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Decompression tables and dive-outcome data: graphical analysis.

H D Van Liew1, E T Flynn

  • 1Navy Experimental Diving Unit, Panama City, FL 32407, USA.

Undersea & Hyperbaric Medicine : Journal of the Undersea and Hyperbaric Medical Society, Inc
|October 22, 2005
PubMed
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Experimental air dives show that current U.S. Navy decompression tables may not provide adequate safety, as divers developed decompression sickness (DCS) despite longer total decompression times (TDTs). This highlights potential risks with existing air diving protocols.

Area of Science:

  • Diving Medicine
  • Physiology
  • Risk Assessment

Background:

  • Decompression sickness (DCS) is a risk in air diving.
  • Various decompression tables exist, including U.S. Navy, Canadian forces, VVal-18, and University of Pennsylvania tables.
  • The NMRI'98 Model provides probabilistic risk assessments for decompression.

Purpose of the Study:

  • To compare the safety and efficacy of different air decompression tables.
  • To identify potential inadequacies in existing decompression algorithms.

Main Methods:

  • Analysis of experimental air dive profiles from the U.S. Navy Decompression Database.
  • Comparison of total decompression times (TDTs) from experimental dives with DCS against prescribed TDTs from various tables.
  • Evaluation of TDTs from the NMRI'98 Model against experimental dive outcomes.

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Main Results:

  • Many experimental dives resulting in DCS had longer TDTs than prescribed by the U.S. Navy table.
  • The U.S. Navy table appears to provide insufficient decompression time for longer bottom times, increasing DCS risk.
  • Canadian forces table showed similar, though lesser, issues.
  • VVal-18 and University of Pennsylvania tables had fewer DCS cases with longer TDTs compared to some experimental dives.

Conclusions:

  • Significant discrepancies exist among different air decompression table instructions.
  • The U.S. Navy decompression table may be inadequate for divers undertaking long bottom times, potentially leading to higher rates of decompression sickness.
  • Further research and table revisions are warranted to enhance diver safety.