Table 1 List of questions used during the semi directive interview

• What is your experience of venipuncture or needle change on central catheter?

• What did you feel when you make a venipuncture or a needle change on central catheter?

• How did you feel when you encountered difficulties in a venipuncture or a needle change on central catheter?

• How do you feel when the patient expresses pain in a venipuncture or a needle change on central catheter?

• How do you perceive your role as a nurse for the prevention of induced pain during venipuncture or needle change on central catheter?

• Could you specify the nursing actions (venipuncture or needle change on central catheter) in which it is necessary to conduct pain prophylaxis?

• Are there any situations where pain prophylaxis is complicated (feasibility, time, technology)?

• Are there situations where the patient refuses pain prophylaxis?

• How many venipunctures do you do during one week? How often do you perform pain prophylaxis?

• How many needle changes on central catheter do you make during one week? How often do you perform pain prophylaxis?

• Is there something you would like to add?