Repetitive transcranial magnetic stimulation for tinnitus: a pilot study

Area of Science:

• Neuroscience
• Neuromodulation
• Medical Imaging

Background:

• Chronic tinnitus is often associated with altered cortical activity and attentional deficits.
• Low-frequency repetitive transcranial magnetic stimulation (rTMS) is a non-invasive neuromodulation technique explored for tinnitus treatment.

Purpose of the Study:

• To assess the effectiveness of neuronavigated low-frequency rTMS in patients with chronic tinnitus.
• To evaluate the impact of rTMS on attentional deficits and cortical asymmetry.
• To explore objective and subjective measures for evaluating rTMS treatment outcomes.

Main Methods:

• A randomized, placebo-controlled crossover pilot study involving four patients with chronic tinnitus.
• Active low-frequency rTMS or sham treatment was administered for 5 consecutive days.
• Subjective tinnitus, attentional vigilance (reaction time), and cortical activity (PET/CT) were assessed.

Main Results:

• Active rTMS, but not sham, led to a temporary reduction in tinnitus perception and improved reaction times.
• Positron emission tomography/computed tomography (PET/CT) scans showed reduced cortical activity immediately after active rTMS.
• Tinnitus symptoms returned in all patients by 4 weeks post-treatment.

Conclusions:

• Neuronavigated low-frequency rTMS shows promise for transiently alleviating tinnitus and improving attention.
• The observed improvements may be linked to the reduction of cortical asymmetry.
• Further trials are necessary to optimize rTMS techniques for sustained tinnitus relief.