title: A new approach to QRS segmentation based on wavelet bases and adaptive threshold technique.
abstract: In this paper, we develop and evaluate a new approach to QRS segmentation based on the combination of two techniques: wavelet bases and adaptive threshold. Firstly, QRS complexes are identified without a preprocessing stage. Then, each QRS is segmented by identifying the complex onset and offset. We evaluated the algorithm on two manually annotated databases, the QT-database and the MIT-BIH Arrhythmia database. The QRS detector obtained a sensitivity of 99.02% and a positive predictivity of 99.35% over the first lead of the validation databases (more than 192,000 beats), while for the QT-database, values larger than 99.6% were attained. As for the delineation of the QRS complex, the mean and the standard deviation of the differences between the automatic and the manual annotations were computed. Using QT-database which contains recordings of annotated ECG with a sampling rate of 250 Hz, we obtain the average of the differences not exceeding two sampling intervals, while the standard deviations were within acceptable range of values.
authors.affiliation: Department of Teleinformatics Engineering, Federal University of Ceará, Av. Mister Hull, S/N-CEP 60455-760, Fortaleza, Ceará, Brazil. joaopdvm@yahoo.com.br
authors.forename: João P V
authors.initials: JP
authors.lastname: Madeiro
authors.forename: Paulo C
authors.initials: PC
authors.lastname: Cortez
authors.forename: Francisco I
authors.initials: FI
authors.lastname: Oliveira
authors.forename: Robson S
authors.initials: RS
authors.lastname: Siqueira
mesh_terms: D000465:Algorithms; D001185:Artificial Intelligence; D003936:Diagnosis, Computer-Assisted / Q000379:methods*; D004056:Differential Threshold; D004562:Electrocardiography / Q000379:methods*; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D010363:Pattern Recognition, Automated / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity