Abstract: . . .  Publication Copyright IEEE 2004 Page 2 1 Introduction As described in the call for participation for the PhysioNet 2004 Challenge, atrial fibrillation (AF) is the most common serious cardiac arrhythmia. The risks of sustained AF include stroke and myocardial infarction, caused by the formation of blood clots within stagnant blood volumes in the atria[5]. AF affects about 2% of the general population and 8%-11% of those older than 65 years. The demand for effective therapeutic strategies for AF is anticipated to increase . . .
. . .  Moody. Computers in cardiology challenge 2004. URL=http://www.physionet.org/challenge/2004/, October 2003. [6] L. R. Rabiner and B. H. Juang. Fundamentals of Speech Recognition . PrenticeHall, 1993. [7] I Savelieva and A. John Camm. Atrial pacing for the prevention and termination of atrial fibrillation . Am J Geriatr Cardiol , 11(6):380398, 2002. 7 Page 9 Record Closest Second Third s01 t01 0.1118 s07 3.5054 t08 3.6134 s02 t02 0.0329 t05 0.4165 s05 0.4851 s03 . . .
. . .  beginning of the ECG signals for patients S01 and T01. 0 50 100 150 200 250 300 0 500 1000 1500 2000 2500 3000 3500 s t Figure 3: 512 point Fourier transforms of the beginning of the ECG signals for patients S01 and T02. We therefore use the following approach based on speech processing applications to automati- cally determine which pairs of records belong to the same patient. We first convert each ECG signal into a sequence of frames each of length 512 samples. We then convert . . .
. . .  complete the second task of the Challenge, the pairs are then manually ordered in time through visual inspection of the last 400 samples of each record. This timeframe gives a good balance of multiple beats and beat detail in visual presentation. As a heuristic, for each pair the record with the greatest cessation or change in atrial activity is chosen as the terminating record. For example the last 100 samples for the first pair of records, b01 and b03, is shown in Figure 4. Here we choose record b03 as the terminating record of the pair because of the absence of p-waves . . .
. . .  cardiology challenge 2004. URL=http://www.physionet.org/challenge/2004/, October 2003. [6] L. R. Rabiner and B. H. Juang. Fundamentals of Speech Recognition . PrenticeHall, 1993. [7] I Savelieva and A. John Camm. Atrial pacing for the prevention and termination of atrial fibrillation . Am J Geriatr Cardiol , 11(6):380398, 2002. 7 Page 9 Record Closest Second Third s01 t01 0.1118 s07 3.5054 t08 3.6134 s02 t02 0.0329 t05 0.4165 s05 0.4851 s03 t03 0.1488 s09 0.7625 t09 . . .
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