What is the concept of cardiopulmonary resuscitation (CPR)?

CPR is a set of techniques applied to a patient in cardiorespiratory arrest.
The objective of CPR is to provide support and restore effective oxygenation, ventilation, and circulation to prevent neurological function sequelae.
The Advanced Life Support (ALS) group requires advanced maneuvers such as defibrillation, cardiac stimulating drugs, and advanced airway management.
The Basic Life Support (BLS) group does not include advanced airway devices or drug administration.