Depression Symptoms Associated With Clinical Symptoms, Disability, and Functional Connectivity After Traumatic Brain...

Area of Science:

• Neuroscience
• Psychiatry
• Clinical Psychology

Background:

• Depression is a heterogeneous condition with distinct symptom clusters.
• The nature of depression heterogeneity after traumatic brain injury (TBI) and its correlates remain largely unknown.

Purpose of the Study:

• To investigate depression symptom clusters following subacute TBI.
• To evaluate the clinical, functional, and neural correlates of these depression clusters.

Main Methods:

• Community-dwelling participants (N=53) with complicated mild to severe TBI were assessed approximately 5 months post-injury.
• Standardized scales (HDRS, Rivermead Post-Concussion Symptom Questionnaire, GOS-E) and neuropsychological tests were administered.
• Resting-state functional MRI was conducted on a subset of participants.

Main Results:

• Principal component analysis of the Hamilton Depression Rating Scale (HDRS) identified two symptom clusters.
• Cluster 2 (anxiety, insomnia, somatic symptoms) correlated with higher TBI symptom burden, disability, and poorer executive function.
• Cluster 1 (mood, affect, agitation) showed no significant associations with TBI burden or function, but a trend linked negative affect to altered brain network connectivity.

Conclusions:

• Depression following TBI is likely not a unitary syndrome.
• Distinct symptom clusters have differential associations with TBI burden, functional outcomes, and neurobiological measures.
• These findings highlight the need for tailored approaches to managing depression post-TBI.