How is epidemiology of cardiac death causes?

Asystole is most common mechanism recorded at initial contact (45% of cases), pulseless electrical activity (20%), VF (25%) Acute low CO state can present clinically as cardiac arrest (massive acute pulmonary embolus, internal blood loss due to aneurysm rupture, intense anaphylaxis, cardiac rupture with tamponade Most common cause of sudden natural death are cardiac disorders In young people, SCD occurs 1 in 100,000, peak age 45-75: 1-2 in 1000