Which of the following statements is/are correct regarding cardiopulmonar resuscitation?:
a) Cardiac arrest is the number one cause of prehospital deaths.
b) Ambulances having 12-lead ECGs can decrease the time until treatment of thrombolytic candidates.
c) Achieving coronary perfusion pressure (CPP) above 15 mmHg may restore spontaneous circulation.
d) Chest pain is the most common complaint in an impending cardiac arrest.
