Detection of spontaneous termination of atrial fibrillation

We present techniques to detect various opes of terminating and non-terminating atrial fibrillation (AF) as required by the Computers in Cardiology Challenge 2004. First, we describe an automatic technique to distinguish non-terminating AF from terminating AE Our method models R-R intervals using mixtures of Gaussians and achieves an accuracy of 90% on the training set and 77% on the challenge test set. Second, we describe a semiautomatic technique to distinguish immediately terminaling AFfrom AF which terminates one minute latel: Our merhodfirst uses spectral models to determine which pairs of records are recorded from the same patient. This technique achieves 100% accuracy on the rraining set andpartitions the test set into 10 unique record pairs. We then examine by hand the end of each ECG record to determine the likely time ordering of the records in each pais thus distinguishing which record terminates immediately. This technique achieves an accuracy of 90% on the challenge test set.