Recently a friend of mine who was accepted to CRNA school had a question that went something like "your patient develops a spontaneous pneumothorax...........is it deadspace or is it a shunt". I am familar with both, but have not been able to come up with a good argument. I believe this was more of a "I dont know" type of answer they were looking for, however it had bugged me ever since. Anyone have any thoughts on it?