Objective: Specialized palliative care (SPC) interventions increasingly include patient-caregiver dyads, but their effects on dyadic coping are unknown. We investigated whether an SPC and dyadic psychological intervention increased aspects of dyadic coping in patients with advanced cancer and their caregivers, whether dyad characteristics moderated effects and whether aspects of dyadic coping mediated significant intervention effects on caregivers' anxiety and depression.
Methods:We randomized 258 patients with incurable cancer and their caregivers to care as usual or accelerated transition from oncological treatment to home-based SPC and dyadic psychological support. In secondary outcome analyses, using mixedeffects models, we estimated intervention effects and 95% confidence intervals (CIs) for communication of stress and common coping, and moderation by dyad type and demographics. In path analyses, we investigated whether stress communication and common coping mediated intervention effects on caregivers' symptoms of anxiety and depression. (Clinicaltrials.gov NCT01885637).
Results:The intervention significantly increased common coping in patients and caregivers in couples (estimated difference, 0.68; 95% CI, 0.11 to 1.24) and stress communication by partner caregivers (0.97; 0.24 to 1.24). We found some support for different intervention effects for spouses and other dyads, but no evidence of mediation.Conclusions: Specialized palliative care and dyadic psychological intervention may affect aspects of dyadic coping. Common coping and stress communication did not mediate the previously found significant intervention effects on caregiver anxiety and depression, indicating that other mechanisms may have been central in the intervention.The stressful life with advanced cancer requires patients and caregivers to cope individually and together. 1,2 Multidisciplinary specialized palliative care (SPC) aims to relieve suffering in patients with life-threatening illness and their families 3 and can significantly improve quality of life of patients with advanced cancer. 4 According to the systemic transactional model of coping (STM), couples may cope with stressors such as cancer in individual and interactional ways. 2,5 Dyadic coping is a reciprocal process in which each partner's communication of stress serves to elicit support from the other partner, like helping with or taking over tasks (supportive/delegated coping), and common coping, ie, managing a problem together. 5 In patients with cancer, stress communication has been related to better dyadic adjustment 6 and quality of life. 7 Greater common coping efforts, such as joint problem-solving or relaxation, have been found to predict increased relationship quality and lower depressive symptoms in dyads coping with cancer 8 but have also been associated with lower distress in caregivers and increased distress in patients. 6 Psychological interventions targeting dyads of patients with advanced cancer and their partners or caregivers may significantly improve, eg, psy...