Methods and systems for determining physiological information based on low and high frequency components

摘要

A physiological monitoring system may process a physiological signal such a photoplethysmograph signal from a subject. The system may determine physiological information, such as a physiological rate, from the physiological signal. The system may use search techniques and qualification techniques to determine one or more initialization parameters. The initialization parameters may be used to calculate and qualify a physiological rate. The system may use signal conditioning to reduce noise in the physiological signal and to improve the determination of physiological information. The system may use qualification techniques to confirm determined physiological parameters. The system may also use autocorrelation techniques, cross-correlation techniques, fast start techniques, and/or reference waveforms when processing the physiological signal.

主权项

1. A subject pulse oximetry monitoring system for determining physiological information of a subject, comprising:
a pulse oximetry sensor configured to generate an intensity signal, wherein the pulse oximetry sensor is configured to detect light attenuated by the subject; and a pulse oximeter coupled to the pulse oximetry sensor, wherein the pulse oximeter is configured to:
filter the intensity signal into a low frequency component and a high frequency component, wherein each of the low frequency component and the high frequency component is a candidate for being associated with a physiological rate of the subject;determine one or more metrics for each of the low frequency component and the high frequency component;compare the one or more metrics determined based on the low frequency component with the one or more metrics determined based on the high frequency component;select either the low frequency component or the high frequency component based on the comparison;determine a value indicative of the physiological rate of the subject based on the selected frequency component, wherein the physiological rate is not determined from the frequency component that was not selected; anddisplay the value indicative of the physiological rate of the subject on a display.