[abstract] ECHOCARDIOGRAPHIC AND AUDIBLE DOPPLER SURVEILLANCE OF VENOUS GAS EMBOLI IN COMPRESSED AIR DIVERS.

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[abstract] ECHOCARDIOGRAPHIC AND AUDIBLE DOPPLER SURVEILLANCE OF VENOUS GAS EMBOLI IN COMPRESSED AIR DIVERS.

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Title: [abstract] ECHOCARDIOGRAPHIC AND AUDIBLE DOPPLER SURVEILLANCE OF VENOUS GAS EMBOLI IN COMPRESSED AIR DIVERS.
Author: Fife, CE; Thandroyen, F; Toole, T III; Schroth, G; Dunford, RD; Laasko, B; Sutton, T
Abstract: BACKGROUND: Audible Doppler surveillance allows quantification of venous gas emboli (VGE) resulting from decompression, but is limited by its subjectivity. Transthoracic 2-D Doppler echocardiography (TTE) however, allows visual confirmation of intracardiac bubbles. The objective of this study was to compare the efficacy of TTE with audible Doppler surveillance following a 170 fsw dive. METHODS: Eleven healthy male volunteers 24 to 46 years of age underwent a simulated compressed air hyperbaric exposure according to a profile known to produce significant VGE with a low risk of decompression illness. A pre-dive baseline and post-dive serial audible Doppler assessments were performed by expert listeners, alternating with visual transthoracic 2-D Doppler echocardiographic surveillance. RESULTS: Doppler VGE were documented in 81% (9/11) of subjects post-dive; maximum bubble grades from any site, according to Kisman-Masurel Codes, utilizing DCIEM procedures, were I (n=5), II (n=2), and III (n=2). TTE examination revealed VGE in 90% of subjects (10/11). The data are summarized below. The subject with no visual VGE on TTE also had a Doppler grade of 0. Doppler was positive in 90% (9/10) of subjects with visualized VGE. Intracardiac bubbles were visualized in 2 subjects with negative precordial (PC) but positive subclavian (SC) VGE. CONCLUSION: Subclavian Doppler surveillance seems to increase Doppler sensitivity. TTE was more efficacious than audible Doppler for intracardiac bubble detection, however, the Doppler procedure utilized (PC + SC) compared favorably with TTE in this small sample. [table] Neg Precordial (Pos SC), No Audible (Neg PC and Neg SC); Pos TTE (10): 2/10, 1/10; Neg TTE (1): Yes, Yes [end table]
Description: Abstract of the Undersea and Hyperbaric Medical Society, Inc. Annual Scientific Meeting held July 7-10, 1993. World Trade and Convention Centre, Halifax, Nova Scotia, Canada. (http://www.uhms.org)
URI: http://archive.rubicon-foundation.org/8209
Date: 1993

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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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