The Impact of a Beach Chair Position During Shoulder Arthroscopy on Regional Cerebral Oxygen Saturation : Comparison of Interscalene Block and General Anesthesia

The participants of the study are patients scheduled for elective shoulder athroscopy. The patients randomise themselves by choosing the type of anesthesia technique (general anesthesia or interscalene block) after detailed description of both techniques. They receive the standard, routine medical care (monitoring and anesthesia techniques) during which the obtained data of arterial pressure, heart rate, peripheral and cerebral oxygen saturation will be statistically analysed and compared.