The investigators will investigate the differences between the cardiac output and the cerebral blood-flow between a regional anesthesia (RA) and a general anesthesia (GA) in a randomized, controlled, single center study at the Medical University Innsbruck, Department of Anesthesia and Intensive Care Medicine.~For this purpose patients with the need of a carotid endarterectomy (CEA) will be included and randomized either to the regional anesthesia (RA) or the general anesthesia (GA) group until a patient number of 45 in each group is achieved.~The cardiac output and cerebral blood-flow via trans-cranial Doppler (TCD) will be measured at 6 time points:~T0 Baseline (after insertion of an arterial line)~T1 After induction of anesthesia, but before surgical start~T2 Two minutes after clamping the carotid artery~T3 Two minutes after shunt insertation of the carotid artery~T4 After reperfusion~T5 After completion of the skin suture
The aim of this study is to investigate the differences between the cardiac output and the cerebral blood-flow between a regional anesthesia (RA) and a general anesthesia (GA) in a randomized, controlled, single center study at the Medical University Innsbruck, Department of Anesthesia and Intensive Care Medicine.