A system comprising: a blood pressure sensing device ; an oxygen saturation sensing device ; and processing circuitry configured to: determine calibration data for a continuous non-invasive blood pressure model at a calibration point by at least: receiving, from the blood pressure sensing device, blood pressure measurements of a patient at the calibration point, receiving, from the oxygen saturation sensing device, a first photoplethysmographic (PPG) signal at the calibration point, and deriving first values of a set of metrics for the patient from the first PPG signal; receive, from the oxygen saturation sensing device, a second PPG signal at a particular time subsequent to the calibration point; derive second values of the set of metrics for the patient from the second PPG signal: and determine, using the continuous non-invasive blood pressure model and based at least in part on inputting the calibration data determined at the calibration point, the second values of the set of metrics, and an elapsed time at the particular time since the calibration point into the continuous non-invasive blood pressure model, a blood pressure of the patient at the particular time. a blood pressure sensing device ; an oxygen saturation sensing device ; and processing circuitry configured to: determine calibration data for a continuous non-invasive blood pressure model at a calibration point by at least: receiving, from the blood pressure sensing device, blood pressure measurements of a patient at the calibration point, receiving, from the oxygen saturation sensing device, a first photoplethysmographic (PPG) signal at the calibration point, and deriving first values of a set of metrics for the patient from the first PPG signal; receive, from the oxygen saturation sensing device, a second PPG signal at a particular time subsequent to the calibration point; derive second values of the set of metrics for the patient from the second PPG signal: and determine, using the continuous non-invasive blood pressure model and based at least in part on inputting the calibration data determined at the calibration point, the second values of the set of metrics, and an elapsed time at the particular time since the calibration point into the continuous non-invasive blood pressure model, a blood pressure of the patient at the particular time. determine calibration data for a continuous non-invasive blood pressure model at a calibration point by at least: receiving, from the blood pressure sensing device, blood pressure measurements of a patient at the calibration point, receiving, from the oxygen saturation sensing device, a first photoplethysmographic (PPG) signal at the calibration point, and deriving first values of a set of metrics for the patient from the first PPG signal; receiving, from the blood pressure sensing device, blood pressure measurements of a patient at the calibration point, receiving, from the oxygen saturation sensing device, a first photoplethysmographic (PPG) signal at the calibration point, and deriving first values of a set of metrics for the patient from the first PPG signal; receive, from the oxygen saturation sensing device, a second PPG signal at a particular time subsequent to the calibration point; derive second values of the set of metrics for the patient from the second PPG signal: and determine, using the continuous non-invasive blood pressure model and based at least in part on inputting the calibration data determined at the calibration point, the second values of the set of metrics, and an elapsed time at the particular time since the calibration point into the continuous non-invasive blood pressure model, a blood pressure of the patient at the particular time. <EOS>