Cardiac arrest may be caused by almost any known heart condition. Most cardiac arrests occur when the diseased heart's electrical system malfunctions, producing an abnormal rhythm such as ventricular tachycardia or ventricular fibrillation. Some cardiac arrests are caused by extreme slowing of the heart's rhythm. CPR is one of the most important ways you can help someone who is depending on bystanders to know what to do in case of an emergency. Be the bystander that becomes a HERO. Contact us to get CPR certified.