A system for monitoring autoregulation comprising: a regional oxygen saturation sensor configured to obtain a regional oxygen saturation signal from a patient; and a controller comprising a processor configured to: receive a blood pressure signal and the regional oxygen saturation signal; determine a correlation-based measure indicative of the patient's autoregulation based at least in part on the blood pressure signal and the regional oxygen saturation signal; characterized in that the processor if further configured to calculate a data clustering metric indicative of two or more spreads of the correlation-based measure, each spread being within a respective window of blood pressures; determine whether each window of blood pressures is within an intact autoregulation zone or an impaired autoregulation zone based at least in part on the data clustering metric; and provide an output indicative of the patient's autoregulation status to an output device, wherein the output indicative of the patient's autoregulation status is based on the determination of whether each window of blood pressure is within the intact autoregulation zone or the impaired autoregulation zone. a regional oxygen saturation sensor configured to obtain a regional oxygen saturation signal from a patient; and a controller comprising a processor configured to: receive a blood pressure signal and the regional oxygen saturation signal; determine a correlation-based measure indicative of the patient's autoregulation based at least in part on the blood pressure signal and the regional oxygen saturation signal; characterized in that the processor if further configured to calculate a data clustering metric indicative of two or more spreads of the correlation-based measure, each spread being within a respective window of blood pressures; determine whether each window of blood pressures is within an intact autoregulation zone or an impaired autoregulation zone based at least in part on the data clustering metric; and provide an output indicative of the patient's autoregulation status to an output device, wherein the output indicative of the patient's autoregulation status is based on the determination of whether each window of blood pressure is within the intact autoregulation zone or the impaired autoregulation zone. receive a blood pressure signal and the regional oxygen saturation signal; determine a correlation-based measure indicative of the patient's autoregulation based at least in part on the blood pressure signal and the regional oxygen saturation signal; characterized in that the processor if further configured to calculate a data clustering metric indicative of two or more spreads of the correlation-based measure, each spread being within a respective window of blood pressures; determine whether each window of blood pressures is within an intact autoregulation zone or an impaired autoregulation zone based at least in part on the data clustering metric; and provide an output indicative of the patient's autoregulation status to an output device, wherein the output indicative of the patient's autoregulation status is based on the determination of whether each window of blood pressure is within the intact autoregulation zone or the impaired autoregulation zone.