“…The most frequently reported were: to assess/monitor sedation depth after palliative sedation initiation ( n = 29), to assess effects or side effects of opioid use ( n = 7), 29,34,45,54,56,81,91 to evaluate signs/symptoms of impending death ( n = 8) 21–23,37,42,60,61,79 and to examine associations between level of consciousness and discomfort or other symptoms ( n = 6). 40,44,50,60,61,64 It is noteworthy that only four studies sought to validate level of consciousness instruments in the palliative care setting. 18,73,87,93 Of these, only one aimed to develop a new tool.…”