Circulatory arrest is a medical emergency that must be restored to circulation quickly. Prolonged circulatory arrest will cause irreversible brain damage, which can cause sequelae after restoring circulation. Along with chest compressions, airway clearance, breathing, the use of adrenaline in emergency circulatory arrest is very important.

Food intolerance is a general term used to describe a wide range of adverse reactions to foods, including allergic reactions, adverse reactions due to enzyme deficiencies, pharmacological reactions, and other unspecified reactions.

Intravenous injection is one of the basic injection techniques and is commonly used in medicine today. This technique has the advantage of delivering the drug directly into the circulatory system, helping the drug's effects to take effect quickly. However, intravenous injection is not always possible.