Paper Info
Title
Characterization of QT and RR interval series during acute myocardial ischemia by means of recurrence quantification analysis.
Abstract
This study is aimed to investigate the nonlinear dynamic properties of the fluctuations in ventricular repolarization, heart rate and their correlation during acute myocardial ischemia. From 13 ECG records in long-term ST-T database, 170 ischemic episodes were selected with the duration of 34 s to 23 min 18 s, and two 5-min episodes immediately before and after each ischemic episode as non-ischemic ones for comparison. QT interval (QTI) and RR interval (RRI) were extracted and the ectopic beats were removed. Recurrence quantification analysis (RQA) was performed on QTI and RRI series, respectively, and cross recurrence quantification analysis (CRQA) on paired normalized QTI and RRI series. Wilcoxon signed-rank test was used for statistical analysis. Results revealed that the RQA indexes for QTI and HRI series had the same changing trend during ischemia with more significantly changed indexes in QTI series. In the CRQA, indexes related to the vertical and horizontal structures in recurrence plot significantly increased, representing decreased dependency of QTI on RRI. Both QTI and RRI series showed reduced complexity during ischemia with higher sensitivity in ventricular repolarization. The weakened coupling between QTI and RRI suggests the decreased influence of sinoatrial node on QTI modulation during ischemia.
Year
DOI
Venue
2011
10.1007/s11517-010-0671-5
Med. Biol. Engineering and Computing
Keywords
Field
DocType
acute myocardial ischemiarecurrence quantification analysis rqa � qt variability qtv � heart rate variability hrv,nonlinear dynamics,indexation,recurrence quantification analysis,qt interval,recurrence plot,heart rate variability,statistical analysis
QT interval,Sinoatrial node,RR interval,Internal medicine,Cardiology,Anesthesia,Wilcoxon signed-rank test,Ischemia,Heart rate,Recurrence quantification analysis,Medicine,Recurrence plot
Journal
Volume
Issue
ISSN
49
1
1741-0444
Citations 
PageRank 
References 
5
0.65
5
Authors
2
Name
Order
Citations
PageRank
Yi Peng194.16
Zhongwei Sun2336.67