood pressure (p = 0.002)
- Hemoglobin levels (p = 0.030)
- Triglycerides (p = 0.043)
- Diastolic blood pressure (p = 0.049)
Conversely, a negative linear correlation was found between CIMT and the glomerular filtration rate (GFR) (p = 0.008), suggesting that as kidney function declines, vascular thickness increases.
Sodium as an Independent Determinant of Atherosclerosis
One of the most significant outcomes of this research is that urinary sodium excretion serves as an independent determinant of intima-media thickness. Even after adjusting for all other associated factors, the data showed a measurable impact on vascular structure:
| Variable | Impact on Intima-Media Thickness (CIMT) | P-Value |
|---|---|---|
| 2g Increase in Daily Sodium | 0.031 mm increase (0.004–0.059 mm) | p = 0.025 |
Conclusion: The Necessity of Sodium Restriction
In conclusion, the results demonstrate a clear and significant relationship between urinary sodium excretion and carotid artery intima-media thickness. The evidence suggests that excessive sodium consumption directly predisposes patients with CKD to the development of atherosclerosis, emphasizing the critical need for dietary management in clinical practice.
