Out-of-hospital cardiac arrest

An out-of-hospital cardiac arrest occurs when the heart suddenly stops effective pumping outside a hospital setting, usually due to an electrical malfunction. This leads to an immediate loss of blood flow to the brain and other vital organs. It often happens without warning and requires urgent intervention, such as CPR and defibrillation, to restore normal heart rhythm and keep the person alive. Rapid response by bystanders and emergency services is crucial for survival and minimizing long-term complications.