BODY-WORN SYSTEM FOR CONTINUOUS, NONINVASIVE MEASUREMENT OF CARDIAC OUTPUT, STROKE VOLUME, CARDIAC POWER, AND BLOOD PRESSURE

摘要

The invention provides a system for measuring stroke volume (SV), cardiac output (CO), and cardiac power (CP) from a patient that features: 1) impedance sensor connected to at least two body-worn electrodes and including an impedance circuit that processes analog signals from the electrodes to measure an impedance signal (e.g. a TBEV waveform); 2) an ECG sensor connected to at least two chest-worn electrodes and including an ECG circuit that processes analog signals from the electrodes to measure and ECG signal; 3) an optical sensor connected to a body-worn optical probe and including an optical circuit that processes signals from the probe to measure at least one optical signal (e.g. a PPG waveform) from the patient; 4) a processing system, typically worn on the patient's wrist and connected through a wired interface to the optical sensor, and through either a wired or wireless interface to the TBEV and ECG sensors.

主权项

1. A method for determining stroke volume from a patient using a body-worn monitor, comprising:
(a) measuring an impedance signal with an impedance sensor operably connected to the body-worn monitor, the impedance sensor connected to at least two electrodes attached to the patient's body and comprising an impedance circuit; (b) measuring an optical signal with an optical sensor operably connected to the body-worn monitor, the optical sensor connected to an optical probe worn on the patient's body and comprising an optical circuit; (c) processing the impedance signal to determine a value of (dZ/dt)max; (d) processing the optical signal to determine a value of SFT; and (e) collectively processing (dZ/dt)max and SFT to determine the stroke volume.