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A Reliable Method for Rhythm Analysis during Cardiopulmonary Resuscitation

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Date
2014
Author
Ayala Fernández, Unai
Irusta Zarandona, Unai
Ruiz Ojeda, Jesús María
Eftestol, T.
Kramer-Johansen, J.
Alonso-Atienza, F.
Alonso Ruiz de Erenchun, Estibaliz
González Otero, Digna María
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BioMed Research International 2014 : (2014) // Article ID 872470
URI
http://hdl.handle.net/10810/17752
Abstract
nterruptions in cardiopulmonary resuscitation (CPR) compromise defibrillation success. However, CPR must be interrupted to analyze the rhythm because although current methods for rhythm analysis during CPR have high sensitivity for shockable rhythms, the specificity for nonshockable rhythms is still too low. This paper introduces a new approach to rhythm analysis during CPR that combines two strategies: a state-of-the-art CPR artifact suppression filter and a shock advice algorithm (SAA) designed to optimally classify the filtered signal. Emphasis is on designing an algorithm with high specificity. The SAA includes a detector for low electrical activity rhythms to increase the specificity, and a shock/no-shock decision algorithm based on a support vector machine classifier using slope and frequency features. For this study, 1185 shockable and 6482 nonshockable 9-s segments corrupted by CPR artifacts were obtained from 247 patients suffering out-of-hospital cardiac arrest. The segments were split into a training and a test set. For the test set, the sensitivity and specificity for rhythm analysis during CPR were 91.0% and 96.6%, respectively. This new approach shows an important increase in specificity without compromising the sensitivity when compared to previous studies.
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