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Defining Difficult-to-Treat and Complex-to-Manage Psoriatic Arthritis

May 16, 2025 · 15 min

Show notes

In this compelling episode of Inside GRAPPA, host Dr. Hanna Johnsson, a rheumatologist based in Scotland, leads an important conversation on one of the most pressing issues in psoriatic arthritis (PsA) care: what truly makes a case difficult to treat or complex to manage?


Dr. Johnsson is joined by two experts deeply embedded in the GRAPPA initiative to define these concepts:

  • Dr. Fabian Proft, Head of the Division of Rheumatology at Charité Berlin, Germany, and long-time GRAPPA contributor.
  • Dr. Shikha Singla, Assistant Professor of Medicine at the Medical College of Wisconsin, who brings firsthand experience from her combined rheum-derm clinic.


Together, they unpack the background, progress, and patient-centered approach of the Difficult-to-Treat (D2T) and Complex-to-Manage PsA Project.


✅ Highlights
  • Clearer definitions aim to improve care for patients with persistent symptoms despite treatment
  • “Difficult to treat” focuses on ongoing inflammation; “complex to manage” accounts for non-inflammatory factors
  • A global literature review revealed inconsistent criteria in defining treatment challenges
  • Surveys of clinicians and patients shaped a more inclusive, consensus-driven framework
  • New definitions to be presented at EULAR—marking a major milestone in PsA research


⏱ Timestamps
  • 00:00 – Introduction to the episode and today’s topic
  • 00:36 – Guest introductions: Dr. Fabian Proft and Dr. Shikha Singla
  • 01:00 – Fabian on the need for better definitions and understanding treatment failure
  • 04:12 – Defining the terms: inflammation vs. non-inflammatory drivers of disease burden
  • 05:15 – Why “complex to manage” is more appropriate than “difficult patient”
  • 06:00 – How terminology shapes perceptions and supports more empathetic care
  • 06:42 – Scoping literature review: methods and inconsistencies in existing definitions
  • 07:57 – Healthcare provider survey: over 200 responses, strong support for two definitions
  • 09:12 – Patient survey: nearly 600 responses and insights into global experiences
  • 10:21 – Patient-reported challenges: joint pain, fatigue, medication side effects
  • 11:54 – Cultural and social factors influencing patient experience
  • 12:39 – The Delphi process and achieving expert consensus
  • 13:15 – Project milestones: EULAR submission and upcoming publications


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