sentences:  Procedures would be used soon after they are described in the literature or at conferences, with trial data determining if the procedure improves outcomes lagging behind by years due to the strict protocols and long follow-up of patients necessary to test the procedure.By the time the trials were published, they would be considered out of date, as they did not reflect the current practice in the field.This led to the inception and use of a number of procedures and devices in the interventional realm that have fallen out of practice due to their being found to not improve outcomes after formal trials have been performed.