Interesting thing- The concept was developed by a Dr who wrapped India rubber around patients legs to perform back surgery sitting up. Then of course the military used G-suits for dive bombers to keep them concious, and they evolved during Viet Nam. Miami FD used them quite a bit in the 60' and early 70's. I used them quite a few times, back in the day. Had unconcious unresponsive trauma patients wake up and start talking. But then, they fell out of favor. I think more studies should have been done to support them than shoot them down. My " Any tool in the tool box" theory.
Hey if they don't work don't use them, if they cause further harm, don't use them. If they do work, use them.
I don't think anyone will resurect them for study. It's amazing how some "researchers" drive the entire realm of EMS. More research should be done at the local level to either support or remove a drug or tool.
I looked at crics in the early 90's. We had to change our PCR afterwards. Cric and Cervical collar were too close together on the form, and mismatced carbon copies skewed the results. Out of 63 report crics, only 22 were actually performed and 18 of those were nurses from one flight service. If further investigating had not been done, we'd have been led down the wrong path.
SOO, my point is, research is good if it's valid, accurate and the sampling numbers are sufficient to make it so. EMS Systems should be constantly reviewing procedures and evaluating the efficacy of all their procedures, not knee jerk and follow along like sheep. There is no template for all to follow.