Nitrogen, CO2, you name it.
Dr. Grumpy: "Let me get an MRI form... Are you claustrophobic?"Mr. Lung: "No, but I need to breathe during the test. There's air and oxygen and all for me in there, right?"
Source: Doctor Grumpy in the House - Category: Neurologists Authors: Grumpy, M.D. Source Type: blogs
More News: Neurologists