HEART ATTACK Cause: An occlusion or blockage in an artery that supplies blood to the heart - typically the coronary artery. Once the artery is blocked the heart muscle dies as a result of oxygen deprivation, resulting in a heart attack Warning Signs: Chest and arm pain, upper abdomen and jaw pain also common, sweating, weakness, dizziness, nausea, vomiting are all common symptoms Patient Response: Usually remains conscious and alert, usually distressed and anxious. Survival Prospects: Generally good, with appropriate treatment SUDDEN CARDIAC ARREST Cause: An abnormal or irregular heart rhythm (cardiac arrhythmias) occurs. Instead of the heart beating in a coordinated fashion, the ventricles (lower chambers) quiver or wobble - a process known as ventricular fibrillation, resulting in a cardiac arrest Warning Signs: Sudden collapse, usually no detectable pulse Patient Response: Unconscious and totally unresponsive, usually no pulse, and not breathing Survival Prospects: Generally poor 90+% will die unless CPR and defibrillation is administered within 10 minutes of collapse. Some people simply don't respond to treatment because of underlying medical conditions