Quality of life and well-being from the perspective of patients on opioid agonist maintenance treatment: study protocol for a systematic review of qualitative research and a scoping review of measures.

Background: Opioid agonist maintenance treatment (OAMT) is a first-line treatment for heroin dependence, but its effectiveness has been assessed primarily through clinical outcomes with a limited attention to patient perspectives. Despite the increased use of patient reported outcome measures their patient-centeredness is highly questionable. This is the protocol of a systematic review of qualitative research on how OAMT users construct the meaning of their quality of life and well-being and a scoping review of instruments that measure these domains.

Methods: We will conduct a systematic review of qualitative research exploring the views of quality of life of patients on OAMT (registration number CRD42018086490). According pre-specified eligibility criteria, we will include studies from a comprehensive search of bibliographical databases from their inception. We will extract data from included studies and assess their risk of bias with the CASP appraisal criteria, and will implement a thematic analysis to generate a set of interpretative analytical themes ascertaining their confidence using the CERQual approach. We will implement similar methods to conduct a scoping review to assess to what extent the existing measures of these domains were focused on user's views, assessing their validity using the COSMIN methodology, and summarizing their characteristics and level of patient centeredness.

Conclusion: The findings from the reviews will contribute to obtain a genuine understanding of the perspective from users on OAMT regarding their perception of well-being and quality of life and will likely lead to greater patient centeredness when assessing such variables, which in turn may contribute to a more patient-centered care.