Gordon P M, Saunders P J, Diffey B L, Farr P M
Department of Dermatology, Royal Victoria Infirmary, Newcastle upon Tyne NE1 4LP, U.K.
Br J Dermatol. 1998 Nov;139(5):811-4. doi: 10.1046/j.1365-2133.1998.02505.x.
A device for phototesting patients prior to narrowband phototherapy is described. One hundred and fifty patients (130 with psoriasis and 20 with eczema) of skin types I-IV were phototested on the forearm and 22 on both forearm and back. The minimal erythema dose (MED) was judged visually 24 h after irradiation, and in those patients who were tested at two body sites, objective measurement of the erythema was made using a reflectance instrument. The MED values on the arm showed a fivefold range. There was no significant association between skin type and MED. The MED values on the arm were significantly higher than those measured on the back, although the differences were small in the majority of cases. No significant difference was found between the slopes of the dose-response curves measured on the arm and on the back.
描述了一种在窄带光疗前对患者进行光测试的装置。对150名皮肤类型为I-IV的患者（130例银屑病患者和20例湿疹患者）在前臂进行了光测试，22例患者在前臂和背部都进行了测试。照射后24小时通过肉眼判断最小红斑量（MED），对于在两个身体部位进行测试的患者，使用反射仪对红斑进行客观测量。手臂上的MED值范围为五倍。皮肤类型与MED之间无显著关联。手臂上的MED值显著高于背部测量的值，尽管在大多数情况下差异较小。在手臂和背部测量的剂量反应曲线斜率之间未发现显著差异。
