Der Anaesthesist
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The cooperation of surgeon and anaesthetist in positioning of the patient is subject to the principles of horizontal division of labour recognized in the interdisciplinary agreement and confirmed by the legislature: anaesthetist and surgeon carry out their respective tasks independently of each other, each bearing full responsibility for their own work (principle of strict separation of functions), they tailor their procedures to fit in with each other (duty of coordination), and each is entitled to expect and rely on due care in the other (principle of trust). In the case of conflict--when the best position for the specific intervention leads to a higher anaesthesiological risk--the principle of predominance of the actual requirements applies. If no agreement is reached it is incumbent on the surgeon to make the decision; this means that the surgeon bears the medical and legal responsibility for appropriate deliberation. ⋯ The demands of jurisdiction in terms of documentation of the positioning and of presentation of evidence are practically oriented and can basically be met. The same is true of the information supplied to the patient on the risk that positioning can cause harm. The doctor is obliged to supply evidence of the patient's substantive consent and the provision of information that this implies.
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The risks and benefits of epinephrine given during cardiopulmonary resuscitation (CPR) are controversially discussed. Animal experiments revealed beta-receptor-mediated adverse effects of epinephrine such as increased myocardial oxygen consumption, ventricular arrhythmia, ventilation-perfusion defects, and cardiac failure in the postresuscitation phase. In clinical studies, high-dose vs. standard-dose epinephrine was unable to improve resuscitation success. ⋯ For CPR of adults with shock-refractory ventricular fibrillation, 40 units AVP or 1 mg epinephrine is recommended (class 2B); patients with asystole or pulseless electrical activity should be resuscitated with epinephrine. AVP is not recommended for adult cardiac arrest patients with asystole or pulseless electrical activity; or pediatric cardiac arrest patients due to a lack of clinical data. Until definitive data about AVP vs. epinephrine effects during CPR are available, the present state of knowledge should be interpreted that two vasopressors are available for use instead of one.
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This paper reviews the pathophysiological processes occurring after contact of blood with artificial surfaces during continuous haemofiltration and the predominant role of platelets in the genesis of extracorporeal thrombosis. A basic prerequisite for effective renal replacement therapy is adequate anticoagulation in order to inhibit activation of coagulation and to avoid haemofilter clotting. Antithrombotic regimens controlling plasma coagulation activation and platelet-surface interactions, as well as methods of coagulation monitoring are reviewed. ⋯ Heparinoids and hirudine are indicated in patients with heparin-induced thrombocytopenia II. In patients at risk for thromboembolism, regional citrate anticoagulation may be beneficial. Performing continuous haemofiltration without antithrombotic therapy is not recommended.