Background
The cardiopulmonary arrest (CA) is a critical situation, where ultrasound is the only diagnostic mode with the possibility of direct action during cardiopulmonary resuscitation (CR) in real time, without interfering with the resuscitation maneuvers. Through a structured process with a focused ultrasound (US) examination procedure conforming to the universal algorithm in cardiopulmonary resucitation, and using the Protocol FEER, it is possible to recognize the relevant pathology and more user-friendly wich cause CA or pulseless electrical activity.