Document Detail

Correction for respiration artifact in pulmonary blood pressure signals of ventilated patients.
MedLine Citation:
PMID:  8934346     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To develop an algorithm that corrects pulmonary artery pressure signals of ventilated patients for the respiration artifact. The algorithm should test the validity of the pulmonary pressure signal and differentiate between the cyclic respiration artifact and true measurement artifacts. METHODS: The shape of each pulmonary pressure beat is described by eight characteristic features, including mean pressure value and the systolic and diastolic timing and pressure values. The features are corrected for the respiration artifact by fitting them in a least-squares sense on the first and second harmonics of the ventilator frequency. The corrected features are used by a signal validation algorithm, which adds a validity flag to each pressure beat. The validation algorithm rejects pressure beats with sudden changes in their shape but adapts itself when the changes persist. RESULTS: The performance of the correction and validation technique was evaluated using pulmonary artery pressure signals of 30 patients who were scheduled for open heart surgery. The algorithm correctly recognized as invalid data those pressure signals disturbed by coagulation, surgical manipulations, or flushes of the pressure line. The algorithm marked on average 77 +/- 11% of the pulmonary pressure beats as valid. CONCLUSIONS: The validation algorithm marked sufficient pressure beats as valid to update a trend display every 5 sec. The correction algorithm enabled the validation algorithm to differentiate between true measurement artifacts and the respiration artifact.
S A Hoeksel; J A Blom; J R Jansen; J J Schreuder
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of clinical monitoring     Volume:  12     ISSN:  0748-1977     ISO Abbreviation:  J Clin Monit     Publication Date:  1996 Sep 
Date Detail:
Created Date:  1997-02-26     Completed Date:  1997-02-26     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8506707     Medline TA:  J Clin Monit     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  397-403     Citation Subset:  IM    
Department of Anaesthesiology, Cardiovascular Research Institute Maastricht, University of Limburg, The Netherlands.
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MeSH Terms
Catheterization, Swan-Ganz
Monitoring, Physiologic
Pulmonary Wedge Pressure*
Respiration, Artificial*
Signal Processing, Computer-Assisted

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

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