The heart pumps the blood which circulates throughout the body and allows oxygen to be carried to the cells of the different organs. When the heart stops, oxygen is no longer delivered and cells are quickly destroyed. In a few minutes, the consequences can be irreversible. Quickness of care (cardiopulmonary resuscitation, also known as ‘cardiac massage’, artificial ventilation) is essential to minimise the risk of damage and lessen the consequences as much as possible.