GN in Ten
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Board Review Bonus 7: Membranous Nephropathy

GN in Ten
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Board Review Bonus 7: Membranous Nephropathy

In this "Board Review Bonus" (BRB) episode, hosts Dr. Kenar Jhaveri and Dr. Koyal Jain deliver a high-yield clinical overview of membranous nephropathy (MN)—a classic, board-favorite cause of nephrotic syndrome. Utilizing a real-world case of a 50-year-old male presenting with heavy proteinuria and severe hypoalbuminemia, they walk through diagnostic dilemmas, pathological clues, and the modern therapeutic landscape. Whether you are studying for the boards or looking to "class-switch" your clinical knowledge from IgG1 to IgG4, this bite-sized episode is packed with essential clinical pearls.

Key Topics Covered:

  • Epidemiology & Biopsy Basics: Identifying MN as one of the most common causes of adult nephrotic syndrome. The hosts break down classic pathology features: diffuse GBM thickening on light microscopy, "spikes" on silver stain, granular IgG and C3 immunofluorescence, and subepithelial dense deposits on EM.
  • The Antigen Revolution: A review of how the 2009 discovery of anti-PLA2R antibodies on podocytes transformed the diagnosis of primary MN. They also highlight newer antigens to know for the boards, including NELL-1 (associated with malignancy, medications, and lipoic acid), THSD7A (associated with malignancy), and EXT1/EXT2 (associated with lupus).
  • Investigating Secondary Causes: Why age-appropriate malignancy screening, medication reviews, and infectious workups (syphilis, hepatitis B and C) are essential even in PLA2R-positive cases. Key biopsy clues like "full house" staining or endothelial tubuloreticular inclusions can help tip you off to a secondary etiology.
  • The "Koyal-Kenar" Risk Stratification: Why tracking immunological remission via anti-PLA2R titers is often far more predictive than following proteinuria alone. The hosts outline when to initiate immunosuppression based on GFR decline, severe proteinuria/complications, or stable/rising anti-PLA2R titers.
  • Conservative Therapy (The CKD Toolkit): Standard management including low-sodium diets, maximal RAAS blockade, statins (mindful of CNI interactions), SGLT2 inhibitors, and prophylactic anticoagulation (using apixaban or warfarin) when albumin drops below 2.0–2.5 g/dL.
  • The Immunosuppressive Toolkit: Navigating the "big three" regimens: the highly effective but complex 6-month Modified Ponticelli Regimen, first-line Rituximab (backed by the MENTOR trial), and Calcineurin Inhibitors (useful as a bridge, but limited by high relapse rates). Plus, a sneak peek at obinutuzumab (the Majesty trial) for deeper B-cell depletion.

Recommended Literature:

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