Distinguishing ventricular extrasystoles from normal heartbeats is crucial to cardiac arrhythmia analysis. This paper proposes novel morphological descriptors, the major portrait partition area (MPPA) and point distribution percentage (PDP), which are extracted from the reconstructed phase space of the QRS complex. These measures can be linked to QRS width and prolonged ventricular contraction, and offer several advantages over traditional characterization of the QRS structure: it does not require QRS boundary detection, is robust under R-peak misalignment, and including some information from nearby points. The first four principal components of MPPA variables and PDPs in the first and the third quadrants of the phase space diagram were used as inputs of neural networks. The performance of networks in distinguishing premature ventricular contraction events from normal heartbeats were evaluated under a series of 50 cross-validations based on the electrocardiogram data taken from the MIT/BIH arrhythmia database. The sensitivity and specificity obtained using the aforementioned MPPA principal components and PDPs as inputs were similar to those obtained using wavelet features and Hermite coefficients. However, the phase space information performed better in situations of noise contaminations and waveform deformations.
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The authors would like to acknowledge the support provided by grants from the Ministry of Economic Affairs (Taiwan) under Contract 95-EC-17-A-19-S1-055 and from the National Science Council (Taiwan) under Contract NSC 97-2220-E-182-001.
Author information Authors and AffiliationsDepartment of Electrical Engineering, Chang Gung University, 259 Wenhwa 1st Road, Kweishan, Taoyuan, 333, Taiwan
Hsiao-Lung Chan, Shih-Chin Fang & Pei-Kuang Chao
Department of Cardiology, Chang Gung Memorial Hospital, Taoyuan, Taiwan
Chun-Li Wang
Department of Neurology, Cardinal Tien Hospital Yung Ho Branch, Taipei, Taiwan
Shih-Chin Fang
Department of Computer Science and Information Engineering, Chang Gung University, Taoyuan, Taiwan
Jyh-Da Wei
Correspondence to Hsiao-Lung Chan.
Additional informationAssociate Editor Erik L. Ritman oversaw the review of this article.
About this article Cite this articleChan, HL., Wang, CL., Fang, SC. et al. Recognition of Ventricular Extrasystoles Over the Reconstructed Phase Space of Electrocardiogram. Ann Biomed Eng 38, 813–823 (2010). https://doi.org/10.1007/s10439-010-9908-6
Received: 07 March 2009
Accepted: 04 January 2010
Published: 13 January 2010
Issue Date: March 2010
DOI: https://doi.org/10.1007/s10439-010-9908-6
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