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Titolo:
EFFECT OF AIR, HELIOX, AND OXYGEN BREATHING ON AIR BUBBLES IN AQUEOUSTISSUES IN THE RAT
Autore:
HYLDEGAARD O; MADSEN J;
Indirizzi:
UNIV COPENHAGEN,PANUM INST,DEPT MED PHYSIOL,BLEGDAMSVEJ 3 DK-2200 COPENHAGEN N DENMARK
Titolo Testata:
Undersea & hyperbaric medicine
fascicolo: 4, volume: 21, anno: 1994,
pagine: 413 - 424
SICI:
1066-2936(1994)21:4<413:EOAHAO>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPINAL DECOMPRESSION-SICKNESS; HE-O2; GASES; DIVES;
Keywords:
MUSCLE; TENDON; DIFFUSION LIMITATION; EYE; PERFUSION LIMITATION; DECOMPRESSION SICKNESS; LIMB BENDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
O. Hyldegaard e J. Madsen, "EFFECT OF AIR, HELIOX, AND OXYGEN BREATHING ON AIR BUBBLES IN AQUEOUSTISSUES IN THE RAT", Undersea & hyperbaric medicine, 21(4), 1994, pp. 413-424

Abstract

Our purpose was to examine the behavior of air bubbles in three non-lipid tissues (skeletal muscle, tendon, and the anterior chamber of theeye) during breathing of air, helium-oxygen (heliox, 80:20), or oxygen. Air bubbles were injected into skeletal muscle or tendon in rats after decompression from a l-h air exposure at 3.5 arm abs (355 kPa) or into the anterior chamber of the rat eye without any previous pressureexposure. The bubbles were studied by photomicroscopy at 1 atm abs (101 kPa) during either air breathing or during air breathing followed by heliox or O-2 breathing. Muscle: during air breathing, all bubbles initially increased in size for a period of 55-100 min after decompression and then started to shrink. Both heliox and O-2 breathing increased the shrinking rate as compared to air. Bubble size decreased more rapidly during O-2 than heliox breathing. Tendon: during air breathing, bubble size decreased at a constant rate; in one bubble the decrease was preceded by a small increase. During heliox breathing most bubbles decreased faster than during breathing of air. O-2 breathing caused a short-term increase in bubble size in 4 out of 10 bubbles. Otherwise, the shrinkage rate was increased in six bubbles and uninfluenced in four bubbles during breathing of O-2. Rat eye: during air breathing all bubbles shrank in the observation period. When heliox breathing was started, all bubbles transiently grew for 10-35 min, after which they began shrinking faster than during air breathing. When O-2 breathing wasstarted, five out of seven bubbles initially grew or stopped shrinking for 5-15 min, after which they decreased in size faster than during both air and heliox breathing. We conclude that breathing of either heliox or O-2 will cause air bubbles in aqueous tissues to disappear faster than during breathing of air. Since heliox breathing promoted bubble shrinking in both muscle and tendon, gas exchange was probably not primarily limited by extravascular diffusion in these aqueous tissues. The present experiments suggest that heliox breathing at 1 atm abs may not exacerbate limb bends.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/07/20 alle ore 07:44:20