Comput Methods Programs Biomed - Ventricular activity morphological characterization: ectopic beats removal in long term atrial fibrillation recordings.

Tópicos

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Resumo

Ectopic beats are early heart beats remarkably different to the normal beat morphology that provoke serious disturbances in electrocardiographic analysis. These beats are very common in atrial fibrillation (AF), causing important residua when ventricular activity has to be removed for atrial activity (AA) analysis. In this work, a method is proposed to cancel out ectopics by discriminating between normal and abnormal beats, with an accuracy higher than 99%, through QRS morphological delineation and characterization. The most similar ectopics to the one under cancellation are clustered to provide a very precise cancellation template. Simulated and real AF recordings were used to validate the method. A new index, able to estimate the presence of ventricular residue after ectopics cancellation, was defined. Results by using the 2, 4, 6, ?, 30 most similar ectopics to the one under study yielded optimal cancellation for templates composed of 10 beats. Furthermore, these beats were very likely located close to the ectopic under cancellation, which could facilitate the algorithm implementation. As conclusion, the proposed method is an effective way to remove ectopics from long term AF recordings and get them ready for the application of any QRST cancellation technique able to extract the AA in optimal conditions. Moreover, it could also detect, characterize and remove ectopics in any other type of non-AF recordings.

Resumo Limpo

ectop beat earli heart beat remark differ normal beat morpholog provok serious disturb electrocardiograph analysi beat common atrial fibril af caus import residua ventricular activ remov atrial activ aa analysi work method propos cancel ectop discrimin normal abnorm beat accuraci higher qrs morpholog delin character similar ectop one cancel cluster provid precis cancel templat simul real af record use valid method new index abl estim presenc ventricular residu ectop cancel defin result use similar ectop one studi yield optim cancel templat compos beat furthermor beat like locat close ectop cancel facilit algorithm implement conclus propos method effect way remov ectop long term af record get readi applic qrst cancel techniqu abl extract aa optim condit moreov also detect character remov ectop type nonaf record

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