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Biophysical basis for inner ear decompression sickness.

David J Doolette1, Simon J Mitchell

  • 1Anaesthesia and Intensive Care, The University of Adelaide, Adelaide 5005, Australia. david.doolette@adelaide.edu.au

Journal of Applied Physiology (Bethesda, Md. : 1985)
|February 4, 2003
PubMed
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Inner ear decompression sickness (DCS) can occur during deep dives with helium-oxygen. A new model shows how gas shifts during decompression can cause DCS in the inner ear.

Area of Science:

  • Physiology
  • Diving Medicine
  • Biophysics

Background:

  • Isolated inner ear decompression sickness (DCS) is a known risk in deep diving.
  • The biophysical mechanisms underlying the inner ear's vulnerability to DCS remain unclear.

Observation:

  • This study models inert gas kinetics specifically within the human inner ear.
  • Simulations were based on anatomical and physiological data relevant to deep dives and gas switching.

Findings:

  • The model predicts significant supersaturation and potential bubble formation during conventional decompression.
  • Counterdiffusion of helium and nitrogen can cause inner ear supersaturation even without decompression, particularly after gas switches.
  • Standard decompression protocols may be insufficient for deep dives, increasing DCS risk.

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Implications:

  • Current decompression algorithms may require adjustment for deep dives to protect the inner ear.
  • Strategic scheduling of breathing gas switches, either deep or shallow, is crucial to mitigate DCS risk during decompression.