Journal
BRITISH JOURNAL OF DERMATOLOGY
Volume 159, Issue 4, Pages 887-894Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2133.2008.08711.x
Keywords
CAT; CDASI; dermatomyositis; DSSI; outcome instrument; severity index
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Funding
- National Institutes of Health [NIH K24-AR 02207]
- Veterans Affairs Merit Review
- The Richard and Adeline Fleischaker Chair in Dermatology Research at Richard and Adeline Fleischaker Chain in Dermatol Research at the University of Oklahoma Health Sciences Center (Dr Sontheimer)
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Background Reliable and validated measures of skin disease severity are needed for cutaneous dermatomyositis (DM). Cutaneous Dermatomyositis Disease Area and Severity Index (CDASI), Dermatomyositis Skin Severity Index (DSSI) and Cutaneous Assessment Tool (CAT) skin indices have been developed as outcome instruments. Objectives We sought to demonstrate reliability and validity of the CDASI, and to compare the CDASI with other potential tools for use in measuring disease severity in cutaneous dermatomyositis. Patients and Methods CDASI has four activity and two damage measures, with scores from 0 to 148. DSSI assesses activity based on body surface area and severity on a scale of 0-72. CAT uses 21 activity and damage items, for a range of 0-175 for activity and 0-33 for damage. Ten dermatologists used the instruments to score the same 12-16 patients in one session. Global validation measures were administered to physicians and patients. Results Global validation measures correlated with the three outcome instruments (P < 0.0001). CAT displayed lower inter- and intrarater reliability relative to the CDASI. All scales correlate better with physician than patient global skin measures. Conclusions It appears that the CDASI may be a useful outcome measure for studies of cutaneous DM. Further testing to compare responsiveness of all three measures is necessary.
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