DATA RELIABILITY INDICATOR, DATA RELIABILITY INDICATION METHOD, AND PATIENT MONITOR

摘要

PROBLEM TO BE SOLVED: To provide a data reliability indicator indicating occurrence of each of pulses in a photoplethysmographic waveform obtained from a pulse oximeter.SOLUTION: A data reliability indicator includes physiological sensor outputs each of which is associated with a decay of light coming from a body tissue and which express physiological parameters of one or plural body tissues, plural physiological data items deduced from the physiological sensor outputs, plural signal quality measures representing qualities of the respective physiological sensor outputs, plural thresholds associated with the respective signal quality measures, plural comparator outputs responsive to the respective signal quality measures and associated thresholds, an alert trigger output that combines the comparator outputs, and a low signal quality alert to be produced in response to the alert trigger output. The threshold is designated so that the alert can be produced over a time over which the reliability of data is low.