When applied with the correct pressure, cricoid pressure compresses the proximal oesophageal lumen situated between the cricoid cartilage and the cervical vertebrae (Fig 1). This occludes the lumen of the oesophagus, helping to prevent regurgitation and aspiration of gastric contents.

What is the purpose of cricoid pressure?

Cricoid pressure, also known as the Sellick manoeuvre or Sellick maneuver, is a technique used in endotracheal intubation to try to reduce the risk of regurgitation. The technique involves the application of pressure to the cricoid cartilage at the neck, thus occluding the esophagus which passes directly behind it.

How does cricoid pressure prevent aspiration?

In 1961 Sellick reported using "occlusion of the upper oesophagus by backwards pressure on the cricoid ring against the bodies of the cervical vertebrae to prevent gastric contents from reaching the pharynx" during induction of anaesthesia in patients at high risk of aspiration [2].