In order to avoid a sudden cardiac death by a fatal arrhythmia, various living body information for generating a signal which shows a level of an autonomic tone is detected by a sensor or a VT/VF risk event is detected so as to control the stimulation of the vagus nerve or the nerve stimulation waveform....http://www.google.de/patents/US20040215289?utm_source=gb-gplus-sharePatent US20040215289 - Heart treatment equipment and method for preventing fatal arrhythmia
