Understanding SLUD: A Guide to Scleroderma, Lupus & Related Autoimmune Diseases

SLUD is a mnemonic for a group of systemic autoimmune connective tissue diseases:

  • S – Scleroderma (Systemic Sclerosis)
  • L – Lupus (Systemic Lupus Erythematosus)
  • U – Undifferentiated Connective Tissue Disease (UCTD)
  • D – Dermatomyositis / Polymyositis

Shared Features

  • Autoantibodies (ANA, anti-dsDNA, anti-Scl-70, anti-Jo-1, etc.)
  • Multi-organ involvement (skin, joints, kidneys, lungs, heart, GI, CNS)
  • Female predominance (except some myositis subsets)
  • Flare-remission course

Management Principles

  • Immunosuppression: Corticosteroids, HCQ, MTX, MMF, CYC, rituximab, belimumab, tocilizumab, nintedanib.
  • Organ-specific: ACEi for scleroderma renal crisis, PPIs for GERD, calcium channel blockers for Raynaud's.
  • Monitoring: PFTs, echo, renal function, autoantibody titers.
  • Multidisciplinary: Rheumatology + pulmonology, nephrology, cardiology, dermatology.

Early diagnosis and treat-to-target improve outcomes.

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