Sensing for health status management

A system for determining a health status of a patient using an implantable medical device configured for subcutaneous implantation outside of a thorax of the patient, the system comprising:

• the implantable medical device comprising at least one optical sensor;
• and
• processing circuitry configured to:
• determine a current tissue oxygen saturation value of the patient based on a first signal received from the at least one optical sensor;
• determine a current pulsatile oxygen saturation value of the patient based on a second signal received from the at least one optical sensor;
• compare the current tissue oxygen saturation value and the current pulsatile oxygen saturation value to corresponding ones of a baseline tissue oxygenation saturation value and a baseline pulsatile oxygen saturation value;
• determine a heart failure status of the patient at least based on the comparison of the current tissue oxygen saturation value to the baseline tissue oxygen saturation value;
• determine a pulmonary status of the patient at least based on the comparison of the current pulsatile oxygen saturation value of the patient to the baseline pulsatile oxygen saturation value;
• and
• determine the health status of the patient based on a combination of the heart failure status and the pulmonary status of the patient.

A system for determining a health status of a patient using an implantable medical device configured for subcutaneous implantation outside of a thorax of the patient, the system comprising:

• the implantable medical device comprising at least one optical sensor;
• and
• processing circuitry configured to:
• determine a current tissue oxygen saturation value of the patient based on a first signal received from the at least one optical sensor;
• determine a current pulsatile oxygen saturation value of the patient based on a second signal received from the at least one optical sensor;
• determine a current tissue hemoglobin index value of the patient based on a third signal received from the at least one optical sensor;
• compare the current tissue oxygen saturation value, the current pulsatile oxygen saturation value, and the current tissue hemoglobin index value to corresponding ones of a baseline tissue oxygenation saturation value, a baseline pulsatile oxygen saturation value, and a baseline tissue hemoglobin index value;
• determine whether a difference between the current tissue oxygen saturation value and the baseline tissue oxygen saturation value satisfies a tissue oxygen saturation threshold value that is associated with a change in a cardiac function of the patient;
• determine whether a difference between the current pulsatile oxygen saturation value and the baseline pulsatile oxygen saturation value satisfies a pulsatile oxygen saturation threshold value that is associated with a change in a lung function of the patient;
• and
• determine whether a difference between the current tissue hemoglobin index value and the baseline tissue hemoglobin index value satisfies a tissue hemoglobin index threshold value that is associated with a change in a red blood cell count of the patient;
• determine a heart failure status of the patient at least based on the comparison of the current tissue oxygen saturation value to the baseline tissue oxygen saturation value;
• determine a pulmonary status of the patient at least based on the comparison of the current pulsatile oxygen saturation value of the patient to the baseline pulsatile oxygen saturation value;
• determine an anemia status of the patient at least based on the comparison of the current tissue hemoglobin index value to the baseline tissue hemoglobin index value;
• determine the health status of the patient based on a combination of the heart failure status, the pulmonary status, and the anemia status of the patient;
• and
• transmit the health status of the patient to a remote computer, wherein the remote computer comprises processing circuitry configured to:
• receive the health status of the patient transmitted by the processing circuitry of the implantable medical device;
• determine instructions for a medical intervention based on the health status of the patient;
• and
• transmit the instructions for the medical intervention to a user device.

A system for determining a health status of a patient, the system comprising:

• means for determining a current tissue oxygen saturation value of the patient based on a first signal received from at least one optical sensor;
• means for determining a current pulsatile oxygen saturation value of the patient based on a second signal received from the at least one optical sensor;
• means for comparing the current tissue oxygen saturation value and, the current pulsatile oxygen saturation value to corresponding ones of a baseline tissue oxygenation saturation value and a baseline pulsatile oxygen saturation value;
• means for determining a heart failure status of the patient at least based on the comparison of the current tissue oxygen saturation value to the baseline tissue oxygen saturation value;
• means for determining a pulmonary status of the patient at least based on the comparison of the current pulsatile oxygen saturation value of the patient to the baseline pulsatile oxygen saturation value;
• and
• means for determining the health status of the patient based on a combination of the heart failure status and the pulmonary status of the patient.

A non-transitory computer-readable medium storing instructions for causing processing circuitry to perform a method for determining a health status of a patient using an implantable medical device configured for subcutaneous implantation outside of a thorax of the patient, the implantable medical device comprising at least one optical sensor, the method comprising:

• determining a current tissue oxygen saturation value of the patient based on a first signal received from the at least one optical sensor;
• determining a current pulsatile oxygen saturation value of the patient based on a second signal received from the at least one optical sensor;
• comparing the current tissue oxygen saturation value and the current pulsatile oxygen saturation value to corresponding ones of a baseline tissue oxygenation saturation value and a baseline pulsatile oxygen saturation value;
• determining a heart failure status of the patient at least based on the comparison of the current tissue oxygen saturation value to the baseline tissue oxygen saturation value;
• determining a pulmonary status of the patient at least based on the comparison of the current pulsatile oxygen saturation value of the patient to the baseline pulsatile oxygen saturation value;
• and
• determining the health status of the patient based on a combination of the heart failure status and the pulmonary status of the patient.