Abstract
Purpose
It is unclear whether long-term variability in low-density lipoprotein cholesterol (LDL-C) is associated with clinical outcomes in patients with nephrotic syndrome (NS).
Methods
A large cohort of 1100 patients with primary NS underwent treatment and regular follow-up. Long-term variability in LDL-C was assessed by calculating its weighted standard deviation (w-SD). The primary endpoints of this study were the occurrence of arteriosclerotic cardiovascular disease (ASCVD) or kidney dysfunction. Factors associated with the w-SD of LDL-C were evaluated by linear regression. Associations of the w-SD of LDL-C with clinical outcomes were evaluated by Cox proportional hazards regression.
Results
Over a median follow-up of 44.8 (interquartile range, 26.8, 70.1) months, 198 patients developed ASCVD (45.9 cases per 1,000 patient-years), and 84 patients developed kidney dysfunction (17.6 cases per 1,000 patient-years). The incidence rates of the primary outcomes increased across the quartiles of the w-SD of LDL-C (log-rank, P < 0.001). Multivariate Cox regression analysis showed that higher LDL-C variability was associated with an increased risk of ASCVD [hazard ratio (HR), 2.236; 95% confidence interval (CI), 1.684–2.969, P < 0.001] and an increased risk of kidney dysfunction (HR, 3.047; 95% CI 2.240–4.144, P < 0.001). The results were similar after adjusting the w-SD of LDL-C by its related parameters (baseline and mean LDL-C as well as mean total cholesterol), although the mean LDL-C was also an independent risk factor for ASCVD and kidney dysfunction.
Conclusion
Long-term variability in LDL-C was independently associated with the risk of ASCVD and kidney dysfunction in NS patients.
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Data availability
The data underlying this article are available in the article and in its online supplementary material.
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Acknowledgements
We thank Jin-ying Wang for providing technical support.
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This work was supported by grants from the Natural Science Foundation of China (81870486, 82070732, and 82090021).
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Lai, X., Cui, Z., Zhang, H. et al. Long-term visit-to-visit variability in low-density lipoprotein cholesterol is associated with poor cardiovascular and kidney outcomes in patients with primary nephrotic syndrome. Int Urol Nephrol 55, 1565–1574 (2023). https://doi.org/10.1007/s11255-023-03467-7
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DOI: https://doi.org/10.1007/s11255-023-03467-7