1. CPR is performed when a patient's heart stops beating to maintain blood flow until medical help arrives. It involves chest compressions and ventilations.
2. During a code blue, nurses play important roles such as performing chest compressions, operating emergency equipment, managing the airway, defibrillating, documenting, and leading the resuscitation efforts.
3. Effective CPR involves high-quality chest compressions, use of an AED/defibrillator, bag-mask ventilation, and coordination among the code blue team to maximize the patient's chances of survival.