3.1
NICE did a rapid review of the published literature on the efficacy and safety of this procedure. This comprised a comprehensive literature search and detailed review of the evidence from 12 sources, which was discussed by the committee. The evidence included 2 randomised controlled trials (both of which are also included in at least 1 of the meta-analyses), 2 meta-analyses, 2 systematic reviews (most of the patients who had deep brain stimulation in these reviews are also included in the meta-analyses), 1 non-randomised comparative study, 4 case series and 1 case report. It is presented in table 2 in the interventional procedures overview. Other relevant literature is in the appendix of the overview.