How should autophony (hearing one's own voice, breathing, or heartbeat loudly) be evaluated and managed, particularly when caused by a patulous eustachian tube?

Autophony: Evaluation and Management

For autophony caused by patulous eustachian tube (PET), diagnosis requires clinical symptoms plus objective confirmation via compliance-over-time (COT) testing or direct visualization of tympanic membrane movement with respiration, followed by conservative management for 6 months before considering surgical intervention with silicone plug insertion or endoscopic ligation.

Diagnostic Approach

Clinical Presentation

PET presents with a characteristic symptom cluster 1:

• Autophony (hearing one's own voice loudly) - present in 86.8% of cases 2
• Aerophony (hearing one's own breathing) - 91.0% 2
• Aural fullness - 82.0% 2
• Symptomatic relief with position changes (lying down) - 76.2% 2
• Relief with sniffing or Valsalva - 66.1% 2

Objective Confirmation

The Japan Otological Society diagnostic criteria require 1:

For "Definite PET" - all three required:

1. Characteristic aural symptoms
2. Symptom relief with tubal obstruction procedures (sniffing, lying down)
3. Objective findings on examination or testing

For "Possible PET" - two of three criteria

Specific Diagnostic Tests

Primary diagnostic method: Compliance-over-time (COT) testing with ipsilateral nostril deep breathing shows 96.3% sensitivity and is the most practical screening tool 2. This test detects tympanic membrane oscillation synchronized with respiration.

Alternative objective assessments:

• Direct otoscopic visualization of tympanic membrane "respiration" (positive in 55% of cases) 2
• Objective autophony measurement during phonation (EAC/Voice ratio >14.7 indicates PET) 3
• CT imaging to assess bony ET patency before surgical planning 1

Critical pitfall: Do not rely solely on sonotubometry, as it shows poor correlation with autophony-specific testing and may miss cases 3.

Management Algorithm

Conservative Treatment (First-Line, 6 Months Minimum)

Conservative therapy is mandatory before surgical consideration 1:

1. Weight restoration if weight loss preceded symptoms (PET often weight-dependent, symptoms recur below critical threshold) 4
2. Hydration optimization and avoidance of diuretics
3. Nasal saline irrigation to maintain mucosal moisture
4. Head-down positioning during symptomatic episodes
5. Speech therapy for associated hypernasality 5

Surgical Intervention Criteria

Proceed to surgery only if 1:

• Definite PET diagnosis confirmed
• PHI-10 symptom score ≥26
• Failed 6 months of conservative treatment
• Symptoms significantly impair quality of life

Surgical Options (Ranked by Evidence Quality)

First-line surgical approach: Silicone plug (Kobayashi plug) insertion 1

• 23mm silicone plug inserted via myringotomy under local anesthesia
• Requires CT confirmation of bony ET patency preoperatively
• Endoscopic guidance ensures proper positioning
• Most standardized approach with established criteria

Alternative surgical techniques:

1. Endoscopic multilayer ligation 6

   • 85.7% sustained improvement (75% complete resolution)
   • Combines fat plugging, endoluminal cauterization, and suture ligation
   • Mean operative time 45 minutes
   • No hearing impact on postoperative audiometry

2. Trans-tympanic cartilage chip insertion 7

   • 64.3% complete or satisfactory improvement at >12 months
   • Uses tragal cartilage to fill tubal valve concavity
   • Transcanal approach, no complications reported

3. Combined balloon dilation with fat injection 4

   • Temporary relief (6 months duration)
   • May require repeat intervention
   • Consider for weight-dependent cases

Important caveat: Systematic review shows wide outcome variability (7-77% complete relief, 7-86% improvement) across surgical techniques, with no aggravation of symptoms reported 8. This reflects heterogeneity in patient selection and technique rather than treatment failure.

Monitoring and Follow-up

• Preoperative assessment: PHI-10 questionnaire, audiometry, CT imaging 1
• Postoperative evaluation: Symptom questionnaire at 6 and 12 months minimum
• Acoustic monitoring: Nasalance and voice quality metrics for cases with hypernasality 5
• Weight monitoring: Maintain weight above threshold that triggers symptoms 4

Key Clinical Pearls

Do not confuse PET with otitis media with effusion - the provided OME guidelines 9, 10 address a completely different pathology (middle ear fluid vs. abnormally patent ET) and are not applicable to PET management.

Female predominance: PET occurs more frequently in females, particularly with pregnancy, oral contraceptives, or eating disorders 1.

Avoid premature ventilation tube insertion: This intervention for aural fullness may worsen autophony symptoms and does not address the underlying PET pathology 4, 5.