循证医学证据检索_培训课件.ppt

要检索哪些循证医学资源 循证医学数据库 BMJ Clinical Evidence Uptodate Pier Cochrane Library 循证医学搜索 循证医学期刊 Background Around 1% of the worlds population has vitiligo, which causes a loss of skin colour in patches. The methods currently available to treat vitiligo are largely unsatisfactory and vary widely between cultures and within health systems.Objectives To assess the effects of interventions used to manage vitiligo.Search strategy We searched the Cochrane Skin Group Specialised Register, the Cochrane Central Register of Controlled Trials, MEDLINE, EMBASE, AMED and other databases (last searched September 2004). Reference lists of articles and conference proceedings were searched. Authors of reviews were contacted.Selection criteria Randomised controlled trials (RCTs).Data collection and analysis At least two reviewers independently assessed study eligibility and methodological quality and carried out data extraction. The included studies compared different interventions and used different outcome measures so we considered it inappropriate to combine their results. Abstract Main results Nineteen trials with a total of 1350 participants were included. The RCTs generally had low numbers of participants and only RCTs of repigmentation and not other methods of managing vitiligo were able to be included.In one study, potent topical steroids resulted in better repigmentation than placebo and they were also better than oral psoralens plus sunlight in another study (RR 4.70 95% CI 1.14 to 19.39) although their long-term use is limited by adverse effects. Two studies suggested that topical calcipotriol enhanced repigmentation rates from PUVAsol and PUVA when compared with placebo. Another two studies showed higher repigmentation rates with oral PUVAsol versus placebo plus sunlight (RR 19.20 95% CI 1.21 to 304.50 in 79 adults and RR 2.29 95% CI 1.14 to 4.58 in a study of 50 children). The safety of these interventions was poorly described and none of the studies was able to dem