| Possibilities for predictive measurement of the transthoracic impedance in defibrillation. | |
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MedLine Citation:
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PMID: 11695659 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Transthoracic electrical defibrillation is administered by high voltages and currents applied through large size electrodes. Therefore, the defibrillator load impedance becomes an essential factorfor the efficacy of the procedure. Attempts at prediction of transthoracic impedance by pre-shock measurement with low-amplitude high-frequency current have yielded apparently promising results. A reassessment was undertaken of the comparison between transthoracic impedance measured over a wide frequency range (bioimpedance spectroscopy) and measured during the shock. An estimation of the possibilities for pre-shock 'prediction ' of the impedance was performed, to allow adequate selection of the defibrillation energy or current with the intention of increasing the possibility for positive results with the first shock. Data were obtained from experimental fibrillation/defibrillation cycles on dogs andfrom cardioversion of atrial fibrillation or flutter in patients. The final results suggest that high-frequency low-amplitude impedance measurements cannot predict the corresponding value during the shock with very high accuracy, as differences up to 15-17% were found using biphasic pulses in patients. However, the method can be used for approximate assessments. |
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Authors:
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V Krasteva; F A Hatib; E Trendafilova; I Daskalov |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of medical engineering & technology Volume: 25 ISSN: 0309-1902 ISO Abbreviation: J Med Eng Technol Publication Date: 2001 Sep-Oct |
Date Detail:
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Created Date: 2001-11-06 Completed Date: 2002-02-07 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 7702125 Medline TA: J Med Eng Technol Country: England |
Other Details:
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Languages: eng Pagination: 195-200 Citation Subset: IM |
Affiliation:
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Centre of Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev str. Bl. 105, 1113 Sofia, Bulgaria. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Animals Atrial Fibrillation / physiopathology, therapy Atrial Flutter / physiopathology, therapy Dogs Electric Countershock* Electric Impedance Humans Middle Aged Thorax / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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