Here's another study that I found interesting. http://www.ncbi.nlm.nih.gov/pubmed/22465807
What with all the sturm und drang (read: hoopla) about ET tubes and such, it seems that in porcine models in V-fib arrest with CPR in progress, placing a supraglottic airway significantly decreases the amount of carotid blood flow. That is, I think, really bad. Do you think this will have any ramifications on EMS practice? I doubt it. After all we found out back in 1978 that buccal glucose doesn't work but that didn't stop anybody.