Daily high-frequency transcranial random noise stimulation of bilateral temporal cortex in chronic tinnitus - a pilot study

Peter M Kreuzer, Timm B Poeppl, Rainer Rupprecht, Veronika Vielsmeier, Astrid Lehner, Berthold Langguth, Martin Schecklmann, Peter M Kreuzer, Timm B Poeppl, Rainer Rupprecht, Veronika Vielsmeier, Astrid Lehner, Berthold Langguth, Martin Schecklmann

Abstract

Several studies emphasized the potential of single and multiple transcranial random noise stimulation (tRNS) sessions to interfere with auditory cortical activity and to reduce tinnitus loudness. It was the objective of the present study to evaluate the use of high-frequency (hf) tRNS in a one-arm pilot study in patients with chronic tinnitus. Therefore, 30 patients received 10 sessions of high frequency tRNS (100-640 Hz; 2 mA; 20 minutes) over the bilateral temporal cortex. All patients had received rTMS treatment for their tinnitus at least 3 months before tRNS. Primary outcome was treatment response (tinnitus questionnaire reduction of ≥5 points). The trial was registered at clinicaltrials.gov (NCT01965028). Eight patients (27%) responded to tRNS. Exactly the same number of patients had responded before to rTMS, but there were only two "double responders" for both treatments. None of the secondary outcomes (tinnitus numeric rating scales, depressivity, and quality of life) was significant when results were corrected for multiple comparisons. tRNS treatment was accompanied by tolerable side effects but resulted in temporal increases in tinnitus loudness in 20% of the cases (2 drop-outs). Our trial showed that hf-tRNS is feasible for daily treatment in chronic tinnitus. However, summarizing low treatment response, increase of tinnitus loudness in 20% of patients and missing of any significant secondary outcome, the use of hf-tRNS as a general treatment for chronic tinnitus cannot be recommended at this stage. Differences in treatment responders between tRNS and rTMS highlight the need for individualized treatment procedures.

Conflict of interest statement

The study was supported by the Tinnitus Research Initiative. The authors have no conflicts of interest, financial or otherwise, related directly or indirectly to the submitted work.

Figures

Figure 1
Figure 1
Tinnitus Questionnaire (TQ) total score over the course of the trial.

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