A heart attack can lead to a cardiac arrest, when your heart stops pumping blood around your body.
If you suffer cardiac arrest you will become unconscious, and without immediate CPR (chest compressions and rescue breaths), you will die.
In a cardiac emergency, a defibrillator which delivers a high energy electric shock to restore rhythm to your heart can save your life.
The most common cardiac arrest symptoms are sudden collapse, no pulse, no breathing and loss of consciousness.
Cardiac arrest symptoms are immediate and drastic. Other symptoms include fatigue, fainting, blackouts, dizziness, chest pain, shortness of breath, weakness, palpitations or vomiting.
Cardiac arrest often occurs with no warning.
The most common heart attack symptom is chest pain or discomfort.
Other heart attack symptoms can include pain or discomfort in one or of their both arms, their back, neck, jaw or stomach. They may also experience shortness of breath with or without chest discomfort.
Other signs may include breaking out in a cold sweat, nausea or lightheadedness.