Doppler Detection of Silent Venous Gas Emboli in Non-Decompression Diving Involving Safety Stops

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Doppler Detection of Silent Venous Gas Emboli in Non-Decompression Diving Involving Safety Stops

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Title: Doppler Detection of Silent Venous Gas Emboli in Non-Decompression Diving Involving Safety Stops
Author: Uguccioni, DM
Abstract: Venous gas bubbles in the blood of human divers may be indicative of several incipient diving pathologies, such as decompression sickness and air embolism. the present study compared the presence of venous gas emboli in the bloodstream of human divers detected with an ultrasonic Doppler device. Two dive profiles were conducted for the study, one with direct ascent to the surface and one with a reduced rate of ascent, accomplished by making a safety stop. Doppler monitoring was conducted at 20, 40 and 60 minute intervals post-dive. Dives with safety stops showed significantly fewer venous gas emboli. Other factors, such as, depth and bottom time influenced the efficiency of safety stops. Overall, safety stops are capable of significantly reducing venous gas emboli detected by Doppler in the blood of human divers. Research was conducted in conjunction with the National Undersea Research Center/ University of North Carolina at Wilmington (NURC/UNCW) as an observational study of operational diving.
Description: MS Thesis
URI: http://archive.rubicon-foundation.org/3430
Date: 1994

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