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  • Title: Clinical significance of intrarenal vascular lesions in non-hypertensive patients with IgA nephropathy.
    Author: Huang Z, Hu Y, Chen B, Liang Y, Li D, Qiu W, Zhang J, Chen C.
    Journal: J Nephrol; 2023 Mar; 36(2):429-440. PubMed ID: 36538201.
    Abstract:
    BACKGROUND: The clinical significance of intrarenal vascular lesions has not been elucidated in primary IgA nephropathy (IgAN), especially in non-hypertensive subjects. METHODS: From January 2003 to December 2020, data of 3435 patients with biopsy-proven IgAN were reviewed. Two hundred-forty non-hypertensive patients who met the criteria for IgAN and had intrarenal vascular lesions (IgAN-vas) were selected. The control cohort was constructed with 1:1 matched cases of non-hypertensive IgAN patients without vascular lesions according to age, gender, estimated glomerular filtration rate (eGFR) and follow-up time. RESULTS: The IgAN-vas cohort had significantly higher serum uric acid levels than the control IgAN cohort (P < 0.05); glomerulosclerosis was more common in IgAN-vas patients. Moreover, cluster analysis indicated that the serum uric acid level was associated with serum creatinine (s-Cr) levels in IgAN-vas while it was associated with serum lactate dehydrogenase (LDH) levels in control cases with IgAN. Both Kaplan-Meier analysis and generalized linear mixed-effects models revealed that the prognosis of the IgAN-vas cohort was significantly worse than that of the IgAN cohort after > 5 years of follow-up. Intimal thickening was an independent risk factor associated with reaching the endpoint (eGFR decrease ≥ 30% from the baseline or reaching end-stage renal disease [ESRD] or death). CONCLUSIONS: The prognosis of non-hypertensive patients with IgAN-vas was worse than that of matched individuals with IgAN. The clinicopathologic manifestation of IgAN-vas was more severe, and included a higher proportion of glomerulosclerosis, and a higher serum uric acid level correlated with renal function impairment.
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