Neurological Outcome After Minimal Invasive Coronary Artery Bypass Graft

Inclusion Criteria: * Minimum age of 18 * Elective Endo-CABG procedure (group 1) * Elective PCI procedure (group 2) * Elective healthy volunteer Exclusion Criteria: * Medical history of: * Postoperative cognitive dysfunction, delirium or cerebrovascular accident * symptomatic carotid artery disease * Dementia * Renal dysfunction: glomular filtration rate (GFR) \< 30 ml/min * Hepatic dysfunction: serum glutamic-oxaloacetic transaminase (SGOT)/ aspartate aminotransferase (AST), or serum glutamic-pyruvic transaminase (SGPT)/ alanine aminotransferase (ALT), more than three timer higher than normal limits * History of medication and alcohol abuse * Language barrier or incapability to communicate * Physical condition making participation impossible * Participation in other clinical trials of a drug or medical instrument * Surgical revision or intra-operative major cardial event (Endo-CABG group) * Conversion to cardiac surgery or intra-operative major event (PCI group)