Document Detail

The triangular wave test for electrocardiographic devices: a historical perspective.
MedLine Citation:
PMID:  15534805     Owner:  NLM     Status:  MEDLINE    
Baseline wander makes interpretation ECG recordings difficult, especially the assessment of ST deviation. Eliminating baseline wander without distorting the ST segment is a problem. The traditional high pass filter with a 0.5 Hz low frequency cutoff effectively suppresses baseline but introduces considerable distortion in the level of the ST segment. This distortion results from phase nonlinearities that occur when frequency content and wave amplitude change abruptly, as occurs where the end of the QRS complex meets the ST segment. Since the 1980s nonlinear, digital filters have been designed that can increase the low frequency cutoff without the introduction of phase distortion. The triangular wave test, first described in the 1990 AHA Recommendations, is an objective method for measuring the ability to suppress baseline wander without affecting the ST segment. This methodology was adopted in 3 American National Standards.
James J Bailey
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Publication Detail:
Type:  Historical Article; Journal Article    
Journal Detail:
Title:  Journal of electrocardiology     Volume:  37 Suppl     ISSN:  0022-0736     ISO Abbreviation:  J Electrocardiol     Publication Date:  2004  
Date Detail:
Created Date:  2004-11-09     Completed Date:  2005-03-03     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0153605     Medline TA:  J Electrocardiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  71-3     Citation Subset:  IM    
Center of Information Technology, National Institutes of Health, Bethesda, MD 20892-5620, USA.
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MeSH Terms
Electrocardiography / history*,  instrumentation
Electrocardiography, Ambulatory / history,  instrumentation
History, 20th Century

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

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