Abstract
Background and purpose: With the emergence of long-term electrocardiogram (ECG) recordings that extend several days beyond the typical 24-48 h, the development of new tools to measure heart rate variability (HRV) and QT variability is needed to utilize the full potential of such extra-long-term ECG recordings. Methods: In this report, we propose a new nonlinear time-frequency analysis approach, the concentration of frequency and time (ConceFT), to study the HRV QT variability from extra-long-term ECG recordings. This approach is a generalization of Short Time Fourier Transform and Continuous Wavelet Transform approaches. Results: As proof of concept, we used 14-day ECG recordings to show that the ConceFT provides a sharpened and stabilized spectrogram by taking the phase information of the time series and the multitaper technique into account. Conclusion: The ConceFT has the potential to provide a sharpened and stabilized spectrogram for the heart rate variability and QT variability in 14-day ECG recordings.
Original language | English (US) |
---|---|
Article number | 54 |
Journal | BioMedical Engineering Online |
Volume | 17 |
Issue number | 1 |
DOIs | |
State | Published - May 3 2018 |
Keywords
- Concentration of frequency and time (ConceFT)
- Heart rate variability
- Long-term ECG recording
- QT variability
- Time-frequency analysis
ASJC Scopus subject areas
- Radiological and Ultrasound Technology
- Biomaterials
- Biomedical Engineering
- Radiology Nuclear Medicine and imaging