2 - CIBPL

Lestraumatismes
pulmonairesdel’apnéiste
DrAnneHENCKES
UnitédeMédecinehyperbare

•Lepoumon:unlieud’échangesgazeux
–Apportsd’O2
–EvacuationCO2
=>Pardiffusionàtraversdesmembranes

Labarrièrealvéolocapillaire
Finebarrièrecouvrantunesurface
de50à100m2:
0.3µmd’épaisseur
"Thesurprising thing is not
that thecapillaries fail,but
that they donotso more
often" (West)
WestJB..Lancet1992

Forcess’exerçantsurlaBAC
2
1
P
3 3
1Capillary
Capillary transmural transmural pressure pressure
3Longitudinal tension in
Longitudinal tension in
the
the alveolar alveolar wall wall
2Surface
Surface tension tension of of the the
alveolar
alveolar lining lining layer layer
2
Epithelium
Endothelium

LadéfaillancedelaBAC
WestJB..1995
Lorsquel’onélèvelaPression
transmurale