... include paracentesis (sticking a needle into the eye and withdrawing fluid), breathing a mixture of carbon dioxide and oxygen gas, and eye massage. All are designed to restore blood flow, but none works well. TPA is typically used to treat stroke ...

... Two bacteria-detection machines, by Pall Corp. and BioMerieux. The machines measure either carbon dioxide or oxygen, gas levels that indicate how many bacteria are present in a platelet sample. The bacteria detectors so far are only for ...