Sudden Cardiac Arrest (SCA) and Sudden Cardiac Death (SDA) refer to the sudden cessation of cardiac activity with hemodynamic collapse.
If an intervention (eg: defibrillation) restores circulation, the event is referred to as SCA. If uncorrected, an SCA event leads to death and is then referred to as SCD.
Epidemiology of SCD
Accounts for 10-15% of natural deaths and 60% deaths from cardiac causes
Bimodal age distribution with peaks between birth and 6 months of age & after 65 years of age
Male preponderance
May be the first presentation of cardiovascular disease in 25% of patients
General patterns of heightened risk during the morning hours, on Mondays and during the winter months have been described
SCA is not random event. Most victims do have heart disease or other heath problems, often without being aware of it.
As many as 75% of people who die of SCA show signs of a previous heart attack. 80% percent have signs of coronary artery disease.
Approximately 92% of those who experience SCA do not survive.
SCA kills more than 1,000 people a day, or one person every second.
Epidemiology of SCD
Survivor of sudden cardiac arrest
Patients with low heart pumping function (less than 35%)
Post heart attack patients
Patients with documented ventricular tachycardia
History of sudden death or heart disease in family
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