[abstract]APPLICATION OF INTERCONNECTED AND PARALLEL DECOMPRESSION MODELS TO PDE DATA

Rubicon Research Repository/Manakin Repository

[abstract]APPLICATION OF INTERCONNECTED AND PARALLEL DECOMPRESSION MODELS TO PDE DATA

Show full item record


Title: [abstract]APPLICATION OF INTERCONNECTED AND PARALLEL DECOMPRESSION MODELS TO PDE DATA
Author: Goldman, S; Campbell, S
Abstract: Background: DAN’s “Project Dive Exploration” (PDE), involves collecting recreational dive profiles, together with their outcomes [1]. The purpose of this study was to apply current decompression models to these profiles, to determine how well these models predicted the observed outcomes. Methods: Two pre-existing interconnected three-compartment models (3cm, 3cmb), a basic two-compartment independent parallel model (2cp), and the LE1 model were used. These models and their calibration (by “Maximum Likelihood”) were all described in detail previously [2,3]. The models were used to predict the mean probability of decompression sickness per profile, (PDCS), and there-from the expected number of hits, (NH), for the air and nitrox profiles in the data set. The data set we used contained 88,649 and 5,689 air and nitrox individual dive profiles, respectively. Since most dives in this data set were repetitive, a “cut-off” time is needed to define the beginning/end of a repetitive dive profile. We used a cut-off time of 12 hours, resulting in 42,697 and 3,298 air and nitrox repetitive profiles, respectively. Results: For air and nitrox the observed (NH) values were 29 (19-42) and 0 (0-3.7), respectively; the entries in parenthesis give the 95 percent Binomial confidence intervals. Both interconnected models predicted (NH) values that were within the corresponding confidence intervals: 32.5 (3cm), 32.5 (3cmb), air; 0.46 (3cm), 2.49 (3cmb), nitrox. The independent parallel (2cp) model and the LE1 models predicted (NH) values that were too high in all instances: 881 (2cp), 142 (LE1), air; 57(2cp), 4.4 (LE1), nitrox. Conclusions: Both interconnected models correctly predicted the observed number of hits, while both parallel models predicted too many hits for both air and nitrox. References 1. Dunford. UHM 38:465 (2011). 2. Goldman. J APPL PHYSIOL 103:484 (2007); UHM 34:229 (2007); UHM 36:249 (2009). 3. Thalmann. UHM 24:255. (1997); Howle. COMP BIOL MED doi: 10.1016 (2009).
Description: Undersea and Hyperbaric Medicine : Journal of the Undersea and Hyperbaric Medical Society, Inc.
URI: http://archive.rubicon-foundation.org/10443
Date: 2012

Files in this item

Files Size Format View
abstract.txt 258bytes Text file View/Open

This item appears in the following Collection(s)

  • UHMS Meeting Abstracts
    This is a collection of the published abstracts from the Undersea and Hyperbaric Medical Society (UHMS) annual meetings.

Show full item record

Browse

My Account