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Beneficial effects of high-dose losartan in IgA nephritis

K-T Woo1, C-M Chan, H-K Tan

  • 1Department of Renal Medicine, Singapore General Hospital, Singapore. woo.keng.thye@sgh.com.sg

Clinical Nephrology
|May 29, 2009
PubMed

Insights

High-dose angiotensin II receptor blockers (ARBs) significantly reduced proteinuria and preserved kidney function in IgA nephritis patients over six years. This therapy may even allow for renal function recovery, unlike standard doses.

Area of Science:

  • Nephrology
  • Pharmacology
  • Immunology

Background:

  • Short-term studies indicate high-dose Angiotensin II Receptor Blockers (ARBs) reduce proteinuria in diabetic nephropathy.
  • Long-term efficacy of high-dose ARBs, specifically losartan, in IgA nephritis remains unexplored.

Purpose of the Study:

  • To investigate the long-term effects of high-dose ARB losartan on renal function and proteinuria in patients with IgA nephritis.
  • To compare high-dose ARB therapy with normal-dose ARB and ACEI (Angiotensin-Converting Enzyme Inhibitor) treatments.

Main Methods:

  • A 6-year randomized trial involving 207 IgA nephritis patients.
  • Comparison of four treatment groups: high-dose ARB (losartan 200 mg/day), normal-dose ARB (losartan 100 mg/day), normal-dose ACEI (20 mg/day), and low-dose ACEI (10 mg/day).
  • Multivariate ANOVA used to analyze the impact of treatments on estimated Glomerular Filtration Rate (eGFR) and Total Urinary Protein (TUP).

Main Results:

  • High-dose ARB group (n=63) showed significantly higher eGFR (p < 0.0005) and lower proteinuria (p < 0.005) compared to normal-dose ARB (n=43), normal-dose ACEI (n=61), and low-dose ACEI (n=40) groups.
  • Annual eGFR loss was 0.7 ml/min/year for high-dose ARB versus 3.2-3.5 ml/min/year for other groups (p = 0.0005).
  • More patients in the high-dose ARB group experienced eGFR improvement (p < 0.001).

Conclusions:

  • High-dose ARB therapy demonstrates superior efficacy in reducing proteinuria and preserving renal function in IgA nephritis compared to standard ARB and ACEI doses.
  • A notable gain in eGFR observed in Year 5 for high-dose ARB patients suggests potential for renal function recovery with long-term treatment.
Abstract

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