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q_____________? - sarim
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10-24-2011, 04:45 PM
A diver working at five times normal atmospheric pressure breaths a mixture of 50% helium and 50% O2 for four hours.Even before he begins to surface,he may encounter which of the following problems ?
A-Bends B-N2 necrosis C-Pneumothorax D-O2 toxicity
10-24-2011, 05:29 PM
I believe the oxygen content in the mixture used has to be less than 21% - is that right?.
This is because at 5 times AP more oxygen will be delivered to the tissues than in normal AP.......
10-24-2011, 09:21 PM
"D' is right
 -There is no N2 in the gas mixture he is breathing...... so no question of having N2 necrosis or Bends. -Helium is less soluble gas than N2, so less gas is dissolved in the body fluids and there for on decompression, less tendency to form emboli. |
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