With regard to the fields of competence of advanced practice defined by the Order of October 22, 2021 amending the Order of July 18, 2018 on the system of studies for the State diploma of advanced practice nurse mentioning renal disease, dialysis and renal transplantation (MRDT) and the latest recommendations of the French National Authority for Health (HAS) of July 1 2021 on the monitoring of patients with Chronic Kidney Disease (CKD), the Advanced Practice Nurse (APN) has its place in improving practices and the care pathway of patients suffering from end-stage chronic renal failure (CKD).

In the literature, there are a number of studies arguing the benefits of advanced practice nurse follow-up with patients suffering from chronic renal failure (CKD) in terms of improving their psycho-social and self-care skills. However, few studies, particularly in France, demonstrate its role in the coordination of care. By virtue of their training, advanced practice nurse with an disease, dialysis and renal transplantation (MRDT) specialization acquire skills in managing pretransplant assessment files and in planning the creation of arteriovenous fistula (AVF), which enable them to be autonomous and relevant professionals in the coordination of these processes. This is why it seems appropriate to look at the added value that advanced nursing practice can bring to the follow-up of these patients.

To this end, a study of the practices and social representations of healthcare professionals involved in the management of Chronic Kidney Disease (CKD) patients can allow us to - To explore current practices under the focus of follow-up by a nephrologist and an advanced nurse on access to renal transplantation and on the implementation of arteriovenous fistula (AVF) versus follow-up by a nephrologist only.

• To perceive the "reading grids" that health professionals in transplant centers assign to the management of this type of patient by an Advanced Practice Nurse (APN).
• To question the identity issues associated with the actors by taking into account their status and roles in the institution and in interdisciplinaritý.

This study should produce initial results on the changes induced by advanced nursing practice on access to care and on the improvement of complex care pathways and more particularly for the Chronic Kidney Disease (CKD) patient.

Inclusion Criteria:

• Patients starting dialysis sessions
• Patient eligible for arteriovenous fistula (AVF) and/or renal transplantation who started dialysis sessions between January 1st 2016 and December 31st 2021 at the Roanne Hospital.

Exclusion Criteria:

• Patient starting dialysis in emergency without prior nephrological followup.
• Patients who started dialysis in other dialysis centers (transfer: no knowledge of their previous nephrological follow-up)
• Patients starting dialysis at dates earlier or later than those determined in the study.
• Patients with missing data at the time of data collection.
• Patients under legal protection (guardianship, curatorship) or with cognitive impairment preventing informed consent.

Patient eligible for arteriovenous fistula (AVF) and/or renal transplantation who started dialysis sessions between January 1st 2016 and December 31st 2021 at the Roanne Hospital will be included.