Devices and methods for monitoring physiologic parameters

Abstract

Devices and methods for monitoring physiologic parameters are described herein which may utilize a non-invasive respiratory monitor to detect minor variations in expiratory airflow pressure known as cardiogenic oscillations which are generated by changes in the pulmonary blood volume that correspond with the cardiac cycle. These cardiogenic oscillations are a direct indicator of cardiac function and may be used to correlate various physiologic parameters such as stroke volume, pulmonary artery pressure, etc.

What is claimed is: 
     
         1 . A system for determining one or more physiologic parameters of a subject, comprising:
 a flow or pressure sensor configured to monitor respiratory activity of the subject;   a controller in communication with the flow or pressure sensor, wherein the controller is programmed to:
 extract one or more cardiogenic oscillation waveforms from the respiratory activity, 
 determine shape data of the cardiogenic oscillation waveforms to determine one or more physiologic parameters of the subject, 
 provide an indication of a health status of the subject, and 
 prompt the subject to actively modify their respiratory activity, if needed, to reduce or enhance an effect of respiratory activity on the cardiogenic oscillation waveforms.