Management of Post-Diving Hearing Loss
This patient requires urgent audiometry to confirm sudden sensorineural hearing loss (SSNHL), followed by immediate initiation of corticosteroid therapy within 2 weeks of symptom onset, with consideration for hyperbaric oxygen therapy given the diving-related etiology. 1
Immediate Diagnostic Steps
The absence of pain, fever, or discharge makes middle ear infection unlikely, but you must distinguish between conductive and sensorineural hearing loss:
- Perform Weber and Rinne tuning fork tests immediately (or have the patient hum—if louder in the affected ear, suggests conductive loss) 1
- Obtain formal audiometry urgently to document the degree and type of hearing loss 1
- Do NOT order routine labs or x-rays—they are not recommended 1
Critical Diving-Specific Considerations
Diving-related hearing loss has two distinct mechanisms with different prognoses:
- Inner ear barotrauma (IEB): More common in shallow dives, often presents with middle ear symptoms, generally has better prognosis 2
- Inner ear decompression sickness (IEDCS): More common in dives >30m depth, associated with worse outcomes, especially if systemic DCS symptoms present 2
Ask specifically about:
- Dive depth (>30m increases IEDCS risk) 2
- Ascent technique (rapid/improper ascent increases risk) 3
- Any other neurologic symptoms suggesting decompression sickness 2
- Vertigo (present in 80% of IEB, 66.7% of IEDCS cases) 2
Treatment Algorithm
If SSNHL Confirmed on Audiometry:
1. Initiate Corticosteroids Immediately (within 2 weeks of onset) 1
Oral steroid regimen:
- Prednisone 1 mg/kg/day (max 60 mg/day) OR
- Methylprednisolone 48 mg/day OR
- Dexamethasone 10 mg/day
- Full dose for 7-14 days, then taper over similar period 1
Alternative: Intratympanic steroids (if oral contraindicated or patient preference):
- Dexamethasone 24 mg/mL or methylprednisolone 40 mg/mL
- 0.4-0.8 mL injected into middle ear
- Up to 4 injections over 2 weeks
- Keep affected ear up for 15-30 minutes post-injection 1
2. Consider Hyperbaric Oxygen Therapy 1
- Particularly important in diving-related cases where decompression sickness may be involved 2, 4
- Must be initiated within 2 weeks of onset (up to 1 month if combined with steroids) 1
- Patients with concomitant DCS show poorer recovery without hyperbaric oxygen 2
- Early recompression treatment required to avoid permanent inner ear damage 4
3. If Incomplete Recovery After Initial Therapy:
- Offer salvage intratympanic steroids 1
If Perilymphatic Fistula Suspected:
Consider exploratory tympanoscopy with round/oval window sealing if:
- Sudden profound hearing loss
- Persistent symptoms despite medical therapy
- History suggests barotrauma mechanism 5, 6
However, note that surgical outcomes are variable and medical therapy should be attempted first 5, 6.
Imaging Considerations
MRI of internal auditory canals should be ordered to exclude vestibular schwannoma, though this is not urgent and can be done after treatment initiation 1. This is particularly important as SSNHL can rarely be the presenting symptom of such tumors.
Prognosis Discussion
Be transparent with the patient:
- One-third to two-thirds may recover spontaneously within 2 weeks 1
- Those recovering 50% of hearing in first 2 weeks have better prognosis 1
- Presence of vertigo at onset indicates poorer prognosis 1
- Diving-related cases with middle ear symptoms (IEB) appear to have more favorable outcomes than pure IEDCS 2
- Minimal improvement by 2 weeks suggests unlikely significant recovery 1
Common Pitfalls to Avoid
- Don't delay treatment waiting for spontaneous recovery—the 2-week window is critical 1
- Don't prescribe antivirals—insufficient evidence for effectiveness 1
- Don't miss decompression sickness—ask about dive depth and other systemic symptoms, as this changes management urgency 2
- Don't assume middle ear pathology just because of diving history—inner ear injury is common and requires different treatment 2, 3