Accession Number : AD0708426

Title :   HYPERBARIC DECOMPRESSION BY MEANS OF BUBBLE DETECTION.

Descriptive Note : Technical rept. 1 May 69-30 Apr 70,

Corporate Author : VIRGINIA MASON RESEARCH CENTER SEATTLE WASH

Personal Author(s) : Smith,Kent H. ; Johanson,David

Report Date : 01 JUN 1970

Pagination or Media Count : 93

Abstract : The Doppler ultrasonic bubble detector was used to examine decompression related bubble formation in domestic sheep. A 4-channel Doppler system using cuff-type ultrasonic probes was developed for this project. These probes were then implanted on the anterior vena cava, pulmonary artery, posterior vena cava, and the femoral vein. They demonstrated bubbles to appear in the above order following decompression insult. From information obtained, theoretical surface tissue gas supersaturation values (M) were calculated for a 9 compartment model with half-times ranging from 5 to 240 minutes. Doppler indices of decompression sickness in animals appeared identical to changes observed from visible bubbles in physical systems. These indices continued to be present in some experimental animals greater than 72 hours after decompression insult. The Doppler system appeared to be a safe, applicable and accurate means of detecting decompression sickness prior to the onset of clinically observable signs. (Author)

Descriptors :   (*DECOMPRESSION SICKNESS, DETECTION), (*DOPPLER SYSTEMS, DECOMPRESSION SICKNESS), PROBES, BUBBLES, DETECTORS, NITROGEN, BLOOD VESSELS, INSTRUMENTATION, ANIMALS, STRESS(PHYSIOLOGY)

Subject Categories : Biomedical Instrumentation and Bioengineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE