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Neuroprogression as an Illness Trajectory in Bipolar Disorder: A Selective Review of the Current Literature

Journal

BRAIN SCIENCES
Volume 11, Issue 2, Pages -

Publisher

MDPI
DOI: 10.3390/brainsci11020276

Keywords

bipolar disorder; illness trajectory; neuroprogression; illness course; illness outcome

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There is a link between bipolar disorder and neurodegeneration, especially in a subgroup of patients. Existing evidence demonstrates that neuroprogression has significant effects on the course and outcome of bipolar disorder. However, the understanding of these impacts is still limited at present.
Bipolar disorder (BD) is a chronic and disabling psychiatric condition that is linked to significant disability and psychosocial impairment. Although current neuropsychological, molecular, and neuroimaging evidence support the existence of neuroprogression and its effects on the course and outcome of this condition, whether and to what extent neuroprogressive changes may impact the illness trajectory is still poorly understood. Thus, this selective review was aimed toward comprehensively and critically investigating the link between BD and neurodegeneration based on the currently available evidence. According to the most relevant findings of the present review, most of the existing neuropsychological, neuroimaging, and molecular evidence demonstrates the existence of neuroprogression, at least in a subgroup of BD patients. These studies mainly focused on the most relevant effects of neuroprogression on the course and outcome of BD. The main implications of this assumption are discussed in light of specific shortcomings/limitations, such as the inability to carry out a meta-analysis, the inclusion of studies with small sample sizes, retrospective study designs, and different longitudinal investigations at various time points.

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