[abstract] TRANSCUTANEOUS DETECTION OF ARTERIAL MICROBUBBLES USING DOPPLER.

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[abstract] TRANSCUTANEOUS DETECTION OF ARTERIAL MICROBUBBLES USING DOPPLER.

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Title: [abstract] TRANSCUTANEOUS DETECTION OF ARTERIAL MICROBUBBLES USING DOPPLER.
Author: Butler, BD; Hills, BA
Abstract: Calibrated microbubbles (40-300 micrometer) have been detected transcutaneously in the small arteries of the dog by a commercial (Sonicaid) Doppler probe recently modified to operate at 8MHz. Microbubbles were produced and calibrated with a Coulter counter using techniques similar to those described by Grulke et al. (1973). Microbubbles were injected into the descending aorta through the proximal opening of a triple-lumen Swan-Ganz catheter. Injections were controlled with a Harvard infusion pump at a pressure and rate allowing the bubbles to be picked up by the descending blood flow towards the pelvic limb. The Doppler probe was first positioned (transcutaneously) over the left femoral artery then extended laterally over the popliteal and caudal femoral artery branches. Distinct Doppler signals were recorded on a Gould strip chart recorder from vessels less than 1 mm in diameter. Repeated injections eliminated the signals from small vessels indicating possible congestion of the systemic capillaries. A comparison was made between the 8 MHz probe and a 2.2 MHz probe. The 2.2 MHz probe failed to detect microbubbles from the smaller vessels and the signal from the larger arteries was less distinct. It is felt that this demonstration of the ease of transcutaneous detection of microbubbles in the arterial system greatly enhances the benefits derived from Doppler monitoring of divers - particularly, if intra-arterial bubbles are responsible for the neurological forms of decompression sickness.
Description: Abstract of the Undersea and Hyperbaric Medical Society, Inc. Annual Scientific Meeting held April 28-May 1, 1978. Washington Plaza Hotel, Seattle, Washington (http://www.uhms.org)
URI: http://archive.rubicon-foundation.org/4113
Date: 1978

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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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