A cardiac monitoring and defibrillation system is provided which may be embodied as a bedside unit or as an ambulatory unit. The system includes amplification and processing circuitry which receives and conditions inputs from a variety of sensing means such as an electrocardiogram, a blood oxygenation...http://www.google.de/patents/US5474574?utm_source=gb-gplus-sharePatent US5474574 - Automatic external cardioverter/defibrillator
