Document Detail


Early recognition of regional cardiac ischemia using a 3-axis accelerometer sensor.
MedLine Citation:
PMID:  15886438     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Perioperative mortality in coronary artery bypass grafting is usually caused by reduced left ventricular function due to regional myocardial ischemia or infarction. Post-operative graft occlusion is a well-known problem in coronary surgery. A sensitive tool to detect graft occlusion and monitor myocardial function may give the opportunity to revise malfunctioning grafts before departure from the hospital. This paper describes how a new method can detect cardiac ischemia using a 3-axis piezoelectric accelerometer. In three anesthetized pigs, a 3-axis piezoelectric accelerometer was sutured on the lateral free wall of the left ventricle. The left anterior descending (LAD) was occluded for different time periods and the accelerometer data were sampled with a PC. Short-time Fourier transform was calculated based on the accelerometer time series. The results were visualized using a 2D color-coded time-frequency plot. In the area of occlusion, a change to stronger power of higher harmonics was observed. Consequently, a difference value between the instant frequency pattern and a reference frequency pattern showed a rise in absolute value during the occlusion period. The preliminary results indicate that early recognition of regional cardiac ischemia is possible by analyzing accelerometer data acquired from the three animal trials using the prototype 3-axis accelerometer sensor.
Authors:
Ole Jakob Elle; Steinar Halvorsen; Martin Gunnar Gulbrandsen; Lars Aurdal; Andre Bakken; Eigil Samset; Harald Dugstad; Erik Fosse
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Publication Detail:
Type:  Evaluation Studies; Journal Article     Date:  2005-04-15
Journal Detail:
Title:  Physiological measurement     Volume:  26     ISSN:  0967-3334     ISO Abbreviation:  Physiol Meas     Publication Date:  2005 Aug 
Date Detail:
Created Date:  2005-05-11     Completed Date:  2005-10-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9306921     Medline TA:  Physiol Meas     Country:  England    
Other Details:
Languages:  eng     Pagination:  429-40     Citation Subset:  IM    
Affiliation:
The Interventional Centre, Rikshospitalet University Hospital, Oslo, Norway.
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MeSH Terms
Descriptor/Qualifier:
Acceleration*
Algorithms
Animals
Coronary Disease / complications,  diagnosis*,  physiopathology*
Diagnosis, Computer-Assisted / methods*
Equipment Design
Equipment Failure Analysis
Movement
Pilot Projects
Reproducibility of Results
Sensitivity and Specificity
Swine
Transducers*
Ventricular Dysfunction, Left / diagnosis*,  etiology,  physiopathology*

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


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