Title :
3-dimensional Poincare plots of the QT intervals-an approach to nonlinear QT analysis
Author :
Baranowski, R. ; Zebrowski, J.J. ; Poplawska, W. ; Mananas, M.A. ; Jane, R. ; Caminal, P. ; Chojnowska, L. ; Rydlewska-Sadowska, W. ; Vinolas, X. ; Guindo, J. ; De Luna, A. Bayes
Author_Institution :
Nat. Inst. of Cardiology, Poland
Abstract :
The Poincare plots-a simple graphical, nonlinear method was implemented to express 24-h QT interval changes. The group of 23 pts with hypertrophic cardiomyopathy was analyzed (11 pts. with higher and 12 with lower risk of sudden cardiac death). The control group consisted of 10 healthy subjects. 24-h Holter ECG recordings were analyzed and RR and QT intervals were measured beat by beat. 3 dimensional QT and RR plots were constructed in the time delay coordinates. Three main forms of QT plots were observed, highly different in cases with hypertrophic cardiomyopathy compared to normals. Different shapes of QT and RR plots revealed a complex nonlinear relation of the QT and RR intervals.
Keywords :
Poincare mapping; electrocardiography; medical signal processing; 24 hour; 24-h QT interval changes; 3-dimensional Poincare plots; Holter ECG recordings; QT intervals; RR plots; beat by beat; complex nonlinear relation; control group; healthy subjects; hypertrophic cardiomyopathy; nonlinear QT analysis; simple graphical nonlinear method; sudden cardiac death; time delay coordinates; Cardiology; Coordinate measuring machines; Cybernetics; Delay effects; Electrocardiography; Heart rate interval; Heart rate variability; Hospitals; Risk analysis; Time measurement;
Conference_Titel :
Computers in Cardiology 1995
Conference_Location :
Vienna, Austria
Print_ISBN :
0-7803-3053-6
DOI :
10.1109/CIC.1995.482783
