An implantable cardiac monitor is arranged for detecting both arrhythmias and ischemia of the human heart. The monitor includes subcutaneous electrodes for establishing electrical contact with the heart and a sense amplifier coupled to each electrode for generating an electrocardiogram of a heart beat...http://www.google.es/patents/US5313953?utm_source=gb-gplus-sharePatente US5313953 - Implantable cardiac patient monitor
