Key result
A 10th order Legendre polynomial fit algorithm achieved a 100% waveform discrimination success rate between sinus rhythm and ventricular tachycardia in 8 of 10 patients.
Why the study?
Does an algorithm based on Legendre polynomial approximation accurately distinguish between sinus rhythm and ventricular tachycardia waveforms?
Observational (n=10)
Does an algorithm based on Legendre polynomial approximation accurately distinguish between sinus rhythm and ventricular tachycardia waveforms?
Answers are grounded in this paper and cite their sources.
A Legendre polynomial approximation algorithm shows high success rates in discriminating between sinus rhythm and ventricular tachycardia waveforms, with potential applications for implantable cardioverter defibrillators.
A new algorithm to distinguish normal sinus rhythm (SR) and ventricular tachycardia (VT) waveforms based on coefficients of a Legendre polynomial approximation has been developed. The application of this technique is intended for rhythm distinction of intraventricular signals such as those sensed by implantable cardioverter defibrillators (ICDs). In this study of 10 patients with both SR and VT, a 10th order polynomial fit produced a waveform discrimination success rate of 100% for 8 patients, while for the two remaining patients the success rates were 69% and 96%. The effect of using fewer coefficients was also analyzed using coefficient reduction techniques based on probability of error (POE), average correlation coefficient (ACC), and eigenvectors (EV). It was found that for SR, a better discrimination rate could be achieved by using 8 coefficients instead of 21 by the POE method. Similarly 15 coefficients of VT gave better discrimination rates.
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Shiu et al. (2002) conducted an observational in Sinus rhythm and ventricular tachycardia (n=10). Legendre polynomial approximation algorithm was evaluated on Waveform discrimination success rate. A 10th order Legendre polynomial fit algorithm achieved a 100% waveform discrimination success rate between sinus rhythm and ventricular tachycardia in 8 of 10 patients.
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