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Recreational technical diving part 2: decompression from deep technical dives.

David J Doolette1, Simon J Mitchell

  • 1Navy Experimental Diving Unit, Panama City Beach, FL 7012, USA. david.doolette.as@navy.mil

Diving and Hyperbaric Medicine
|July 2, 2013
PubMed
Summary
This summary is machine-generated.

Technical divers face inefficient decompression. This review examines scientific evidence on decompression algorithms and gas switches, finding shallow-stop algorithms may be more efficient than bubble algorithms, and helium-to-nitrogen switches can increase risks.

Keywords:
decompressiondecompression sicknessdecompression tablesdeep divinginner earmodelsreview articletechnical divingtrimix

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Area of Science:

  • Diving Medicine
  • Physiology
  • Risk Management

Background:

  • Technical diving involves deep, mixed-gas 'bounce' dives requiring lengthy decompression.
  • Current decompression schedules are based on modified algorithms, often driven by anecdotal evidence rather than scientific data.
  • Locating and examining scientific evidence for technical diving decompression practices is challenging.

Purpose of the Study:

  • To review and analyze existing scientific evidence relevant to technical diving decompression practices.
  • To evaluate the efficacy and safety of various decompression algorithms and gas-switching strategies.
  • To provide evidence-based insights for optimizing technical diving decompression protocols.

Main Methods:

  • Comprehensive literature review of scientific evidence related to technical diving decompression.
  • Examination of data on decompression algorithms (bubble vs. gas-content) and their efficiency.
  • Analysis of studies on the effects of breathing gas composition changes (helium-nitrogen switches) during ascent and decompression.

Main Results:

  • Recent laboratory data suggest traditional shallow-stop, gas-content algorithms may be more efficient than bubble algorithms.
  • Switching from helium to nitrogen during ascent is unlikely to accelerate decompression for typical technical dives.
  • Evidence indicates a higher prevalence of neurological decompression sickness (DCS) with helium-oxygen compared to nitrogen-oxygen, and potential benefits of switching to air.
  • Helium-to-nitrogen switches may increase the risk of inner-ear DCS, with strategies to mitigate this risk identified.

Conclusions:

  • The efficiency of decompression algorithms in technical diving requires re-evaluation, with potential advantages for shallow-stop approaches.
  • Breathing gas composition during decompression significantly impacts DCS risk, particularly for neurological and inner-ear presentations.
  • Evidence-based strategies, including optimized gas switching and adequate initial decompression, are crucial for enhancing safety in technical diving.