A system for delivering a flow of breathing gas to an airway of a patient, the system comprising: a gas flow generator that generates a flow of gas; a patient circuit coupled to the gas flow generator and adapted to communicate the flow of gas to an airway of the patient; a sensor associated with the gas flow generator or the patient circuit and adapted to monitor a characteristic associated with the flow of gas; a controller adapted to determine a first characteristic based on the monitored characteristic, wherein the controller determines a target of the flow of gas to be delivered to the patient, and wherein the controller controls the delivery of the flow of gas to the airway of the patient from the gas flow generator via the patient circuit by: 1) providing a baseline positive pressure support amount to the patient, wherein the baseline positive pressure support amount comprises a pressure provided to the patient during inspiration that is higher than a pressure provided to the patient during expiration, and 2) providing a modified pressure support amount to the patient by reducing the baseline positive pressure support amount by a reducing pressure support amount to reduce the pressure provided during inspiration to less than the pressure provided during expiration if (i) the first characteristic is above the target, and (ii) the patient is experiencing a hyperneic phase of Cheyne-Stokes respiration, CSR. a gas flow generator that generates a flow of gas; a patient circuit coupled to the gas flow generator and adapted to communicate the flow of gas to an airway of the patient; a sensor associated with the gas flow generator or the patient circuit and adapted to monitor a characteristic associated with the flow of gas; a controller adapted to determine a first characteristic based on the monitored characteristic, wherein the controller determines a target of the flow of gas to be delivered to the patient, and wherein the controller controls the delivery of the flow of gas to the airway of the patient from the gas flow generator via the patient circuit by: 1) providing a baseline positive pressure support amount to the patient, wherein the baseline positive pressure support amount comprises a pressure provided to the patient during inspiration that is higher than a pressure provided to the patient during expiration, and 2) providing a modified pressure support amount to the patient by reducing the baseline positive pressure support amount by a reducing pressure support amount to reduce the pressure provided during inspiration to less than the pressure provided during expiration if (i) the first characteristic is above the target, and (ii) the patient is experiencing a hyperneic phase of Cheyne-Stokes respiration, CSR. 1) providing a baseline positive pressure support amount to the patient, wherein the baseline positive pressure support amount comprises a pressure provided to the patient during inspiration that is higher than a pressure provided to the patient during expiration, and 2) providing a modified pressure support amount to the patient by reducing the baseline positive pressure support amount by a reducing pressure support amount to reduce the pressure provided during inspiration to less than the pressure provided during expiration if (i) the first characteristic is above the target, and (ii) the patient is experiencing a hyperneic phase of Cheyne-Stokes respiration, CSR.