# Is sudden cardiac arrest the same as a heart attack? Canonical page: https://clinicsjo.com/en/faq/sudden-cardiac-arrest-vs-heart-attack-difference Language: en Category: cardiology Publisher: ClinicsJo Published: 2026-09-13T08:09:53.125Z Content updated: 2026-09-13T08:09:53.125Z Translation (ar): https://clinicsjo.com/ar/faq/sudden-cardiac-arrest-vs-heart-attack-difference Although the terms sudden cardiac arrest and heart attack are often used interchangeably, they are two distinct medical conditions, each with different causes and mechanisms. Understanding the difference between them is vital for recognizing symptoms and taking correct action in medical emergencies. ## What is sudden cardiac arrest? Sudden cardiac arrest (SCA) is a condition in which the heart suddenly stops beating effectively. This occurs when the heart's electrical system malfunctions, leading to irregular heartbeats (arrhythmia), such as ventricular fibrillation, where the lower chambers of the heart quiver instead of beating regularly. When the heart stops pumping, blood flow to the brain and other vital organs ceases, leading to loss of consciousness and death within minutes if not treated immediately [\[1\]](). Sudden cardiac arrest is a medical emergency that requires an immediate electric shock using a defibrillator to restore the heart's normal rhythm, as well as cardiopulmonary resuscitation (CPR) to maintain blood flow to the brain and other organs until medical help arrives [\[1\]](). ## What is a heart attack? A heart attack, or myocardial infarction, occurs when blood flow to a part of the heart muscle is blocked. This blockage is usually caused by the buildup of fatty deposits (plaque) in the coronary arteries that supply the heart with oxygen-rich blood. When these plaques rupture, a blood clot forms and blocks the artery, preventing blood from reaching part of the heart muscle. If blood flow is not restored quickly, the affected part of the heart muscle begins to die [\[2\]](). During a heart attack, the heart usually continues to beat, although its pumping ability may be impaired. A heart attack can cause damage to the heart muscle, and in some cases, it may lead to sudden cardiac arrest due to damage to the heart's electrical system [\[1\]](). ## Key differences - **Underlying cause:** Sudden cardiac arrest is an electrical problem in the heart that causes it to stop beating [\[1\]](). A heart attack is a circulatory problem, where blood flow to a part of the heart muscle is blocked [\[2\]](). - **Mechanism:** In sudden cardiac arrest, the heart stops pumping suddenly. In a heart attack, the heart continues to pump, but a portion of it does not receive enough blood [\[1\]](). - **Initial symptoms:** The first sign of sudden cardiac arrest is usually sudden loss of consciousness [\[1\]](). Heart attack symptoms may include chest pain, shortness of breath, nausea, or dizziness, and these symptoms may appear an hour before sudden cardiac arrest in some cases [\[2\]](). - **Immediate intervention:** Sudden cardiac arrest requires CPR and the use of an automated external defibrillator (AED) immediately [\[1\]](). A heart attack requires medical intervention to reopen the blocked artery, such as cardiac catheterization [\[3\]](). ## The importance of immediate assistance Regardless of the condition, both sudden cardiac arrest and heart attack are medical emergencies requiring immediate attention. If you see someone suddenly collapse, lose consciousness, and become unresponsive, call emergency services immediately and begin CPR if you are trained, or perform hands-only CPR by pushing hard and fast on the center of the chest until help arrives. If an automated external defibrillator (AED) is available, use it immediately, as it can save a life by resetting the heart's electrical rhythm [\[1\]](). For more information on this topic, you can visit [Sudden Cardiac Arrest: Causes, Warning Signs, and the Importance of Immediate First Aid (Arabic)](). ## Medical references - [Sudden Cardiac Arrest]() - [Cardiac arrest]() - [Heart Treatments Heart Treatments]() General health education; not a substitute for individualized clinical assessment. Citation URL: https://clinicsjo.com/en/faq/sudden-cardiac-arrest-vs-heart-attack-difference#answer