01-08-2016
rTMS for the Treatment of Depression: a Comprehensive Review of Effective Protocols on Right DLPFC
Published in: International Journal of Mental Health and Addiction | Issue 4/2016
Login to get accessAbstract
Major depressive disorders (MDDs) are the most common and debilitating diseases worldwide. Repetitive transcranial magnetic stimulation (rTMS) has been widely used as an alternative or adjunctive treatment for different types of depression disorders, including drug-resistant major depressions. Despite controversial findings on the therapeutic outcomes of this technique, the general consent is developing this technique as an alternative treatment for depression disorders. Notwithstanding one protocol of rTMS has been approved by FDA for the acute treatment of major depression, studies are ongoing for finding more efficient protocols. This study aimed to comprehensively overview the effective rTMS protocols applied on left dorsolateral prefrontal cortex DLPFC for MDDs. The databases of PubMed (1985–2015), Web of Sciences (1985–2015), and Google Scholar (1980–2015) were searched using the set terms. The obtained results were screened for the relevant contents by two authors, and the appropriate studies were selected for further review. The most widely used protocols for depression are 1Hz for right and 10Hz for left DLPFC. In addition, the main parameters of these protocols and the main neurophysiological mechanisms of two common frequencies of 1 and 10 Hz are summarized. Different protocols of rTMS, particularly low versus high frequencies, result in significantly different electrophysiological and neurocognitive changes in the subject. Low frequency rTMS modulates frontal alpha power asymmetry and high frequency protocols influence more broader regions and wider electrophysiological characteristics of the brain.