[abstract] A CASE OF HIGH DOPPLER SCORES DURING ALTITUDE DECOMPRESSION IN A SUBJECT WITH A FRACTURED ARM.

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[abstract] A CASE OF HIGH DOPPLER SCORES DURING ALTITUDE DECOMPRESSION IN A SUBJECT WITH A FRACTURED ARM.

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Title: [abstract] A CASE OF HIGH DOPPLER SCORES DURING ALTITUDE DECOMPRESSION IN A SUBJECT WITH A FRACTURED ARM.
Author: Karlsson, L; Linnarson, D; Gennser, M; Blogg, SL; Lindholm, P
Abstract: BACKGROUND: The subjects participated in an experimental series with altitude decompression to simulate the protocol for extravehicular activity (EVA; “space walks”) performed by Russian cosmonauts during space flight. MATERIALS AND METHODS: The Russian pre-EVA/EVA decompression regimen was simulated in an altitude chamber. Twenty subjects were decompressed to an altitude of 7500 meter (0.38 bar) after 1 h of oxygen breathing, and continued to breathe oxygen for 2 hours (n=10) or 6 hours (n=10). Subjects were strictly supine and performed intermittent arm exercise of moderate intensity. Every 5-15 min pre-cordial Doppler ultrasound was used to monitor the subject’s heart for venous gas emboli (VGE) and the subjects were also monitored for symptoms of decompression illness. Subjects were studied in pairs with two attendants present. RESULTS: During the preceding medical examination one subject reported a tender right lower arm (the dominant side). He had had these symptoms for 19 days and also visited a physiotherapist. During the examination he showed slight right-sided weakness and it was believed at the time to be a muscle strain or tear. Five days after the experiment x-ray showed fractures in the scaphoid bone and the head of the radial bone. The subject with the broken arm had large numbers of detectable VGE (KM Doppler scores of grade III or above) after 56 minutes at altitude and at 5 occasions during the ensuring 38 minutes before recompression. The other subjects had Doppler scores of zero for at least 2 h (n=18) and for some for 6 h (n=8) (see separate report). CONCLUSIONS: This unintentional exposure of a subject with a relatively recent arm fracture to altitude decompression suggests that the local inflammatory process and/or local endothelial damage in the fractured area could be a locus of minor resistance for formation of, or entry of, decompression gas bubbles in the blood.
Description: Abstract of the Undersea and Hyperbaric Medical Society, Inc. Annual Scientific Meeting held June 14-16, 2007. Ritz-Carlton Kapalua Maui, Hawaii (http:www.uhms.org)
URI: http://archive.rubicon-foundation.org/5136
Date: 2007

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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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