Insomnia in a chronic musculoskeletal pain with disability population is independent of pain and depression

Abstract

BACKGROUND CONTEXT Insomnia is frequently experienced by patients suffering from chronic musculoskeletal disorders, but is often seen as simply a symptom of pain or depression, and not as an independent disorder. Compared to those who experience only chronic pain, patients with both chronic pain and insomnia report higher pain intensity, more depressive symptoms, and greater distress. However, insomnia has not yet been systematically studied in a chronic musculoskeletal pain with disability population. PURPOSES This study assessed the prevalence and severity of patient-reported insomnia, as well as the relationship among insomnia, pain intensity, and depressive symptoms, in a chronic musculoskeletal pain with disability population. STUDY DESIGN/SETTING A retrospective study of prospectively captured data. PATIENT SAMPLE A consecutive cohort of 326 chronic musculoskeletal pain with disability patients (85% with spinal injuries) entered a functional restoration treatment program. All patients signed a consent form to participate in this protocol. OUTCOME MEASURES Insomnia was assessed with the Insomnia Severity Index (ISI), a validated patient-report measure of insomnia symptoms. Four patient groups were formed: No Clinically Significant Insomnia (score 0–7); Sub-Threshold Insomnia (score 8–14); Moderate Clinical Insomnia (score 15–21); and Severe Clinical Insomnia (score 22–28). Three patterns of sleep disturbance were also evaluated: Early, Middle, and Late Insomnia. Additional validated psychosocial patient-report data were collected, including the Pain Visual Analog Scale (PVAS), the Beck Depression Inventory (BDI), and the Pain Disability Questionnaire (PDQ). METHODS Patients completed a standard psychosocial assessment battery upon admission to the functional restoration program. The program included a quantitatively-directed exercise process in conjunction with a multimodal disability management approach. The four insomnia groups were compared on demographic and psychosocial variables. The shared variances among insomnia, depression, and pain were determined by partial correlational analyses. The writing of this article was supported in part by Grant 1K05 MH 71892 from NIH, focusing on evidence-based assessment and treatment approaches to musculoskeletal pain and the monitoring of valid outcomes. None of the authors involved in this study had a conflict of interest. RESULTS The presence of No Clinically Significant Insomnia, Sub-threshold Insomnia, Moderate Clinical Insomnia and Severe Clinical Insomnia was found in 5.5%, 21.2%, 39.6%, and 33.7% of the cohort, respectively. More than 70% of patients reported moderate to severe insomnia symptoms, which is a considerably higher prevalence than found in most patient cohorts studied previously. A step-wise pattern was found, in which Severe Clinical Insomnia patients reported the highest pain, the most severe depressive symptoms, and the greatest disability. The Severe Clinical Insomnia patients also reported a higher number of sleep disturbance ty...

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