Amplitude Spectrum Area-Based Defibrillation Decision During Pre-Hospital Cardiopulmonary Resuscitation In Lombardia, Italy  Giuseppe Ristagno, Carla Fornari, Francesca Fumagalli, Andrea Finzi, Tommaso Mauri,Roberto Latini, Gianpiera Rossi, Giancarlo Cesana, Antonio Pesenti, on the behalf of the AREU research group, Milan, Italy