Table 1 List of HRV parameters/features extracted from ECG signals
From: Utilizing heart rate variability to predict ICU patient outcome in traumatic brain injury
HRV parameter | Description (30Â min ECG) |
|---|---|
HR | The mean heart rate |
RR | The mean of RR intervals |
SDNN | Standard deviation of RR intervals |
RMSSD | Square root of the mean squared differences between successive RR intervals |
CVRR | Coefficient of variance of RR intervals |
 VLF_Hz | Peak frequency for VLF band |
 LF_Hz | Peak frequency for LF band |
 HF_Hz | Peak frequency for HF band |
 VLF_ms_sq | Absolute power of VLF band |
 LF_ms_sq | Absolute power of LF band |
 HF_ms_sq | Absolute power of HF band |
 VLF_perc | Relative powers of VLF band |
 LF_perc | Relative powers of LF band |
 HF_perc | Relative powers of HF band |
 LF_nu | Power of LF band in normalized unit |
 HF_nu | Power of HF band in normalized unit |
 Total_ms_sq | Total spectral power |
 LF/HF | Ratio between LF and HF band powers |
 SD1 | Standard deviation of Poincaré plot, nonlinear method to measure short-term variability |
 SD2 | Standard deviation of Poincaré plot, nonlinear method to measure long-term variability |