Associations among Sleep Disturbance, Pain Catastrophizing, and Pain Intensity for Methadone-maintained Patients with Opioid Use Disorder and Chronic Pain.

OBJECTIVE This study examined the cross-sectional associations among pain intensity, pain catastrophizing, and sleep disturbance among patients receiving methadone maintenance treatment (MMT) for opioid use disorder (OUD) and reporting co-occurring chronic pain. METHODS Participants were 89 patients with OUD and chronic pain drawn from a larger cross-sectional study of 164 MMT patients who completed a battery of self-report measures. We conducted six mediation models to test all possible pathways (i.e., each variable tested as an independent variable, mediator, or dependent variable). RESULTS The only significant mediation effect was an indirect effect of sleep disturbance on pain intensity via pain catastrophizing. That is, greater sleep disturbance was associated with greater pain catastrophizing, which in turn was associated with greater pain intensity. DISCUSSION Altogether, findings suggest that the sleep disturbance to pain catastrophizing to pain intensity pathway may be a key mechanistic pathway exacerbating pain issues among MMT patients with OUD and chronic pain. These results suggest that interventions targeting sleep disturbance may be warranted among MMT patients with OUD and chronic pain. Future work in this area with longitudinal data is warranted.