Apparatus and method for indicating cardiac output

John Anderson (Inventor), Cesar Navarro-Paredes (Inventor)

Research output: Patent

Abstract

An apparatus for indicating cardiac output comprises means for monitoring a patient's transthoracic impedance and generating a corresponding impedance signal, and signal processing means for (a) deriving a signal S1 which is a measure of the average amplitude of the impedance signal, (b) filtering the impedance signal at a plurality of different wavelengths within a predetermined frequency band, (c) for each filter deriving a signal S2 which is a measure of the average amplitude of the respective filter output, (d) calculating the ratio of the maximum one of the signals S2 derived from step (c) to the signal S1 derived from step (a), and (e) using the ratio from step (d) in a decision tree to provide a signal indicating cardiac output or not.
LanguageEnglish
Patent numberUS9155482 B2
Publication statusPublished - 13 Oct 2015

Fingerprint

Decision trees
Frequency bands
Signal processing
Wavelength
Monitoring

Keywords

  • Cardiac output
  • cardiac arrest
  • defibrillator
  • ICG
  • impedance
  • filters
  • electrodes

Cite this

Anderson, J., & Navarro-Paredes, C. (2015). Apparatus and method for indicating cardiac output. (Patent No. US9155482 B2).
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abstract = "An apparatus for indicating cardiac output comprises means for monitoring a patient's transthoracic impedance and generating a corresponding impedance signal, and signal processing means for (a) deriving a signal S1 which is a measure of the average amplitude of the impedance signal, (b) filtering the impedance signal at a plurality of different wavelengths within a predetermined frequency band, (c) for each filter deriving a signal S2 which is a measure of the average amplitude of the respective filter output, (d) calculating the ratio of the maximum one of the signals S2 derived from step (c) to the signal S1 derived from step (a), and (e) using the ratio from step (d) in a decision tree to provide a signal indicating cardiac output or not.",
keywords = "Cardiac output, cardiac arrest, defibrillator, ICG, impedance, filters, electrodes",
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Apparatus and method for indicating cardiac output. / Anderson, John (Inventor); Navarro-Paredes, Cesar (Inventor).

Patent No.: US9155482 B2.

Research output: Patent

TY - PAT

T1 - Apparatus and method for indicating cardiac output

AU - Anderson, John

AU - Navarro-Paredes, Cesar

N1 - Country: US Commercialisation Status: assigned Patent Application Date: 2009-03-04

PY - 2015/10/13

Y1 - 2015/10/13

N2 - An apparatus for indicating cardiac output comprises means for monitoring a patient's transthoracic impedance and generating a corresponding impedance signal, and signal processing means for (a) deriving a signal S1 which is a measure of the average amplitude of the impedance signal, (b) filtering the impedance signal at a plurality of different wavelengths within a predetermined frequency band, (c) for each filter deriving a signal S2 which is a measure of the average amplitude of the respective filter output, (d) calculating the ratio of the maximum one of the signals S2 derived from step (c) to the signal S1 derived from step (a), and (e) using the ratio from step (d) in a decision tree to provide a signal indicating cardiac output or not.

AB - An apparatus for indicating cardiac output comprises means for monitoring a patient's transthoracic impedance and generating a corresponding impedance signal, and signal processing means for (a) deriving a signal S1 which is a measure of the average amplitude of the impedance signal, (b) filtering the impedance signal at a plurality of different wavelengths within a predetermined frequency band, (c) for each filter deriving a signal S2 which is a measure of the average amplitude of the respective filter output, (d) calculating the ratio of the maximum one of the signals S2 derived from step (c) to the signal S1 derived from step (a), and (e) using the ratio from step (d) in a decision tree to provide a signal indicating cardiac output or not.

KW - Cardiac output

KW - cardiac arrest

KW - defibrillator

KW - ICG

KW - impedance

KW - filters

KW - electrodes

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Anderson J, Navarro-Paredes C, inventors. Apparatus and method for indicating cardiac output. US9155482 B2. 2015 Oct 13.