The girl is on the ICU after an allergic reaction. Doctors monitor her heart, but she appears to have recovered. She suddenly begins to feel thoughtfulness in her chest and she struggles to breathe. Nobody hears her moans and her breathing becomes more and more labored. A doctor, attracted by the noise coming from the room, enters and realizes the situation, but it is already critical. In a short time the girl goes into cardiac arrest. The doctor begins with compressions, Ambu, and various defibrillation cycles. Compression is getting stronger. After several cycles, her heart starts beating and her breathing returns to normal. Eventually, the heartbeat is also regularized.