Sudden Sensorineural Hearing Loss in Diving: my case, review, conclusions.

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apnea diver

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Messages
9
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Location
Los Angeles, California
# of dives
500 - 999
After 40 years of diving, it was my turn to get SSHL. I want to communicate my experience, the things I learned, and some advice. Disclaimer: I am not a doctor; this is all based on my experience dealing with this serious issue.
1. My case
I was freediving to around 20 feet, when my left ear clogged. I forced a Valsalva and was able to equalize. But when I returned to the surface my left ear felt a bit stuffy. I exited the water and all was fine for 2 days. Then on day 3 I woke up with muffled ear, full hearing loss, and tinnitus. The ENT diagnosed me with SSHL. It happens not only with divers, but many middle-aged people, who forcefully blow their nose, sneeze, or strain.
I started steroids (prednisone 60mg for a week, plus a week tapper off). After one week on prednisone, I got almost half of my hearing back. Then I started Hyperbaric oxygen treatment. I did 15 sessions, 90 min ea, at 2.5 atm, full oxygen. After the hyperbarics I got most of my hearing back. Still some tinnitus but I slowly learn how to deal with it.
2. What likely happened
We suspect that the forced Valsalva caused pressure in the middle ear, thus forcing the eardrum and the oval window out. As a result, the round window has to pull in, as it "decompresses" the cochlea. This probably caused some microscopic fissure on the round window. But it didn't leak much of the cochlea fluid. So I didn't get vertigo.
We didn't do any CT/MRI imaging, because it is not likely to show such a small fissure. Actually, as I found out in my research, even when exploratory surgery is done, the doctor cannot really see a fistula, let alone a tiny fissure. For this reason, some research suggests patching the round and oval window regardless. When the round or oval window tear, it is called a Perilymph Fistula. PLF is a subset of SSHL.
3. Advice for divers
I am not a doctor, but this is what I found out in the course of this ordeal. This was a wakeup call for me after 40 years of diving with zero problems freediving to 100' and scuba diving to 150'. SSHL is quite common in diving. It is well known in the dive community for many years. I searched the ScubaBoard and the SpearBoard (freedivers mainly). There was a plethora of similar cases. They went diving fine, and the next day or day after, they woke up deaf in one ear.
Here is what I learned:
  • Seek ENT advice ASAP. It is a medical emergency, and the longer you wait, the less likely the recovery. They say you have 2 weeks to do the steroids/hyperbarcis, or the PLF surgery. After that recovery is not guaranteed.
  • Avoid the Urgent care and ask your PCP for ENT referral. You must convince your PCP that this is a serious medical emergency.
  • If you get SSHL, avoid bending, weights, over-exertion, and pain killers, or decongestants.
  • Don't dive with or after a cold.
  • Don't force a Valsalva.
  • Don't let water in your mask, as it causes snot in your nose which will block your ear tubes.
My doctor said no diving for 3 months, and then we'll see. I plan to stop scuba and sell my gear (sigh...). I will continue snorkeling, maybe shallows, down to 10-15 feet. Hearing loss in one ear is a huge handicap as I found out. You cannot understand what people say. You cannot hear cars, sirens, or sense their direction.
Finally, I am so thankful to the ScubaBoard, because I found out so much info at a time when I was completely lost. Thank you all for sharing your experience, and the MDs on the list for offering valuable advice.
 
It's crucial to differentiate between inner ear barotrauma and sudden sensorineural hearing loss. SSHL could be considered one symptom of inner ear barotrauma in that IEBT can lead to hearing loss which would be considered sensorineural, and it occurs suddenly as described by @apnea diver . Other symptoms of IEBT include vertigo, tinnitus, and nausea.

There are many other causes of SSHL. If there's no evident cause, it's referred to as idiopathic sudden sensorineural hearing loss (ISSHL), which is thought to be related to ischemia of the inner ear apparatus. The treatments for the two are quite different. ISSHL is an indication for hyperbaric oxygen therapy. Hyperbaric oxygen therapy is absolutely contraindicated in inner ear barotrauma as it could lead to further damage.

The takeaway is not to get stuck on the term SSHL if you believe you've suffered from inner ear barotrauma. Providers who are not trained and experienced in evaluating divers may lean more toward idiopathic SSHL in a diver who actually has IEBT, since they're more used to seeing ISSHL. Self-advocacy is important here, as @apnea diver emphasized above.

Best regards,
DDM
 
Indeed, you are making a very good point. I suspect I got IEBT by forcing a Valsalva. (perhaps some degree of PLF). But my ENT thought that because it happened 3 days after diving, he was leaning more towards SSHL, which is a broader and "safer" diagnosis for him.
I am questioning whether the HBOT had any real benefit in my case. It is quite possible that all the improvement was due to the steroids. (I got 50% of my hearing back after 1 week of prednisone without HBOT). I was very careful inside the HBOT chamber to equalize gradually, and I used Flonase spray during this timeframe to make equalization easy.
One thing that is worth noting, is that I still feel "uncomfortable" doing a gentle Valsalva maneuver. I think it implies that there is some residual trauma to the cochlea membranes.
 

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