Phrenic nerve stimulation is a neurostimulation technique that allows patients who are dependent on external mechanical ventilatory support to regain their breathing autonomy. This study aim at long term following of patients who may be candidates for permanent implanted phrenic nerve stimulator.

During 10 years, the study will be conduct to obtain the quality of life evolution and medical complications in patients candidates but not implanted, and in patients candidates then implanted with the phrenic nerve stimulator.

Inclusion Criteria:

• Patients with central respiratory paralysis (medullary lesions or supramedullary lesions, whatever their causes) or patients with congenital central hypoventilation (including Ondine syndrome by Phox2B mutation) or acquired (whatever the cause), with permanent hypoventilation or related to sleep.

Exclusion Criteria:

• Patient not affiliated to the social security system
• Patient unable to oppose his participation in research
• Patient not understanding French

Patients adressed to the Respiratory and Medical Resuscitation Unit of the Pitié-Salpêtrière Charles Foix Hospital Group for the search for an indication of SPi in the context of central ventilatory paralysis or central hypoventilation, whether or not the indication is retained at the end of the balance sheet; this population is essentially made up of adults, some but not all of whom benefit from a protection regime; it may occasionally include minors;

Patients addressed to the adult branch of the Rare Disease Reference Center for Congenital Central Venous Hypoventilation, located within the hospital group Pitié-Salpêtrière Charles Foix, for the assessment and monitoring of their disease. By definition, this population consists solely of adults.