Operations will be performed in local or general anaesthesia either on an outpatient basis or via 24h-admission. Changes of technique due to catheter implantation failure, operation time and intraoperative complications will be assessed during the procedure. Postoperative examination will be standardized in both groups, i.e. chest radiography (to confirm catheter placement and to exclude pneumothorax) as well as final clinical examination at discharge or before patient transfer.