The demand to document meaningful outcomes is pressuring pain clinics to develop methods to systematically assess the patient's physical, emotional, and social functioning and to include such factors as monitored patient outcomes. To further understand the factors that affect these outcomes, data from 4,113 consecutive pain clinic patients were examined. At a clinic visit, these individuals were administered the SF-36 and a clinical questionnaire. Diagnoses were made by a single pain medicine physician. All patient data were entered into the data registry of the AAPM Uniform Outcomes Measures project and were searched to identify those with low back pain (LBP). LBP patients were further classified according to the presence or absence of a depression diagnosis. The impact of co-morbid depression for patient functioning, as indicated by initial and subsequent SF-36 scores was evaluated. 1,628 individuals had at least one LBP diagnosis. This sample was predominantly female (58%) and middle-aged (mean 55 [SD 15.5]). The most common LBP diagnoses were: radiculopathy (62.2%), disc herniation (17.7%) and spinal stenosis (5.3%) but the sample included the full range of problems causing LBP. 32% of the sample received a diagnosis of depression. While scores for the total LBP group on all eight SF-36 domains were significantly lower (P < .0001) than those of a comparison non-pain patient group, the additional impact of co-morbid depression was striking. Comparison of SF-36 scores indicated LBP patients with a diagnosis of co-morbid depression were 1.7 to 3.2 times more likely than comparable non-depressed LBP patients to be in the worst quartiles of physical and emotional functioning. Moreover, the effects of depression persisted over time. This study demonstrates the feasibility of assessing physical, emotional, and social functioning outcomes in the pain clinic setting. It also provides important evidence supporting the need for the routine evaluation and management of co-morbid depression.
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