The Assessment of Cognitive Dysfunction in Major Depressive Disorder: A 16-Week Prospective Case-Control Study

Area of Science:

• Neuroscience
• Psychiatry
• Clinical Psychology

Background:

• Cognitive dysfunction is a core feature of major depressive disorder (MDD).
• Two-thirds of MDD patients experience cognitive deficits impacting daily functioning.
• Understanding cognitive changes during MDD treatment is crucial.

Purpose of the Study:

• To assess changes in mood and cognitive symptoms in MDD patients over 16 weeks of treatment.
• To compare cognitive performance between MDD patients and healthy controls (HCs).

Main Methods:

• A 16-week prospective case-control study involving 98 MDD patients and 113 HCs.
• Mood symptoms assessed using the Montgomery-Asberg Depression Rating Scale.
• Cognitive function evaluated with the Perceived Deficits Questionnaire-Depression and Digit Symbol Substitution Test.

Main Results:

• MDD patients exhibited worse neurocognitive function at baseline compared to HCs.
• Cognitive functions improved significantly from week 8 to week 16 in MDD patients.
• Despite improvements and achieving remission, cognitive performance in MDD patients did not reach HC levels by week 16.

Conclusions:

• Cognitive deficits in MDD persist even after mood symptoms improve and remission is achieved.
• Longitudinal research indicates enduring cognitive impairment in treated MDD patients.
• Further research is needed to address persistent cognitive dysfunction in MDD.