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Abstract
The efficacy of transcranial magnetic stimulation (TMS) has been poorly investigated in the acute and maintenance treatment of bipolar depression. The present case supports the efficacy of low-frequency repetitive TMS (rTMS) of the right dorsolateral pre-frontal cortex (RDLPFC) combined to brain navigation in a drug-resistant, bipolar depressed subject with rapid cycling. While continuing the pharmacological treatment at stable doses, the patient was stimulated for 3 weeks at 1 Hz, 110% of motor threshold, 300 stimuli/day showing a significant improvement on the Hamilton Depression Rating Scale (HDRS21), the Montgomery–Asberg Depression Rating Scale (MADRS) and the Clinical Global Impression, improvement scale (CGI-I) total scores. On completion of the 3-week rTMS, the patient was treated with periodic maintenance sessions of rTMS at the same parameters of acute phase for an additional 6 months, at the end of which the therapeutic gains were maintained according to rating scales scores. Larger controlled trials assessing the acute and maintenance efficacy of rTMS in bipolar depression are needed.