RESUMEN
BACKGROUND: A previous systematic review reporting the contributions of informal, unpaid caregivers to patient heart failure (HF) self-care requires updating to better inform research, practice, and policy. OBJECTIVE: The aim of this study was to provide an updated review answering the questions: (1) What specific activities do informal caregivers of adults with HF take part in related to HF self-care? (2) Have the activities that informal caregivers of adults with HF take part in related to HF self-care changed over time? (3) What are the gaps in the science? METHODS: This review followed Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. PubMed, CINAHL, EMBASE, and Cochrane CENTRAL databases were searched. Eligible studies involved an informal, unpaid caregiver of an adult with HF as a study variable or participant. Caregiving activities were benchmarked using the theory of self-care in chronic illness. RESULTS: Two thousand one hundred fifty-four research reports were identified, of which 64 met criteria. Caregivers' contributions occurred in self-care maintenance (91%), monitoring (54%), and management (46%). Activities performed directly on or to the patient were reported more frequently than activities performed for the patient. Change over time involved the 3 domains differentially. Gaps include ambiguous self-care activity descriptions, inadequate caregiving time quantification, and underrepresented self-care monitoring, supportive, and communication activities. CONCLUSIONS: Newly identified caregiver-reported activities support updating the theory of self-care in chronic illness to include activities currently considered ancillary to HF self-care. Identified gaps highlight the need to define specific caregiving activities, determine task difficulty and burden, and identify caregiver self-care strategy and education needs. Exposing the hidden work of caregiving is essential to inform policy and practice.
RESUMEN
Ageing and chronic stress have been linked to reduced telomere length (TL) in mixed-age groups. Whether stress response components are linked to TL during the midlife-to-late adulthood transition remains unclear. Our study aimed to synthesise evidence on the relationship between psychological and biological components of stress response on TL in middle-aged and older adults. We conducted a systematic review of studies obtained from six databases (PubMed, CINAHL, EMBASE, PsycINFO, Web of Science, and Scopus) and evaluated by two independent reviewers. Original research measuring psychological and biological components of stress response and TL in human individuals were included. From an initial pool of 614 studies, 15 were included (n = 9446 participants). Synthesis of evidence showed that higher psychological components of the stress response (i.e., global perceived stress or within a specific life domain and cognitive appraisal to social-evaluative stressors) were linked to shorter TL, specifically in women or under major life stressors. For the biological stress response, cortisol, dehydroepiandrosterone sulphate and IGF-1/cortisol imbalance, IL-6, MCP-1, blood pressure, and heart rate presented a significant association with TL, but this relationship depended on major life stressors and the stress context (manipulated vs. non-manipulated conditions). This comprehensive review showed that psychological and biological components of the stress response are linked to shorter TL, but mainly in women or those under a major life stressor and stress-induced conditions. The interaction between stressor attributes and psychological and biological reactions in the transition from middle to late adulthood still needs to be fully understood, and examining it is a critical step to expanding our understanding of stress's impact on ageing trajectories.