Serum albumin and depression in end-stage renal disease.

The purpose of our study was to determine whether albumin influenced patients' depression or whether depression influenced patients' albumin. Patients from a tertiary care university medical hospital were assessed for both serum albumin and depression [Beck Depression Inventory (BDI)] at two time points separated by 6 months. Data were collected for 72 patients (43 male, 29 female; mean age 54 years). The sample consisted of 32 hemodialysis and 40 peritoneal dialysis patients. The outcome measures were changes in depression and albumin over time. Regression analysis indicated that all three Time 1 measures of BDI, BDICOG (BDI cognitive), and BDISOM (BDI somatic) significantly predicted decreases in albumin from Time 1 to Time 2 (beta = -0.22, p < 0.002; beta = -0.17, p < 0.015; beta = -0.23, p < 0.002, respectively). However, Time 1 measures of albumin did not predict changes in BDI, BDICOG, or BDISOM (beta = -0.04, p < 0.738; beta = -0.08, p < 0.375; beta = -0.07, p < 0.618, respectively). Thus depression at Time 1 predicted decreases in albumin from Time 1 to Time 2. The reverse effect that albumin influences depression from Time 1 to Time 2 was not found. In conclusion, this study suggests that depression influences the nutritional status indicated by albumin levels. Thus poor nutritional status may mediate the relation between depression and mortality in end-stage renal disease (ESRD).