Tinnitus Maskers: Management Modalities (ENT Textbook Reference)

What Is a Tinnitus Masker?

Classification of Tinnitus Masking Devices

Mechanism: Residual Inhibition

Modern/Recent Management Modalities of Tinnitus Maskers

1. Sound Therapy (Broadband Noise / White Noise)

• Mechanism: Broadband or narrowband noise delivered at a low level to partially or completely mask tinnitus.
• Delivery: Ear-level devices (behind-the-ear or in-the-canal style), tabletop sound generators, smartphone apps.
• Current role: Used as a component within Tinnitus Retraining Therapy (TRT), not as standalone therapy.
• In TRT, sound generators deliver broadband noise at a sub-masking level (just below the level of tinnitus), rather than attempting total masking. This is intentional and mechanistically different from pure masking.

2. Tinnitus Retraining Therapy (TRT) - The Gold Standard Sound-Based Approach

• TRT Effectiveness: Several studies report significant improvement in 75-80% of patients. More severe cases tend to have superior results. Studies confirm that patients who use the recommended sound-generating instrumentation alongside counseling have better outcomes than counseling alone.
• Duration: Typically 12-18 months of treatment.
• TRT in hyperacusis: TRT has also shown superiority over tinnitus alone for hyperacusis (63% improvement vs 47%), improving loudness discomfort levels by ~12.5 dB and broadening dynamic range by ~11.3 dB.

3. Combination Hearing Aids with Maskers

• A combination device (hearing aid + sound generator) is the first-line device intervention.
• The amplification component restores auditory input, which itself reduces tinnitus by improving the signal-to-noise ratio in the brain.
• The noise generator provides additional masking when amplification alone is insufficient.
• Modern digital hearing aids with open-fit designs (thin tubing, open ear canal) are particularly useful as they amplify high-frequency sounds (where tinnitus is most common) while allowing ambient sound in naturally.
• Important: Hearing aids are not expected to work in patients whose tinnitus pitch is above the frequency capability of the device - but classical experiments by Feldman showed tinnitus can be suppressed by sounds across many frequencies, so this limitation is less than previously assumed.

4. Digital/Programmable Sound Masking Devices

• Adjust the frequency spectrum of the masking noise to match or bracket the patient's tinnitus pitch
• Set intensity precisely (especially sub-threshold for TRT protocols)
• Use multimemory settings - patient selects different environments (quiet room, noisy office, outdoors)
• Access datalogging - tracks how much time is spent in different environments and user preferences, enabling fine-tuning at follow-up appointments

5. Smartphone Apps and Internet-Based Sound Therapy

• Smartphone apps deliver customizable sound therapies (white noise, pink noise, notched music, nature sounds) at low cost.
• Notched music therapy - music with energy removed at the tinnitus frequency - is based on lateral inhibition; reduces tinnitus loudness by inhibiting the tinnitus-generating neurons in auditory cortex (emerging evidence).
• Internet-delivered CBT with sound therapy components has shown similar results to in-person therapy at lower cost and time burden.

6. Cognitive Behavioral Therapy (CBT) - Combined with Sound Therapy

• Cochrane review: Significant improvement in depression and QoL, though does not alter subjective tinnitus loudness.
• Meta-analysis of 15 RCTs: CBT effectively reduces annoyance and distress, with persistent long-term benefits.
• Sessions: 60-120 minutes weekly, for 8-24 weeks.
• Acceptance and Commitment Therapy (ACT) is a closely related approach that has shown comparable results to CBT for tinnitus distress and improves sleep compared to TRT alone.

7. Electrical Stimulation (Emerging/Experimental)

• Transcranial Magnetic Stimulation (TMS) and Transcranial Direct Current Stimulation (tDCS) target the hyperactive auditory cortex.
• Vagus Nerve Stimulation (VNS) paired with auditory tones - an implanted pulse generator delivers electrical impulses to the vagus nerve timed to specific auditory stimuli, aiming to reorganize cortical tonotopic maps via neuroplasticity (see illustration below).
• These remain adjunctive/experimental options and are not first-line.

8. Pharmacological Therapy (Limited Role)

• Antidepressants (TCAs, SSRIs, trazodone): Modest improvement seen in some studies, likely via modulation of comorbid anxiety/depression rather than a direct anti-tinnitus effect.
• Anticonvulsants (carbamazepine, gabapentin): All placebo-controlled trials negative.
• Anxiolytics (benzodiazepines - oxazepam, clonazepam): Some reduction in tinnitus severity on visual analog scale, but no significant THI difference; dependency risk limits use.
• Acamprosate (GABA/glutamate modulator): Promising in 2 small RCTs, but insufficient evidence to recommend routinely.
• Medications should only be used if comorbid psychiatric illness (anxiety, depression) is present and needs treatment in its own right.

9. Surgical Options (Rare and Targeted)

• Cochlear implantation - For patients with profound SNHL + tinnitus; restores auditory input and markedly reduces tinnitus in most cases.
• Microvascular decompression - If tinnitus is caused by vascular compression of CN VIII (rare).
• Removal of causative lesions (e.g., acoustic neuroma, glomus tumor, otosclerosis surgery, patulous eustachian tube repair) - Treats the underlying structural cause; tinnitus may or may not improve.

Simplified Summary Table

Key Clinical Points to Remember

1. Tinnitus maskers do NOT cure tinnitus - they manage it by reducing perception, distress, and disability.
2. The most effective modern approach combines sound therapy with counseling (TRT or CBT) - neither alone is as effective as the combination.
3. Always treat the underlying hearing loss first - a hearing aid alone can resolve tinnitus in many patients with SNHL.
4. Residual inhibition (post-masking quiet period) has theoretical appeal but is clinically impractical (lasts only seconds to minutes).
5. Physician counseling and reassurance is the first and most important step - negative counseling (e.g., "nothing can be done") worsens outcomes significantly.
6. Current AAO guidelines do not recommend routine medications, routine imaging, or intratympanic medications for uncomplicated subjective tinnitus.