[Diagnosis and evaluation of chronic respiratory insufficiency].

Chronic respiratory failure is defined by the inability of the respiratory system to carry out the gas exchange needed to fulfill the body needs. Its diagnosis is based on arterial blood gas measurements. It is possible, however, for the physician to assume it from clinical symptoms. Measuring peak expiratory flow allows one to evaluate the degree of insufficiency. The pneumologist confirms the diagnosis with arterial blood gases measurement and determines its severity. Exercise tests evaluate the incapacity. A quality of life questionnaire assesses the respiratory handicap resulting from the patient's life comfort deficit. After diagnosis, the respiratory failure follow-up is performed by the general practitioner, with specialized investigations as often as necessary according to the severity of the respiratory failure.