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Development of the PHASE-Proxy scale for rating drug-related signs and symptoms in severe cognitive impairment
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Public Health and Caring Sciences, Caring Sciences. (vårdvetenskap)ORCID iD: 0000-0001-6296-0160
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Public Health and Caring Sciences, Caring Sciences. Högskolan i Gävle, Avdelningen för hälso- och vårdvetenskap..
Uppsala Univ Hosp, Dept Medicat & Patient Safety, Uppsala, Sweden.
Department of medication and patient safety, Uppsala University Hospital, Uppsala.
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2018 (English)In: Aging & Mental Health, ISSN 1360-7863, E-ISSN 1364-6915, Vol. 22, no 1, p. 53-60Article in journal (Refereed) Published
Abstract [en]

OBJECTIVES: The need for assessment of possible drug-related signs and symptoms in older people with severe cognitive impairment has increased. In 2009, the PHASE-20 rating scale for identifying symptoms possibly related to medication was the first such scale to be found valid and reliable for use with elderly people. In this project, the aim was to develop and examine the psychometric properties and clinical utility of PHASE-Proxy, a similar scale for proxy use in assessing elderly people with cognitive impairment.

METHODS: Three expert groups revised PHASE-20 into a preliminary proxy version, which was then tested for inter-rater reliability, internal consistency, and content validity. Its clinical usefulness was investigated by pharmacist-led medication reviews. Group interviews and a study-specific questionnaire with nursing home staff were used to investigate the feasibility of use.

RESULTS: The PHASE-Proxy scale had satisfactory levels of inter-rater reliability (Spearman's rank correlation coefficient; rs = 0.8), and acceptable internal consistency (Cronbach's alpha coefficient; α = 0.73). The factor analysis resulted in a logical solution with seven factors, grouped into two dimensions: signs of emotional distress and signs of physical discomfort. The medication reviews, interviews, and questionnaires also found the proxy scale to be clinically useful, and feasible to use.

CONCLUSION: The PHASE-Proxy scale appears to be a valid instrument that enables proxies to reliably assess nursing home residents who cannot participate in the assessment, to identify possible drug-related signs and symptoms. It also appears to be clinically useful and feasible for use in this population.

Place, publisher, year, edition, pages
2018. Vol. 22, no 1, p. 53-60
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:uu:diva-303839DOI: 10.1080/13607863.2016.1232364ISI: 000417735800008PubMedID: 27657536OAI: oai:DiVA.org:uu-303839DiVA, id: diva2:974158
Funder
Swedish National Board of Health and Welfare, 6.2.4-42858/2011Available from: 2016-09-25 Created: 2016-09-25 Last updated: 2018-01-17Bibliographically approved

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