Patient-Controlled Sedation in Port Implantation (PACSPI-2)

In addition to LA, patients in the study group are able to self-administer a combination of propofol and alfentanil using a patient-controlled sedation pump. The pump enables the patient via a hand-held button to trigger the release of a single bolus of 0.5ml containing 4.5mg propofol and 25µg alfentanil under an 10second period. This results in a maximal possible amount of 6 bolus doses per minute.