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A disease severity scale for systemic sclerosis: development and testing.

T A Medsger1, A J Silman, V D Steen

  • 1University of Pittsburgh, PA, USA.

The Journal of Rheumatology
|October 21, 1999
PubMed
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A new severity scale for systemic sclerosis (SSc, scleroderma) organ involvement was developed. This scale aids in patient assessment and clinical trial design for scleroderma research.

Area of Science:

  • Rheumatology
  • Autoimmune Diseases
  • Clinical Assessment Tools

Background:

  • Systemic sclerosis (SSc), or scleroderma, is a complex autoimmune disease characterized by fibrosis affecting multiple organ systems.
  • Accurate assessment of organ involvement severity is crucial for patient management and research.
  • Existing tools may not comprehensively capture the spectrum of SSc organ damage.

Purpose of the Study:

  • To develop and validate a standardized severity scale for individual organ involvements in systemic sclerosis.
  • To create a tool applicable for both cross-sectional and longitudinal patient assessment.
  • To facilitate clinical trial design and population comparisons in SSc research.

Main Methods:

  • An international group developed a glossary of variables for 9 organ systems.

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  • Prospective data collection assessed variable feasibility.
  • Mortality association was determined using 579 SSc patients; scales were consensus-driven and validated on 680 patients.

    • Main Results:

    • Nine organ-specific severity scales (0-4) were developed for systemic sclerosis.
    • The scales range from no involvement (0) to end-stage disease (4).
    • Data acquisition for the scales is practical and feasible for clinicians.

    Conclusions:

    • The developed severity scale offers a preliminary tool for assessing SSc in individual patients over time.
    • This scale is valuable for designing and conducting clinical trials in SSc.
    • The scale provides a foundation for a future scleroderma disease activity index.