UV-B phototherapy clears psoriasis through local effects

被引:31
作者
Dawe, RS [1 ]
Cameron, H [1 ]
Yule, S [1 ]
Man, I [1 ]
Ibbotson, SH [1 ]
Ferguson, J [1 ]
机构
[1] Univ Dundee, Ninewells Hosp & Med Sch, Photobiol Unit, Dept Dermatol, Dundee DD1 9SY, Scotland
关键词
D O I
10.1001/archderm.138.8.1071
中图分类号
R75 [皮肤病学与性病学];
学科分类号
100206 ;
摘要
Objective: To determine if UV-B phototherapy clears psoriasis through systemic effects. Design: Randomized, within-subject comparison of change in psoriasis in 3 plaques in patients attending for whole-body UV-B therapy. Change in patients' psoriasis plaques covered during UV-B treatment was compared with plaques in an untreated control group. Setting: University hospital phototherapy unit. Patients: The study population comprised 17 patients with chronic plaque psoriasis treated with UV-B and 24 psoriasis control patients awaiting UV-B phototherapy. Interventions: Treatment with a standard 3-times weekly narrowband TL-01 UV-B regimen. Three similar plaques were randomly allocated to be covered every treatment, covered for 2 of 3 weekly treatments, and exposed to local UV-B every treatment. Similar plaques were selected in control patients (awaiting but not yet started UV-B therapy). Severity of psoriasis plaques was assessed using a scaling, erythema, and induration (SEI) scoring system. Main Outcome Measures: Change in SEI score of the selected plaques over the complete treatment course for UV-B-treated Patients and change over 3 weeks in SEI score of plaques covered during UV-B,treatment compared with that of plaques in controls. Results: There was a significant (P<.001) difference in how much the SEI score changed in the 3 plaques in UV-B-treated patients. It fell by a mean of 7.6 for uncovered plaques compared with 3.2 for plaques covered during each UV-B exposure (95% confidence interval for difference, 3.0 to 5.8). In patients awaiting UV-B, SEI score of plaques fell by a mean of 0.4 over 3 weeks, compared with a mean fall of 1.4 for covered plaques in UV-B-treated patients (95% confidence interval for difference in means, 0.1 to 2.0). Conclusions: If UV-B therapy has any systemic effect capable of improving psoriasis, this effect is small and unlikely to be of clinical importance. It is insufficient to alter interpretation of findings of within-subject comparative phototherapy studies. UV-B phototherapy works for chronic plaque psoriasis through local effects.
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收藏
页码:1071 / 1076
页数:6
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