[abstract] OBSERVED BUBBLES AND DECOMPRESSION ILLNESS INCIDENCE

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[abstract] OBSERVED BUBBLES AND DECOMPRESSION ILLNESS INCIDENCE

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Title: [abstract] OBSERVED BUBBLES AND DECOMPRESSION ILLNESS INCIDENCE
Author: Eftedal, O; Brubakk, AO
Abstract: BACKGROUND: We have previously described a grading scale for semiquantitative estimation of intravascular gas bubbles observed in ultrasonic images. The scale is non-linear. To make a tool for evaluating and comparing decompression tables, we wanted to find the correlation between observed bubble grade and decompression illness (DCI) incidence. METHODS: The grading scale has 6 levels, defined as: 0 - no bubbles, 1 - an occasional bubble, 2 - at least one bubble every 4th heart cycle, 3 - at least one bubble each heart cycle, 4 - at least 1 bubble per cm2, 5 - bubbles causing frequent distortion of image, white-out. We have used the grading code for evaluation of 156 experimental air dives, including both dives with surface decompression using oxygen and dives with staged decompression using heliox and oxygen. We then looked at the correlation between maximum observed bubble grade and the DCI incidence. RESULTS: Max. bubble grade:Number of dives:Divers treated for DCI:DCI incidence [percent] 0:66:0:0 1:28:0:0 2:24:2:8 3:33:6:18 4:5:4:80 5:0:-: CONCLUSION: The obtained results show a strong and unambiguous correlation between the maximum observed bubble grade and the DCI incidence. The information can be used to calculate the DCI risk of a table based on a relatively small number of dives. This calculated DCI risk can be considered a tool for comparing the safety of different decompression tables where ultrasonic scanning data are available.
Description: Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org )
URI: http://archive.rubicon-foundation.org/543
Date: 1996

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

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