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JOURNAL ARTICLE
MULTICENTER STUDY
Psychomotor retardation is a scar of past depressive episodes, revealed by simple cognitive tests.
European Neuropsychopharmacology : the Journal of the European College of Neuropsychopharmacology 2014 October
The cumulative duration of depressive episodes, and their repetition, has a detrimental effect on depression recurrence rates and the chances of antidepressant response, and even increases the risk of dementia, raising the possibility that depressive episodes could be neurotoxic. Psychomotor retardation could constitute a marker of this negative burden of past depressive episodes, with conflicting findings according to the use of clinical versus cognitive assessments. We assessed the role of the Retardation Depressive Scale (filled in by the clinician) and the time required to perform the neurocognitive d2 attention test and the Trail Making Test (performed by patients) in a sample of 2048 depressed outpatients, before and after 6 to 8 weeks of treatment with agomelatine. From this sample, 1140 patients performed the TMT-A and -B, and 508 performed the d2 test, at baseline and after treatment. At baseline, we found that with more past depressive episodes patients had more severe clinical level of psychomotor retardation, and that they needed more time to perform both d2 and TMT. When the analyses were performed again after treatment, and especially when the analyses were restricted to patients with clinical remission, the cognitive tests were the only ones correlated with past depressive episodes. Psychomotor retardation tested at a cognitive level was therefore systematically revealing the burden of past depressive episodes, with an increased weight for patients with less remaining symptoms. If prospectively confirmed, interventions such as cognitive remediation therapy could benefit from a more specific focus on neurocognitive retardation.
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