A woman experienced a cardiac arrest during the Chalonnes-sur-Loire half marathon, which took place near Angers in the department of Maine-et-Loire on Sunday, September 27. A cardiac arrest occurs when the heart suddenly stops beating, which can be life-threatening if not treated quickly. The event, which attracts runners from across the region, is a popular local attraction. The woman's condition was critical, but immediate action was taken by those around her. A professional firefighter who was participating in the race provided first aid, including cardiopulmonary resuscitation (CPR), before emergency services arrived on the scene. Emergency responders are trained to handle such situations and work swiftly to stabilize patients. The firefighter’s quick response likely played a crucial role in the woman’s chances of survival. CPR is a life-saving technique that helps maintain blood flow to the brain and other vital organs until more advanced medical care can be provided. The incident highlights the importance of having trained individuals present at large public events. Many races and marathons now include medical personnel and first aid stations to respond to emergencies. The firefighter’s actions demonstrate how preparedness and quick thinking can make a significant difference in critical moments.