Palliative Care Interventions Effects on Psychological Distress: A Systematic Review & Meta-Analysis.

Background: Managing psychological distress is an objective of palliative care. No meta-analysis has evaluated whether palliative care reduces psychological distress.

Objectives: Examine the effects of palliative care on depression, anxiety, and general psychological distress for adults with life-limiting illnesses and their caregivers.

Design: We searched PubMed, PsycInfo, Embase, and CINAHL for randomized clinical trials (RCTs) of palliative care interventions. RCTs were included if they enrolled adults with life-limiting illnesses or their caregivers, reported data on psychological distress at 3 months after study intake, and if authors had described the intervention as "palliative care."

Results: We identified 38 RCTs meeting our inclusion criteria. Many (14/38) included studies excluded participants with common mental health conditions. There were no statistically significant improvements in patient or caregiver anxiety (patient SMD: -0.008, P = 0.96; caregiver SMD: -0.21, P = 0.79), depression (patient SMD: -0.13, P = 0.25; caregiver SMD -0.27, P = 0.08), or psychological distress (patient SMD: 0.26, P = 0.59; caregiver SMD: 0.04, P = 0.78).

Conclusions: Psychological distress is not likely to be reduced in the context of a typical palliative care intervention. The systemic exclusion of patients with common mental health conditions in more than 1/3 of the studies raises ethical questions about the goals of palliative care RCTS and could perpetuate inequalities.