A disease-specific activity index for Wegener's granulomatosis: modification of the Birmingham Vasculitis Activity Score. International Network for the Study of the Systemic Vasculitides (INSSYS).

Published

Journal Article

OBJECTIVE: To refine and validate the Birmingham Vasculitis Activity Score (BVAS) as a disease-specific activity index for Wegener's granulomatosis (WG). METHODS: Sixteen members of the International Network for the Study of the Systemic Vasculitides (INSSYS) revised the BVAS, with 3 goals: to reduce the redundancy of some component items, to enhance its ability to capture important disease manifestations specific to WG, and to streamline the instrument for use in clinical research. We defined the items and weighted them empirically as either minor (e.g., nasal crusting = 1 point) or major (e.g., alveolar hemorrhage = 3 points). We then validated the new, disease-specific BVAS/WG in 2 simulation exercises and a clinical case series that involved 117 patients with WG. RESULTS: We removed 38 items from the original BVAS, revised 9 items, and added 7 new items. Correlations between the scores on the BVAS/WG and the physician's global assessment (PGA) of disease activity were high, even when patients in remission were excluded. In the clinical case series, Spearman's rank correlation coefficient between the BVAS/WG and the PGA was r = 0.81 (95% confidence interval 0.73-0.87). The interobserver reliability using intraclass (within-case) correlation coefficients in the 2 simulation exercises was r = 0.93 for the BVAS/WG and r = 0.88 for the PGA in the first and r = 0.91 for the BVAS/WG and r = 0.88 for the PGA in the second. There was no significant observer effect in the scoring of the BVAS/WG or the PGA. The discriminant validity of the BVAS/WG was good: r = 0.73 (95% confidence interval 0.43-0.83). CONCLUSION: The BVAS/WG is a valid, disease-specific activity index for WG. Tested in simulation exercises and in actual patients, the BVAS/WG correlates well with the PGA, is sensitive to change, and has good inter- and intraobserver reliability. The INSSYS will use the BVAS/WG to assess the primary outcome in a phase II/III trial of etanercept in WG.

Full Text

Duke Authors

Cited Authors

  • Stone, JH; Hoffman, GS; Merkel, PA; Min, YI; Uhlfelder, ML; Hellmann, DB; Specks, U; Allen, NB; Davis, JC; Spiera, RF; Calabrese, LH; Wigley, FM; Maiden, N; Valente, RM; Niles, JL; Fye, KH; McCune, JW; St Clair, EW; Luqmani, RA; International Network for the Study of the Systemic Vasculitides (INSSYS),

Published Date

  • April 2001

Published In

Volume / Issue

  • 44 / 4

Start / End Page

  • 912 - 920

PubMed ID

  • 11318006

Pubmed Central ID

  • 11318006

International Standard Serial Number (ISSN)

  • 0004-3591

Digital Object Identifier (DOI)

  • 10.1002/1529-0131(200104)44:4<912::AID-ANR148>3.0.CO;2-5

Language

  • eng

Conference Location

  • United States