Apparatus and method for indicating cardiac output

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

Research output: Patent

37 Downloads (Pure)


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.
Original languageEnglish
Patent numberUS9155482 B2
Publication statusPublished (in print/issue) - 13 Oct 2015


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


Dive into the research topics of 'Apparatus and method for indicating cardiac output'. Together they form a unique fingerprint.

Cite this