Patient specific auto-flowrate control

A method for providing respiratory support using a respiratory assistance system during a medical procedure including administration of anesthesia, said method comprising:

• during the medical procedure including administration of anesthesia to a patient:
• providing a gas flow at an operating flow rate to the patient via a patient interface, wherein the patient interface comprises an unsealed patient interface, and wherein the operating flow rate is at least 20 L/min;
• applying a plurality of test flow rate values in a range as the operating flow rate, wherein the plurality of test flow rate values are at least 20 L/min;
• measuring at least one patient parameter corresponding to each of the plurality of test flow rate values;
• determining a new flow rate value based at least in part on the at least one patient parameter, wherein the new flow rate is at least 20 L/min;
• and
• providing an output relating to changing the operating flow rate based on the new flow rate,
• wherein the at least one patient parameter comprises a CO2 indicator measured by capnography.