Determining changes to autoregulation

A method comprising:

• receiving, by processing circuitry and from sensing circuitry, a first signal indicative of a first physiological parameter of a patient;
• receiving, by the processing circuitry and from the sensing circuitry, a second signal indicative of a second physiological parameter of the patient;
• determining, by the processing circuitry, a first estimate of a limit of autoregulation of the patient based on the first signal and the second signal;
• determining, by the processing circuitry, a blood pressure difference between the first estimate of the limit of autoregulation and one or more other estimates of the limit of autoregulation;
• determining, by the processing circuitry, a weighted average of the first estimate of the limit of autoregulation and a previous value of the limit of autoregulation based on the blood pressure difference between the first estimate of the limit of autoregulation and the one or more other estimates of the limit of autoregulation;
• determining, by the processing circuitry, an autoregulation status based on the weighted average;
• and
• outputting, by the processing circuitry for display via the display, an indication of the autoregulation status.

A device comprising:

• a display;
• and
• processing circuitry configured to:
• receive a first signal indicative of a first physiological parameter of a patient;
• receive a second signal indicative of a second physiological parameter of the patient;
• receive a third signal indicative of a third physiological parameter of the patient;
• determine a first estimate of a limit of autoregulation of the patient and two or more other estimates of the limit of autoregulation based on the first signal, the second signal, and the third signal;
• determine a blood pressure difference between the first estimate of the limit of autoregulation and two or more other estimates of the limit of autoregulation;
• determine a weighting factor based on the blood pressure difference between the first estimate and the two or more other estimates;
• determine a weighted average of the first estimate of the limit of autoregulation and a previous value of the limit of autoregulation based on the weighting factor;
• and
• determine an autoregulation status based on the weighted average.