Breast Cancer Breakthrough: New Trial Results

A Trial Tests Two Nerves for Tinnitus Relief

Approximately 12-30% of adults live with tinnitus, a persistent perception of sound like ringing or buzzing without an external source. The condition is closely linked to anxiety, sleep problems, and autonomic nervous system imbalance. Drug treatments often have limited effect and side effects. A new clinical trial in Taiwan is now recruiting to test if stimulating specific nerves through the foot and ear can offer a new path for relief.

The Science of Stimulating the Vagus Nerve and Foot Reflexes

The “FR-taVNS Tinnitus Tria” is built on two distinct physiological approaches. Transcutaneous auricular vagus nerve stimulation (ta-VNS) applies a mild electrical current to specific parts of the outer ear, which contains branches of the vagus nerve. This nerve is a major component of the parasympathetic nervous system, which calms the body. Stimulating it may reduce the overactive neural activity thought to underlie some forms of tinnitus and improve associated autonomic dysregulation.

Foot reflexology is based on the premise that specific points on the foot correspond to other body areas, including the inner ear. The trial’s protocol includes a phase focused on the “inner-ear/autonomic regulation” reflex point. Researchers hypothesize that stimulating this area may influence tinnitus through neural pathways or general relaxation, reducing the stress that often worsens the condition.

How the Three-Arm, Single-Blind Trial Works

Led by investigators at Hualien Tzu Chi Hospital, this is a randomized, single-blind, sham-controlled study. It aims to enroll 180 non-cancer adults aged 18 to 75 who have tinnitus as their main complaint and normal hearing thresholds. Participants are stratified by age and sex, then randomly assigned to one of three groups: foot reflexology (FR), ta-VNS, or usual-care control. To control for placebo effects, the FR and ta-VNS groups are further split into true intervention and sham subgroups.

The active interventions are administered once weekly for 20 minutes over four consecutive weeks. The true ta-VNS group receives stimulation to the left tragus, cymba conchae, and cavum conchae. The intensity is set to produce a tingling sensation. The sham ta-VNS group receives a low, likely imperceptible current to the left earlobe. For foot reflexology, the true intervention follows a specific protocol, while the sham uses only light, non-specific touch. All participants in the two active arms also perform daily self-administered auricular acupressure with magnetic beads.

Measuring Change in Symptoms and Stress Biology

The trial’s primary goal is to determine if these interventions improve tinnitus severity. Researchers will also track psychological distress and sleep quality using validated questionnaires. A distinctive feature is the inclusion of biological measures of the autonomic nervous system and stress response: heart rate variability and levels of the stress hormone cortisol in saliva.

Outcomes are measured four times: at baseline (T0), week 2 (T1), at the end of the intervention period at week 4 (T2), and at a follow-up visit four weeks later (week 8, T3). This schedule allows the team to assess both immediate effects and whether any benefits persist after treatment stops. Data will be analyzed using generalized estimating equation models to track changes over time across the different groups.

Who Can Participate and Current Status

The trial has specific eligibility criteria. Eligible participants must have subjective tinnitus with normal pure-tone hearing thresholds (≤25 dB HL at key frequencies). They must be able to communicate and complete study procedures. The exclusion criteria are designed for safety and to limit confounding factors. Individuals are excluded if they have objective tinnitus, certain ear pathologies, open wounds on the foot or ear, diabetes with poor control (HbA1c >7.5%), a cardiac pacemaker, or a history of seizures. Previous foot reflexology or vagus nerve stimulation within three months also excludes participation.

As of the latest update, this trial’s status is RECRUITING. The study team is actively seeking the full cohort of 180 participants at their hospital site in Hualien, Taiwan.

Potential Implications for Future Tinnitus Care

If the trial shows positive results, it could support the integration of non-invasive neuromodulation and somatic therapies into standard tinnitus management. A key question is whether the benefits come from direct neurological modulation—as hypothesized with ta-VNS—or from generalized relaxation and stress reduction common to both approaches. The inclusion of sham controls and biological markers aims to help answer this.

For patients, success could mean access to new, drug-free options that address both the perceived sound and its common, debilitating companions: anxiety and poor sleep. The findings may also encourage a more holistic view of tinnitus, treating it as a condition involving both the auditory system and broader neural and stress-response networks. The eight-week follow-up will be critical to understand the durability of any effects from these relatively brief interventions.

Source:
FR-taVNS Tinnitus Tria (ClinicalTrials.gov: NCT07711639)

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