The article presents most important changes in international guidelines for adult cardiopulmonary resuscitation. In this article guideline changes in basic and advanced life support published in Guidelines 2000 for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care--a Consensus on Science are discussed. Major changes in guidelines presented in this article include: pulse check, ventilation technique for rescue breathing, compression technique, abdominal thrust recommendations, precordial thump, universal algorithm changes.