Recent studies have focussed on detecting white matter abnormalities in subjects who transition to psychosis (UHR-T). Research suggests that fractional anisotropy (FA), may be decreased in UHR-T. However, global and regional findings have been inconsistent. By objectively combining data in a meta-analysis, we have investigated white matter alterations associated with transition, by comparing FA in UHR-T with subjects that do not transition (UHR-NT) and healthy volunteers.

The meta-analysis was registered on PROSPERO (ID: CRD42021265348) and followed Preferred Reporting Items for Systematic Reviews and Meta-Analyses PRISMA guidance. A systematic database search of PUBMED and EMBASE identified reports, which were screened by 2 independent researchers (CN and DD) for inclusion, from inception to 20 July 2021. Discrepancies were decided on consensus with a third researcher (KM). Reference lists of eligible studies were also screened. Authors of screened reports were contacted to provide parametric maps. Coordinate-based meta-analysis was conducted using Seed-based d-Mapping software to combine parametric map and coordinate data from reports, using a random-effects model. Quality and risk of bias analysis were conducted using the Newcastle-Ottowa Scale. Heterogeneity and sensitivity analyses were also conducted.

The search strategy identified 889 potential studies, from which 6 met eligibility criteria. A total of 71 UHR-T, 142 UHR-NT and 148 healthy volunteers were included. Weighted-mean decreases in FA were observed in UHR-T compared with: UHR-NT (d = −0.99; p < 0.0001; 95% CI −1.43 to −0.55); and healthy volunteers (d = −0.91; p = 0.04; 95% CI −1.78 to −0.05). The level of heterogeneity for the former was not significant. For UHR-T, regional FA decreases were observed in areas including the left genu of the corpus callosum (Z-score = −1.76, 204 voxels, p < 0.0001) compared with UHR-NT, while FA increases were most observed in the white matter region adjacent to the left postcentral gyrus (Z-score = 1.64, voxels = 16, p < 0.0001). These findings persisted despite sensitivity analyses.

The findings suggest that white matter alterations, specifically in left frontotemporal tracts, are associated with an increased risk of transition to psychosis. The neurobiological implications of these findings, and their contribution to UHR-T prediction efforts, are explored, as are avenues for further research.

Additional Author: Mr Gunnar Gronlid.1

Unique challenges have been faced by women in the perinatal period during the COVID-19 pandemic and the impact of this is compounded for women suffering from mental illness. This service evaluation looked at different aspects of the treatment pathway on a specialist inpatient psychiatric Mother and Baby Unit during the pandemic to identify what changes occurred.

Data were collected for all admissions to the unit between January 2019 and October 2020, with the beginning of the pandemic being defined as on or after 1st March 2020. Information was collected retrospectively from electronic clinical notes on ethnicity, length of stay, diagnosis, mental health act use and restrictive practice, medication, psychology, occupational therapy and social services involvement.

There were 114 admissions to the MBU during the study period. 4 were parenting assessments rather than acute psychiatric admissions and were excluded from the analysis, giving a sample of 110 women. 58% (62/110) were classed as “pre-pandemic” and 43.6% (48/110) were “during pandemic”. 95.45% (105/110) of women were postpartum 4.55% (5/110) were pregnant. Mean length of stay was shorter during the pandemic at 44 days, compared to 61 pre-pandemic. There was greater use of the mental health act during the pandemic: only 43.75% of patients were informal throughout admission, compared to 70.97% pre-pandemic. Mean duration of detention was shorter at 25 days (32 pre-pandemic). Psychotic illness made up a greater proportion of diagnoses during the pandemic: 56% (27/48) compared to 44% (27/62) pre-pandemic. The next most common diagnostic group was mood and anxiety disorders, which made up 29% (14/48) of diagnoses during the pandemic, but 43% (27/62) pre-pandemic. Outcomes as measured using the Health of the Nation Outcome Scale showed a mean improvement between admission and discharge of 6.65, compared to 5.15 pre-pandemic. HONOS scores were higher on admission during the pandemic (12.83, vs 10.88), suggesting a higher level of acuity.

During the COVID-19 pandemic on this Mother and Baby Unit, length of stay was shorter, a greater proportion of patients were detained under the mental health act (although length of detention was shorter) and psychotic illness was more prevalent. This study demonstrates that there were differences in this perinatal inpatient population during the pandemic and this may be a reflection on the wider impact of COVID-19 on perinatal mental health.