Collaborative care for depression in UK primary care: a randomized controlled trial.

Area of Science:

• Mental Health Research
• Clinical Trial Design
• Primary Care Interventions

Background:

• Collaborative care is an effective depression intervention with organizational and patient-level components.
• Its effectiveness in the UK and optimal trial design (cluster vs. patient randomization) for Phase III trials are unknown.

Purpose of the Study:

• To evaluate the effectiveness of collaborative care for depression in UK primary care.
• To assess the feasibility and inform the design of a Phase III clinical trial.

Main Methods:

• A Phase II patient-level randomized controlled trial nested within a cluster-randomized trial.
• Participants randomized to collaborative care (case manager-coordinated support, psychological treatment, enhanced communication) or usual care.
• Primary outcome: depression symptoms measured by PHQ-9.

Main Results:

• Recruited 114 participants.
• Intervention showed a significant effect size (0.63) compared to cluster control.
• Evidence of contamination between intervention and patient-randomized control groups, with a larger difference observed against the cluster-randomized control group.

Conclusions:

• Collaborative care is a potentially powerful organizational intervention for depression in UK primary care.
• Findings suggest organizational aspects may mediate treatment effects.
• A large Phase III cluster-randomized trial is recommended for accurate testing.