Mindfulness-based Intervention to Address PTSD in Trauma-exposed, Homeless Women

Posttraumatic stress disorder (PTSD) is a major public health concern that disproportionately effects minorities and those with low-socioeconomic status, such as homeless women, creating a critical health disparity. PTSD has been linked with dysregulated hypothalamic-pituitary-adrenal (HPA) functioning and increased inflammation, which can lead to long-term physical-health problems and PTSD-symptom maintenance, exacerbating disparities. Mindfulness-based interventions, including Mindfulness-based Stress Reduction (MBSR), have shown promise as a complementary tool for addressing PTSD in veterans and with low-income, minority populations, but homeless women have not been examined adequately. MBSR may improve PTSD symptomatology and help modulate the dysregulated stress response common in individuals with PTSD, improving physical and mental health concurrently. This project is an open-label, parallel, modified-cross over clinical trial of a modified-MBSR intervention to reduce PTSD symptoms in homeless women and to explore physiological correlates of treatment-response.

Hypotheses:

1. Participation in an MBSR-based intervention will be associated with clinically significant reduction in PTSD (primary outcome), lower depression symptoms and greater drug and alcohol abstinence (secondary outcomes) compared to participation in an attention control.
2. Compared to an attention control, participants in an MBSR-based intervention group will demonstrate improvements in cortisol reactivity and lower inflammation.

At baseline, women will complete psychosocial assessments (e.g., depression, substance use, trauma history) and participate in a brief stress task, providing salivary samples before and after the task (which will be assayed for cortisol and C-reactive protein, a marker of inflammation). Women will then participate in 1) a 9-session MBSR-based program that was modified based on an initial qualitative component that involved a Community Advisory Board and focus groups with women from the community (N=4 focus groups; 28 women total) or 2) a nine-session health-promotion course (i.e., attention-control condition). Follow-up assessments that include psychosocial and biological data will occur immediately after final intervention session and again 6-months later. Clinically-meaningful improvements in PTSD (primary outcome) and secondary outcomes (e.g., depression, substance use, inflammation, cortisol reactivity) will be examined.