Changes in sleep quality, but not hormones predict time to postpartum depression recurrence

Abstract

Abstract Background Poor sleep quality, dysregulation of hormones and increased inflammatory cytokines are all associated with the risk for postpartum major depression (PPMD). We evaluated change over time in sleep quality and hormones during the first 17 weeks postpartum, as well as a single cytokine measure, and their association with PPMD recurrence. Methods Participants were pregnant women (N = 56), with past histories of MDD/PPMD but not depressed in their current pregnancy. The Pittsburgh Sleep Quality Index (PSQI) and blood samples were collected 8 times during the first 17 weeks postpartum. Estradiol, prolactin and cortisol, and a single measure of IL-6 were assayed. Recurrence was determined by two consecutive 21-item Hamilton Rating Scale for Depression (HRSD) scores ≥ 15 and clinician interview. Results In the analyses of time to PPMD recurrence, poor sleep quality, but none of the hormones, was associated with PPMD recurrence (p 2 = 0.98, p = .32). Conclusions Poor sleep quality across the first 17 weeks post-delivery increases the risk for recurrent PPMD among women with a history of MDD. Changes in the hormonal milieu were not associated with recurrence. Further exploration of the degree to which poor sleep contributes to hormonal and cytokine dysregulation and how they are involved in the pathophysiology of PPMD is warranted.