Flow therapy system

A method for providing respiratory support to a patient, the method comprising:

• providing a first gas flow therapy to the patient through a non-sealing patient interface prior to administration of an anesthetic agent;
• providing a second gas flow therapy to the patient through the non-sealing patient interface during or after administration of the anesthetic agent;
• wherein the second gas flow therapy is different to the first gas flow therapy;
• and
• during the second gas flow therapy, controlling a parameter of the second gas flow therapy in response to an input relating to a characteristic of the patient.