RESPIRATION RATE DETERMINATION IN IMPEDANCE PNEUMOGRAPHY

摘要

A system for monitoring respiration, and a method for determining respiration rate, is disclosed. In one embodiment, the respiration rate is determined from a power spectral density template that is updated, or not, based on whether a power spectral density for a current window of in-band filtered impedance respiration signal is determined to be noisy or not.

主权项

1. A method for deriving a signal quality metric, comprising:
acquiring an impedance respiration signal; generating a series of sets of windowed data from the impedance respiration signal, wherein each window of data comprises data points acquired over a specified duration and is offset from a preceding window by a fixed interval; filtering the impedance respiration signal through at least an in-band filter to generate an in-band filtered signal; for each window of in-band filtered signals, generating a respective power spectral density; determining whether the respective power spectral density for a current window is noisy or not noisy;
if the respective power spectral density for the current window is not noisy, updating a previous power spectral density template based on the respective power spectral density for the current window to generate a current power spectral density template;if the respective power spectral density for the current window is noisy, not updating the previous power spectral density template; identifying at least one peak and the corresponding frequencies and powers associated with the identified peaks within the current power spectral density template; and determining a respiration rate based on the at least one identified peak.