Title :
Real-time estimation of magnitude-square coherence for use in implantable devices
Author :
Stephany, Gr ; Ropella, KM
Author_Institution :
Marquette Univ., Milwaukee, WI, USA
Abstract :
Magnitude square coherence (MSC) has been shown to be a useful technique in discriminating fibrillatory rhythms (FIB) from nonfibrillatory rhythms (NON-FIB). The authors present a method for estimating MSC in real-time for intracardiac electrograms using an overlapped moving discrete Fourier transform approach. Real-time discrimination of FIB and NONFIB is performed by using 32-point data segments and a Hanning window. Fibrillation is detected by using a simple threshold technique for mean MSC in the 0-60-Hz band. This method of real-time mean MSC estimation reliably discriminates FIB from NONFIB rhythms in a time period appropriate for use in implantable devices. A moving mean MSC offers a new perspective on cardiac dynamics
Keywords :
defibrillators; electrocardiography; medical signal processing; 0 to 60 Hz; Hanning window; cardiac dynamics; fibrillatory rhythms; implantable devices; intracardiac electrograms; magnitude-square coherence; nonfibrillatory rhythms; overlapped moving discrete Fourier transform approach; real-time estimation; threshold technique; Data analysis; Detection algorithms; Discrete Fourier transforms; Frequency estimation; Microprocessors; Morphology; Probability density function; Recursive estimation; Rhythm; Sampling methods;
Conference_Titel :
Computers in Cardiology 1992, Proceedings of
Conference_Location :
Durham, NC
Print_ISBN :
0-8186-3552-5
DOI :
10.1109/CIC.1992.269353
