==Cricoid pressure, also called Sellick's maneuver, is not always safe== 
 As all maneuvers, it has indications, contraindications and side effects. It may cause esophageal rupture and it may make tracheal intubation and mask ventilation difficult or impossible. Although many seminars and courses such as ALS (advanced life support of ERC) mention it, there is a debate on using it. See http://www.anesthesia-analgesia.org/content/109/5/1360