I am not sure what your standards are but over here in Canada and in Ontario we follow the BLS patient care standards. Trendellenburg does work I am not sure what studies say it does not but it does work to bring up a pt's BP. When you have a hypovelimic pt it is one of the only things you can do to elevate BP. This procedure has been around for years and would not have been if it did not work to some degree. I agree it is not the best method but if you don't have any other options you need to do something. The pt does not always read the book. Scientifically proven or not proven studies are not always right that is why medicine is called a practice.