Following cardiac arrest at home during a training session, Mary is transported to the emergency room. Doctors start monitoring her vital functions, but as soon as they turn on the heart monitor, her heart goes into fibrillation and cardiac arrest. The two rescuers thus begin to fight to save her life. They begin several cycles of deep compressions and cycles with the AMBU, but they don't get any results, so they decide to dump the defibrillator on her chest. After several shocks the girl goes into asystole. More compressions will be needed for her heart to return to a shockable rhythm. Resuscitation maneuvers continue for endless minutes, with increasingly stronger cycles of chest compressions, defibrillations and AMBU bagging. After numerous attempts, Mary's heart starts beating again. Chest compressions, strong reactions to the defibrillator, AMBU. Various camera angles. Topless only