Home-based transcranial direct current stimulation (tDCS) for bipolar depression: effects on quality of life and...

Individuals with bipolar disorder often experience reduced quality of life (QoL). Transcranial direct current stimulation (tDCS) is a promising non-invasive treatment for bipolar depression that is portable, safe, and suitable for use at home. We developed a home-based tDCS protocol with real-time remote supervision and examined its effect on QoL in bipolar depression.

In an open-label design, 44 participants (31 women) with bipolar depression of at least a moderate severity received 21 sessions of home-based tDCS (2 mA, 30 min, F3 anode/F4 cathode) over 6 weeks, with a follow-up visit conducted 5 months from baseline. QoL was assessed using the quality of life enjoyment and satisfaction questionnaire (Q-LES-Q) at baseline, week 2, end of treatment, and follow-up session. Baseline and post treatment scores were compared with healthy control participants (28 adults; 17 women).

At baseline and at the end of treatment, bipolar participants showed a significantly lower Q-LES-Q score than healthy controls (p < 0.001). Within the bipolar group, there was a significant improvement in total Q-LES-Q scores (p < 0.001) and across multiple domains by week 6 and remained elevated at follow-up. Changes in Q-LES-Q were no longer significant after adjustment for depressive symptoms.

A 6-week course of supervised home-based tDCS was associated with significant QoL improvements in bipolar depression, which appeared to be closely linked to reduction in depressive symptoms. Randomized, sham-controlled trials are warranted to clarify the specific contribution of tDCS to improve QoL in bipolar depression.