You have arrived on the scene of a 44-year-old man in cardiac arrest. According to family, the patient has a cardiac history and was complaining of chest pain most of the morning. They state that it has been about 10 minutes since he collapsed. To maximize the patient's opportunity for a successful outcome, which one of the following is the MOST important intervention that the EMT can make

immediately?

A) Advanced drugs by paramedics
B) Defibrillation with the AED
C) Oxygen through a nonrebreather mask
D) Cardiopulmonary resuscitation

D