[abstract] PULMONARY VASCULAR FILTRATION THRESHOLD FOR VENOUS AIR BUBBLES: CONCEPTS AND LIMITATIONS.

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[abstract] PULMONARY VASCULAR FILTRATION THRESHOLD FOR VENOUS AIR BUBBLES: CONCEPTS AND LIMITATIONS.

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Title: [abstract] PULMONARY VASCULAR FILTRATION THRESHOLD FOR VENOUS AIR BUBBLES: CONCEPTS AND LIMITATIONS.
Author: Butler, BD; Garvey, EP; Hills, BA
Abstract: Venous air bubbles are commonly detected by Doppler following decompression. Usually there are no symptoms associated with these bubbles, yet there have been many attempts -with varying degrees of success -to correlate bubble ranking systems with overt symptoms of decompression sickness (DCS). This applies to both Type I and II DCS. These studies have been limited to empirical observation derived from ultrasonic Doppler recorders. High bubble scores, however, may be used for predicting cerebral involvement; although little quantitative data exists to support this claim. We have examined the pulmonary vascular filtration threshold for the transposition of venous bubbles into the arterial circulation under normal conditions, following the administration of vasoactive drugs and in open chest conditions using a canine model. Air was infused into the right atrium at rates ranging from 0.05 ml/kg/min. to 0.40 ml/kg/min. with Doppler probes placed over the femoral, carotid and/or abdominal aorta. The pulmonary vascular filtration threshold, or spillover volume, for venous bubbles was 0.35 ml/kg/min for normal condition and below 0.20 for the open chest group. Hemodynamic responses showed increases in pulmonary artery pressure and pulmonary vascular resistance and decreases in blood pressure and cardiac output. The concept of a pulmonary vascular filtration threshold is useful in predicting a severe case of DCS with possible cerebral vascular involvement. The correlation of the quantitative data obtained in this study with Doppler data used for bubble scores provides a better basis for predicting Type II DCS.
Description: Abstract of the Undersea and Hyperbaric Medical Society, Inc. Annual Scientific Meeting held May 29-June 2, 1984. The Gunter Hotel, San Antonio, Texas (http://www.uhms.org)
URI: http://archive.rubicon-foundation.org/5339
Date: 1984

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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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