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Neurological Sciences

, Volume 37, Issue 2, pp 253–259 | Cite as

Repeated sessions of transcranial direct current stimulation for treatment of chronic subjective tinnitus: a pilot randomized controlled trial

  • Bijan Forogh
  • Zohre Mirshaki
  • Gholam Reza Raissi
  • Ali Shirazi
  • Korosh Mansoori
  • Tannaz Ahadi
Original Article

Abstract

Subjective tinnitus is an auditory phantom sensation characterized by the perception of sound in the absence of an identifiable external source. This distressing audiological symptom can severely affect the quality of life. Transcranial direct current stimulation (tDCS) is a noninvasive technique that can induce short-term relief in tinnitus in some patients. The purpose of this pilot double-blind randomized controlled trial was to investigate whether repeated application of anodal tDCS over left temporoparietal area could induce long-lasting relief in patients with chronic tinnitus. Twenty-two patients with chronic tinnitus for at least 6 months were randomly allocated into two groups and received five sessions of anodal (N = 11) or sham (N = 11) stimulation in five consecutive days. A current intensity of 2 mA for 20 min was used for anodal stimulation. Outcomes were assessed using Persian version of tinnitus handicap inventory (THI), loudness and distress visual analog scale (VAS) scores and clinical global impression (CGI) scale. The trial is registered at the Iranian Registry of Clinical Trials (IRCT) with the reference ID of IRCT2014082018871N1. No statistically significant difference was found between anodal and sham stimulation regarding either immediate or long-lasting effects over the 2 weeks follow-up period. Deterioration of symptoms and alteration in tinnitus characteristics were reported by a few patients. There were no significant long-term beneficial effects following tDCS of the left temporoparietal area.

Keywords

Tinnitus Treatment Transcranial direct current stimulation tDCS Temporoparietal area Neuromodulation 

Notes

Acknowledgments

We are grateful to patients who participated in this project and Pouria Ghaboussi, MD for his help in rating outcomes.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag Italia 2015

Authors and Affiliations

  • Bijan Forogh
    • 1
  • Zohre Mirshaki
    • 2
  • Gholam Reza Raissi
    • 1
  • Ali Shirazi
    • 3
  • Korosh Mansoori
    • 1
  • Tannaz Ahadi
    • 1
  1. 1.Department of Physical Medicine and RehabilitationFiroozgar Hospital, Iran University of Medical SciencesTehranIran
  2. 2.Physical Medicine and Rehabilitation Specialist at Iran University of Medical SciencesFiroozgar HospitalTehranIran
  3. 3.Department of OtolaryngologyFiroozgar HospitalTehranIran

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