66) OXYGEN CAUSES

[Editor]

a) convulsions
b) damage to alveolar capillaries
c) the prevention of dissolved nitrogen in the blood to diffuse into the alveolus
d) air bubbles in peripheral tissue
e) atelectasis with prolonged exposure

[Editor]

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Oxygen can cause convulsions at above 2-3atm. Oxygen toxicity can cause endothelial damage with reduced mucus clearance and infiltration by inflammatory cells. Oxygen does not prevent dissolved N2 in blood to diffuse into the alveolus. N2 has a blood/gas solubility coefficient of 0.014. In decompression sickness, nitrogen bubbles may come out of solution following rapid passage from a high atmospheric pressure environment to one of lower atmospheric pressure. O2 therapy can cause absorption atelectasis.