Detection of Cardiac Arrest using a Simplified Frequency Analysis of the Impedance Cardiogram recorded from Defibrillator Pads

CO Navarro, NA Cromie, C Turner, JMCC Anderson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

An algorithm based only on the impedance cardiogram (ICG) recorded through two defibrillation pads, using the strongest frequency component and amplitude, incorporated into a defibrillator could determine circulatory arrest and reduce delays in starting cardiopulmonary resuscitation (CPR). Frequency analysis of the ICG signal is carried out by integer filters on a sample by sample basis. They are simpler, lighter and more versatile when compared to the FFT. This alternative approach, although less accurate, is preferred due to the limited processing capacity of devices that could compromise real time usability of the FFT. These two techniques were compared across a data set comprising 13 cases of cardiac arrest and 6 normal controls. The best filters were refined on this training set and an algorithm for the detection of cardiac arrest was trained on a wider data set. The algorithm was finally tested on a validation set. The ICG was recorded in 132 cardiac arrest patients (53 training, 79 validation) and 97 controls (47 training, 50 validation): the diagnostic algorithm indicated cardiac arrest with a sensitivity of 81.1% (77.6 – 84.3) and specificity of 97.1% (96.7 – 97.4) for the validation set (95% confidence intervals). Automated defibrillators with integrated ICG analysis have the potential to improve emergency care by lay persons enabling more rapid and appropriate initiation of CPR and when combined with ECG analysis they could improve on the detection of cardiac arrest.
Original languageEnglish
Title of host publicationUnknown Host Publication
PublisherIEEE
Pages1709-1712
Number of pages4
DOIs
Publication statusPublished - 29 Dec 2011
Event33rd Annual International Conference of the IEEE EMBS - Boston, MA, USA
Duration: 29 Dec 2011 → …

Conference

Conference33rd Annual International Conference of the IEEE EMBS
Period29/12/11 → …

Keywords

  • ICG
  • bioimpedance
  • resuscitation
  • impedance cardiogram
  • CPR
  • defibrillation
  • FFT
  • digital filtering

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