Impedance cardiography. The impact of new technology.
The 1990s have witnessed major advances in impedance cardiography technology. Problems existed with the methods used to calculate cardiac output. Excessive lung fluid, as often found in critically ill patients, may also invalidate measurements. The signal processing and measurement techniques used i...
| Publicado en: | Anaesthesia Vol. 53; no. 7; pp. 677 - 685 |
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| Formato: | research Journal Article |
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Wiley-Blackwell
Jul1998
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=104798966&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 104798966 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 00032409 1WP jtl: Anaesthesia issn: 00032409 maglogo: Y pubinfo: dt: Jul1998 vid: 53 iid: 7 pid: 480 pub: Wiley-Blackwell place: Malden, Massachusetts artinfo: ui: 104798966 104798966 NLM9771176 2011158523 10.1046/j.1365-2044.1998.437-az0550.x NLM9771176 104798966 ppf: 677 ppct: 8 formats: tig: atl: Impedance cardiography. The impact of new technology. aug: au: Critchley, L A affil: Department of Anaesthesia and Intensive Care, Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, People's Republic of China. sug: subj: Cardiography, Impedance Equipment and Supplies Evaluation Research Human Models, Biological Monitoring, Physiologic Methods Signal Processing, Computer Assisted ab: The 1990s have witnessed major advances in impedance cardiography technology. Problems existed with the methods used to calculate cardiac output. Excessive lung fluid, as often found in critically ill patients, may also invalidate measurements. The signal processing and measurement techniques used in older systems were deficient. The newer systems, of which there are at least six, incorporate novel and improved signal processing techniques. They also offer analog visual displays, personal computer interfacing, sophisticated analytical software and haemodynamic patient management systems. Evaluation of these systems is difficult because no true 'gold standard' method of cardiac output measurement exists. When compared with thermodilution techniques, limits of agreement of +/- 20-30% seem acceptable. These limits can be achieved in normal subjects but not in critically ill patients. Validation data are available for only half of the new systems. Until recently, the main application for impedance cardiography has been research but improved accuracy should lead to increased clinical usage. pubtype: Academic Journal doctype: research Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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