MAXIMUM LIKELIHOOD ANALYSIS OF BUBBLE INCIDENCE FOR MIXED GAS DIVING

Authors
  1. Tikuisis, P.
  2. Gault, K.
  3. Carrod, G.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
The method of maximum likelihood has been applied to predict the incidence of bubbling in divers for both air and helium diving. Data were obtained from 108 air man-dives and 622 helium man-dives conducted experimentally in a hyperbaric chamber. Divers were monitored for bubbles using Doppler ultrasonics during the period from surfacing until approximately 2 h after surfacing. Bubble grades were recorded according to the K-M code, and the maximum value in the precordial region for each diver was used in the likelihood analysis. Prediction models were based on monoexponential gas kinetics using one and two parallel-compartment configurations. The model parameters were of three types: gas kinetics, gas potency, and compartment gain. When the potency of the gases was not distinguished, the risk criterion used was inherently based on the gas supersaturation ratio, otherwise it was based on the potential bubble volume. TRUNCATED
Report Number
DCIEM-89-P-53 — Research Paper; Reprint
Date of publication
15 Nov 1989
Number of Pages
11
Reprinted from
Undersea Biomedical Research, vol 17, no 2, 1990, p 159-169
DSTKIM No
90-02599
CANDIS No
64857
Format(s):
Hardcopy;Originator's fiche received by DSIS

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