Grief, bereavement and prolonged grief disorder: scoping and mapping the evidence

Some individuals experience abnormally persistent and intense symptoms of grief that significantly interfere with daily functioning. This condition has been described using terms such as complicated or prolonged grief and prolonged grief disorder (PGD).

To identify the availability of evidence addressing a range of policy relevant issues related to grief, bereavement and PGD. In this paper we focus on the availability of evidence from systematic reviews.

We searched 12 databases and the websites of 18 grief- or bereavement-related organisations. Using key characteristics extracted from included reviews, we produced a high-level overview of the available evidence that enabled potential research gaps to be identified.

We identified 212 reviews - 103 focused on people's experiences of grief/bereavement including service use; 22 reported on PGD prevalence, 42 on PGD risk factors, 37 on factors that influence grief more broadly and 80 on the effectiveness of grief-related interventions. Fifty-five reviews focused on multiple issues of interest. Half of reviews focused on a specific cause/type of death (n = 108). Of these reviews, most focused on three main causes/types of death: a specific health condition or terminal illness (n = 36), perinatal loss (n = 34) and suicide (n = 20).

We identified a large number of reviews, but key evidence gaps exist, particularly in relation to intervention cost-effectiveness and social, organisational or structural-level interventions that are needed for addressing inequities and other modifiable factors that can impair grieving and potentially increase the risk of PGD.