0674 The role of PTSD symptoms in the relationship between sleep quality and pain following Moderate-to-Severe Traumatic Brain Injury

Abstract Introduction Poor sleep quality and chronic pain are common after moderate-to-severe traumatic brain injury (msTBI). Prior studies have not examined the role of PTSD symptoms in the relationship between sleep quality and chronic pain experience (i.e., severity and pain-related interference) in those with msTBI. Yet, PTSD is known to be associated with both sleep and pain. The purpose of this analysis is to determine the role of PTSD symptoms in the sleep-pain relationship among this at-risk clinical population. Methods Secondary analyses were performed on data (n=1537) from the TBI Model Systems follow-up study. Participants were an average age of 46.21 years old, predominantly male (72.61%), and followed at an average of 8.5 years post injury. Participants completed measures of sleep quality (Pittsburgh Sleep Quality Index; PSQI), pain severity and interference (Brief Pain Inventory; BPI), depression (Patient Health Questionnaire-9; PHQ-9) and PTSD symptoms (PTSD Checklist, PCL-5). Analysis of covariance (ANCOVA) was used to examine differences in pain outcomes controlling for relevant covariates, adjusting for item redundancy prior to analyses. Results Sleep quality and pain interference are associated such that “good sleepers” (PSQI≤8, mean=4.92±2.17) have lower pain interference scores than “poor sleepers” (PSQI>8, mean=12.63±2.87), with a mean pain interference of 3.41±2.32 vs 5.26±2.45 (p< 0.0001). “Good sleepers” also had lower pain severity (4.22±1.78 vs 5.28±1.84, p< 0.0001), lower PTSD symptoms (14.62±13.46 vs 28.35±17.82, p< 0.0001), and less depression symptoms (5.32±4.97 vs 10.57±6.22, p< 0.0001) when compared to “poor sleepers.” Pain interference and severity were significantly related to all covariates at a <.001 level. Further, a significant effect of PSQI score cut-off (“good” v “poor sleeper”) in both pain interference and severity remained after controlling for the effect of age, depression, and PTSD symptom scores. Conclusion In patients with msTBI, sleep quality and pain interference are positively associated such that better sleep quality corresponds with lower pain interference, a relationship which remains when controlling for PTSD and multiple covariates. Addressing the sleep needs of patients with msTBI through behavioral intervention (e.g., cognitive behavioral therapy for insomnia), even in the presence of additional psychiatric comorbidities, may assist those who experience chronic pain following injury. Support (if any)