<qa>  What is the term for a randomized trial?Traditionally, patients who underwent thoracic surgery have been treated with a classical protocol which include; bed rest, ambulation prohibited for 24-48 hours and starvation for several postoperative days till the recovery of bowel. Some studies reported the efficacy of early rehabilitation protocols or FTR protocols in thoracic surgery to reduce postoperative complications and to minimize hospital stay. But these studies are few and retrospective. Prospective randomized trials focuses based on the fast track regimen or medical fast track that interest only on the medical component . 