The purpose of this prospective, observational study is to assess the feasibility of patient-controlled sedation (PCS) for implantation of subcutaneous venous ports (SVP).

The main objective of this trial is to study the feasibility of (PCS) with propofol and alfentanil during SVP implantation.

Participants included in the study are able to administer a combination of propofol and alfentanil using a patient-controlled sedation pump. This allows the patient to self-control their sedation/analgesia during SVP implantation. The pump enables the patient via a hand-held button to trigger the release of a single bolus. A bolus of 0.5ml programmed into the pump contains a combination of 4.5mg propofol and 25µg alfentanil and is administered under a 7 second period resulting in a maximal amount of 8 bolus doses per minute.

Each SVP implantation procedure is separated into four time points at which sedation scores are recorded. Patients are monitored by anaesthesia staff and SVP implantation is performed by an anaesthesiologist according to hospital protocol.

Participants are asked to fill in a written questionnaire to indicate pain score and satisfaction with the procedure when ready for discharge.

Adverse events, time consumption and operators satisfaction with implantation conditions are recorded periprocedural.

The result of this trial will provide guidance for a larger randomized trial (PACSPI-2) comparing several clinically relevant aspects of the use of PCS and local anesthesia (LA) versus LA alone during SVP implantation.

Inclusion Criteria:

• Adult patients (≥18 years) scheduled for SVP implantation at Ryhov County Hospital.

Exclusion Criteria:

• Inability to operate the PCS apparatus,
• Inability to communicate in Scandinavian languages.
• Patients who require general anaesthesia or patients eligible for local anaesthesia only (i.e. severe sleep apnea).
• Propofol or alfentanil allergy.
• Intake of food (or clear fluids) within six (or two) hours prior to the procedure.
• Failure to achieve peripheral vascular access.
• Pregnancy

Adult patients ≥18 years scheduled for SVP implantation at Ryhov County Hospital.

All IPD that underlie results in a publication will be available for sharing on request.

The supporting information will be available from november 2020 until 6 months after publication

Requests for sharing IPD that underlie results in a publication can be made to the principal investigator.

The supporting information will be available on researchgate.net during the described time frame.