Accession Number:

ADA243667

Title:

Statistically-Based Decompression Tables. 6. Repeat Dives on Oxyen/ Nitrogen Mixes

Descriptive Note:

Technical rept. Sep 88-Nov 89

Corporate Author:

NAVAL MEDICAL RESEARCH INST BETHESDA MD

Personal Author(s):

Report Date:

1991-10-01

Pagination or Media Count:

69.0

Abstract:

This risk of decompression sickness DCS during dives on various nitrogenoxygen breathing mixes is analyzed using likelihood maximization. Risk is treated as cumulative, resulting from periods during which the partial pressure of dissolved N2 exceeds the hydrostatic pressure in one or more hypothetical separate tissues. Gas uptake and release are assumed to follow either mono- or bi-exponential kinetics. The database consists of 2006 well- documented wet man-dives. No statistical evidence is found to justify the use of different models or different parameter values for single dives versus repeat dives or for dives on different N2O2 mixes. Under these models, then, the single and repeat dives in our database should be considered as belonging to the same population. However, the models do not adequately predict the probability of DCS associated with a series of 128 multilevel dives which feature ascents to 20-30 fsw interspersed with deeper excursions while simultaneously making a plausible prediction of the risk of any other type of dive in the database.

Subject Categories:

  • Stress Physiology
  • Theoretical Mathematics
  • Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE