Final answer:
The nurse's priority intervention while waiting for the defibrillator to arrive is to initiate cardiopulmonary resuscitation (CPR). This involves performing chest compressions and rescue breathing to provide oxygen to the brain and vital organs.
Step-by-step explanation:
The nurse's priority intervention while waiting for the defibrillator to arrive is to initiate cardiopulmonary resuscitation (CPR). CPR involves performing chest compressions and rescue breathing to provide oxygen to the brain and other vital organs until the defibrillator can be used to restore a normal heart rhythm. This intervention is crucial in order to maintain blood flow and oxygenation, which can increase the chances of a successful defibrillation.