4.7 Article

Resting-state functional connectivity correlates of anxiety co-morbidity in major depressive disorder

Journal

NEUROSCIENCE AND BIOBEHAVIORAL REVIEWS
Volume 138, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neubiorev.2022.104701

Keywords

FMRI; Functional magnetic resonance imaging; Neuroimaging; Functional connectivity; Effective connectivity; Treatment personalisation; Anxiety; Depression; Co-morbidity

Funding

  1. UK National Institute for Health and Care Research (NIHR) [ACF-2019-12-007]
  2. NIHR Efficacy and Mechanism Evaluation grant [16/44/22]
  3. Nottingham NIHR Biomedical Research Centre
  4. NIHR MindTech Med Tech and in Vitro Centre
  5. NIHR Applied Research Centre East Midlands
  6. National Institutes of Health Research (NIHR) [16/44/22] Funding Source: National Institutes of Health Research (NIHR)

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This systematic review explores the differences in resting-state brain connectivity associated with comorbid anxiety in individuals with MDD. The findings suggest that dysconnectivity between the amygdala and other brain networks, as well as abnormalities in default mode network connectivity, may play a role in the co-occurrence of anxiety and MDD.
Major depressive disorder (MDD) is frequently co-morbid with anxiety disorders. The co-morbid state has poorer functional outcomes and greater resistance to first line treatments, highlighting the need for novel treatment targets. This systematic review examined differences in resting-state brain connectivity associated with anxiety comorbidity in young-and middle-aged adults with MDD, with the aim of identifying novel targets for neuromodulation treatments, as these treatments are thought to work partly by altering dysfunctional connectivity pathways. Twenty-one studies met inclusion criteria, including a total of 1292 people with MDD. Only two studies included people with MDD and formally diagnosed co-morbid anxiety disorders; the remainder included people with MDD with dimensional anxiety measurement. The quality of most studies was judged as fair. Results were heterogeneous, partly due to a focus on a small set of connectivity relationships within individual studies. There was evidence for dysconnectivity between the amygdala and other brain networks in co-morbid anxiety, and an indication that abnormalities of default mode network connectivity may play an underappreciated role in this condition.

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