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Noninvasive Sudden Death Risk Stratification: Heart Rate Variability and Turbulence, and QT Dynamicity

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Current News in Cardiology

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Abstract

Variability in sinus-rhythm pacemaker activity over time is a major physiological characteristic of heart-rate behavior, and many cardiovascular and metabolic conditions result in a change in heart rate variability. The numerous studies of time- and frequency-dependent variability have improved our knowledge of the physiological and pathological patterns of heart-rate variability (HRV). The standard deviation of 24-h mean RR value (SDNN), and measurement of the total variance (or power) in the change of RR at high (HF) and low (LF) frequencies are commonly used to estimate HRV. Power-spectrum analysis (i.e. recording the distribution of power as a function of the frequency at which it occurs) requires the transformation of time-series data by means of advanced mathematical algorithms, generally the fast Fourier transform (FFT) (Fig. 1), which is particularly useful in disclosing the harmonic components of variability.

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Authors and Affiliations

  1. Arrhythmology Unit, Cardiac/Thoracic/Vascular Department, San Gerardo Hospital, Monza, Italy

    Antonio Vincenti & Stefano Pedretti

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  1. Antonio Vincenti
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  2. Stefano Pedretti
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Editors and Affiliations

  1. “Garibaldi-Nesima” Hospital, Catania, Italy

    Michele M. Gulizia MD (Chief of Cardiology Division) (Chief of Cardiology Division)

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© 2007 Springer-Verlag Italia

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Vincenti, A., Pedretti, S. (2007). Noninvasive Sudden Death Risk Stratification: Heart Rate Variability and Turbulence, and QT Dynamicity. In: Gulizia, M.M. (eds) Current News in Cardiology. Springer, Milano. https://doi.org/10.1007/978-88-470-0636-2_23

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  • DOI: https://doi.org/10.1007/978-88-470-0636-2_23

  • Publisher Name: Springer, Milano

  • Print ISBN: 978-88-470-0635-5

  • Online ISBN: 978-88-470-0636-2

  • eBook Packages: MedicineMedicine (R0)

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