Patient monitor for determining microcirculation state

A patient monitor configured to determine a microcirculation state, the patient monitor comprising:

• a sensor interface configured to receive a signal from a physiological sensor, the signal indicative of first and second measurement values corresponding to respective first and second physiological parameters, the physiological sensor configured to transmit light of at least one wavelength into tissue of a patient and to detect the light after it has been attenuated by the tissue;
• and
• one or more processors configured to:
• determine a relationship between the first and second physiological parameters;
• and
• compare the determined relationship with stored lookup data indicative of a microcirculation state of blood vessels to determine if a blocked or partially blocked microcirculation state exists in at least a portion of blood vessels in the tissue.

A method of non-invasively determining a microcirculation state, the method comprising:

• obtaining, at a tissue site by a non-invasive physiological sensor, first and second measurement values corresponding to respective first and second physiological parameters;
• determining a relationship between the first and second physiological parameters;
• and
• comparing the determined relationship with stored lookup data indicative of a microcirculation state of blood vessels to determine if a blocked or partially blocked microcirculation state exists in at least a portion of blood vessels at the tissue site.