An account is given of lesions in organs caused by diagnostic and/or therapeutic operations. First possible damages during reanimation in acute life threatenig diseases are described. Secondly indirect damages resulting from resuscitation are discussed, especially reanimation-caused encephalopathies. The predominantly quantitative variations of primary diseases and secondary diseases which can arise during intensivetherapy and during so called vita reducta, as well as damages caused by necessary and, as a rule, frequently repeated medical actions are mentioned...