A method for the concurrent treatment of obstructive sleep apnea and hypertension in a patient comprises providing a flow of treatment gas to the airway of the patient in accordance with a first set of flow parameters. Determining that the patient has achieved stable breathing while receiving the provided flow of treatment gas in accordance with the first set of parameters. Determining a set of target patient breath parameters from breath data collected from the patient. Adjusting the flow of treatment gas to a different set of flow parameters. Determining that the new patient breath data, collected from the patient, accords with the target patient breath parameters and providing the flow of treatment gas to the patient in accordance with the different set of flow parameters. The target patient breath parameters include a target tidal volume of the patient which is greater than a first tidal volume of the patient.