Document Detail


Thoracic-impedance changes measured via defibrillator pads can monitor signs of circulation.
MedLine Citation:
PMID:  17289245     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
AIMS: To investigate the potential for finding an alternative for the 'pulse check' during CPR, we studied the use of thoracic impedance measured via the defibrillator pads for circulation assessment during CPR. MATERIALS AND METHODS: Transthoracic impedance, ECG and arterial pressures were recorded on 69 patients with a resulting data set of 434 segments. The circulatory-related impedance waveform was first isolated manually and features characterising its shape were suggested. RESULTS: The features were correlated with corresponding blood pressure measurements, where a low, but significant, correlation coefficient (0.3) was found. By dividing the data set in groups of sufficient and insufficient circulation and using a neural network, we found that trends in features of the impedance waveform showed a discriminative potential for the two groups. Our classifier achieved a sensitivity of 90% for recognising insufficient circulation with a specificity of 82%. CONCLUSIONS: We have shown that the circulation-related information found in the impedance signal may be used for circulatory assessment, especially the recognition of restoration of spontaneous circulation after cardiac arrest.
Authors:
Heidrun Losert; Martin Risdal; Fritz Sterz; Jon Nysaether; Klemens Köhler; Trygve Eftestøl; Cosima Wandaller; Helge Myklebust; Thomas Uray; Sven O Aase; Anton N Laggner
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-02-07
Journal Detail:
Title:  Resuscitation     Volume:  73     ISSN:  0300-9572     ISO Abbreviation:  Resuscitation     Publication Date:  2007 May 
Date Detail:
Created Date:  2007-04-20     Completed Date:  2007-11-13     Revised Date:  2009-08-25    
Medline Journal Info:
Nlm Unique ID:  0332173     Medline TA:  Resuscitation     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  221-8     Citation Subset:  IM    
Affiliation:
Department of Emergency Medicine, Medical University of Vienna, Austria.
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MeSH Terms
Descriptor/Qualifier:
Cardiography, Impedance / instrumentation*,  methods
Cardiopulmonary Resuscitation*
Defibrillators*
Female
Heart Arrest / therapy*
Humans
Male
Middle Aged
Prospective Studies
Pulse
Tidal Volume

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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