Heart attack and cardiac arrest are two terms that are often used interchangeably, but they refer to different medical conditions. A heart attack occurs when blood flow to a part of the heart is blocked, usually by a clot in a coronary artery. This can damage the heart muscle. In contrast, cardiac arrest is when the heart suddenly stops beating, leading to loss of consciousness and breathing. These are distinct conditions that require different responses and treatments. A heart attack is typically caused by a blockage in one of the coronary arteries, which supply blood to the heart muscle. This blockage can result from a buildup of plaque in the artery walls, which may rupture and form a clot. Symptoms of a heart attack may include chest pain or discomfort, shortness of breath, and nausea. It is a medical emergency that requires immediate treatment to restore blood flow to the heart. Cardiac arrest, on the other hand, is not directly caused by a blockage in the coronary arteries but rather by an electrical malfunction in the heart that causes it to stop beating. This can be triggered by a heart attack, but it can also occur due to other factors such as severe heart disease, trauma, or an underlying medical condition. Symptoms of cardiac arrest include sudden collapse, loss of consciousness, and absence of breathing. Immediate action, such as cardiopulmonary resuscitation (CPR) and the use of an automated external defibrillator (AED), is crucial for survival. Hervé Douard, a former cardiologist at the University Hospital Center of Bordeaux and vice-president of the French Federation of Cardiology, emphasizes the importance of understanding the difference between these two conditions. Recognizing the signs and knowing the appropriate response can be life-saving. Awareness and education are key to improving outcomes for both heart attack and cardiac arrest patients.