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Sudden cardiac arrest is a leading cause of death world wide, with about 100.000 to 150.000 cases each year in Germany alone [Weidringer and Sefrin, 2006]. This means that annually one out of 1000 citizens are affected [Bahr, 2007]. At standard conditions the human brain has a relative low ischemic1 tolerance. Therefore after 3 - 5 minutes without therapy, irreversible damage is to be expected. The rate of survival drops 7% - 10% each minute, without resuscitation [Bahr, 2007]. Since the arrival of the organized emergency medical service usually takes more than 5 minutes after the emergency call [Wahlen et al., 2003, Weisfeldt et al., 2010], the instant and adequate resuscitation by bystanders in this period is of vital importance. The advantage of basic life support2 (BLS) by laymen shows a fourfold higher rate of survival, once resuscitation has begun, until the arrival of the emergency medical service [Bahr, 2007].