Clinical trial NCT06729632: Non-Invasive System to Deliver Therapeutic Hypothermia for Protection Against Noise-Induced Hearing Loss
Official title: Non-Invasive System to Deliver Therapeutic Hypothermia for Protection Against Noise-Induced Hearing Loss
Study type: INTERVENTIONAL
Overall status: RECRUITING
Phase: NA
Conditions: Noise Exposure
Noise-induced Hearing Loss
Noise; Adverse Effect
Mild Therapeutic Hypothermia
Cooling
Occupational Exposure
Occupational Health
Hidden Hearing Loss
Keywords: hearing preservation
hearing loss
noise-induced hearing loss
noise exposure
mild therapeutic hypothermia
cooling
post-exposure
prevention
Lead sponsor: Restorear Devices LLC
Sponsor class: INDUSTRY
Collaborators: name: University of Miami
name: National Institute on Deafness and Other Communication Disorders (NIDCD)
First posted: 2024-12-11
Enrollment: 116
Sex: ALL
Minimum age (years): 18
Maximum age (years): 55
Standard ages: ADULT
Accepts healthy volunteers: yes
Allocation: NON_RANDOMIZED
Intervention model: PARALLEL
Intervention model description: Aim 1 studies will use a crossover study design. Aim 2 studies will use a parallel model.
Primary purpose: PREVENTION

Brief summary: The goal of this interventional clinical study is to investigate the use of mild therapeutic hypothermia devices for preservation of sensory structures in the cochlea after noise exposure. The main aims of the study are:

1. To test the safety and best duration for use for a new hypothermia device.
2. To determine if the hypothermia device helps decrease noise-induced hearing loss in a group of firefighters.

Participants will wear the mild therapeutic hypothermia therapy devices immediately after a fire service shift serially over a year. Researchers will compare results from those receiving the therapy to those from a control group (individuals receiving no therapy and a sham therapy).

Detailed description: Noise-induced hearing loss (NIHL) is highly prevalent among occupationally at-risk service groups like the military and firefighters, with disabilities that result in significant healthcare burden, negatively impacting performance on duty and quality of life. Exposure to noise can cause permanent threshold shifts (PTS) with accompanying hair cell loss, or temporary threshold shifts (TTS), with no evident hair cell loss. Noise exposure can also result in rapid and permanent loss of synaptic elements and cochlear nerve terminals with irreversible hearing impairment and long-term degeneration of spiral ganglion (SG) cell bodies.

Currently no FDA-approved treatments are available to prevent or treat NIHL. Delivering pharmaceutical compounds over time, identification of safe dosages, and a critical timeframe relative to noise-exposure remain clinically challenging. RestorEar Devices LLC has developed a non-pharmaceutical application of mild therapeutic hypothermia (MTH) to protect residual sensory structures and function of the cochlea. MTH is a proven and well-established therapy for neuroprotection. This approach for MTH application is based on significant prior and on-going research that highlights its utility for residual hearing preservation against cochlear implant surgical trauma, ototoxicity, and noise exposure. With SBIR Phase I support, the investigators have successfully demonstrated that effective non-invasive, non-pharmaceutical therapeutic hypothermia can be delivered to the inner ear sensory structures. The investigators have built, calibrated, and tested ReBoundTM, a headband with cooling gel packs placed in contact with the surface of the mastoid. ReBoundTM delivers MTH safely and repeatedly for up to 30 minutes. In this study, the investigators aim to extend this application to human subjects and test safety and efficacy against NIHL in noise-exposed firefighters and matched controls with the collaboration of researchers at the University of Miami.

Aim 1: Evaluate safety of MTH with ReBoundTM devices. With the first in-human studies, the investigators aim to show that MTH can be safely delivered to the inner ear using ReBound. In a randomized study, non-firefighter control subjects will receive MTH-treatment and normothermia-sham (non-cooled gel pack) through the device alternated over 8 sessions. Subjective assessments and audiologic testing (pure tone audiometry, auditory brainstem responses, distortion product otoacoustic emissions and electrocochleography) pre- and post-treatments will be compared between MTH-treatment and sham in each subject. Results of Aim 1 will support the hypothesis that this approach will deliver therapeutic hypothermia to the cochleae and that repeated application will not negatively affect hearing function in healthy subjects.

Aim 2: Validate efficacy of the ReBoundTM MTH devices for mitigating NIHL in an occupationally at-risk group. Based on strong preliminary results, the investigators hypothesize that acute application of MTH in noise-exposed firefighters will reduce temporary changes in auditory function. Firefighters will be divided equally into two treatment groups, MTH-treatment and normothermia-sham. These treatments will be delivered with ReBound, with and without cooled gel packs, applied post-duty. MTH-treatment will also be applied in an age- and sex-matched control group over the same duration. Baseline hearing function will be measured prior to initiation of the treatment. Treatments and the functional assessments will be repeated quarterly over one year. Temporary and permanent threshold changes in this chronically the noise exposed group of firefighters receiving MTH-treatment will be compared with firefighters receiving sham-treatment and with controls receiving MTH-treatment. MTH-groups will also be sent home with a ReBound band and instructed to use it after noise exposure. Subjective assessments will be sent weekly to these groups to evaluate the use pattern of the device. Results of these studies will firmly establish MTH for mitigating NIHL.

This research will be highly impactful given the significant adverse effects of NIHL, an unmet clinical need, and the high translational potential of MTH for mitigating NIHL.

Eligibility criteria: Inclusion Criteria:

* Adults aged 18-55 years old at the time of signing the consent form
* Fluency in English

Exclusion Criteria:

* Abnormal tympanometric findings
* Abnormal pure tone audiometry from 500-8,000 Hz (Non-firefighters only)
* Significant history of noise exposure (Non-firefighters only)
* Temporomandibular joint disorder
* Otologic pathologies (including, but not limited to): acoustic neuroma/vestibular schwannoma, chronic ear disease, Meniere's disease, documented fluctuating hearing loss, or ototoxicity
* Current recipients of medical, pharmacologic, or therapeutic intervention for tinnitus or other otologic conditions
* Active hearing aid users
* Adults unable to consent

Primary outcomes:
measure: Pure Tone Audiometry
timeFrame: Safety Arm: Twice per week, pre- and post- treatment, to the end of treatment at 4 weeks. Efficacy Arms: Every 3 months, pre- and post-treatment, for 1 year.
measure: Distortion Product Otoacoustic Emissions
timeFrame: Safety Arm: Twice per week, pre- and post- treatment, to the end of treatment at 4 weeks. Efficacy Arms: Every 3 months, pre- and post-treatment, for 1 year.
measure: Adverse Event Questionnaire
timeFrame: Immediately post-treatment; 3-hours and 24-hours post-treatment.
Secondary outcomes:
measure: Device Acceptance Questionnaire
timeFrame: Safety Arm: Post-initial treatment and at the end of week 4 post-enrollment; Efficacy Arms: Post-initial treatment and at the end of 12 months
measure: Weekly Use Surveys
timeFrame: Weekly, from enrollment to end of treatment at 52 weeks.
Other outcomes:
Locations:
city: Miami
country: United States
facility: University of Miami
state: Florida
Study officials:
affiliation: RestorEar Devices
name: Suhrud M Rajguru, PhD
role: PRINCIPAL_INVESTIGATOR
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