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. Author manuscript; available in PMC: 2018 Jul 1.
Published in final edited form as: Crit Care Med. 2017 Jul;45(7):e683–e690. doi: 10.1097/CCM.0000000000002364

Table 2.

List of HRV features used in this work for the classification of sedation levels.

Domain Features
Time

  • Maximum, minimum, mean, median of NN.

  • Standard deviation of NN (SDNN), percentage of consecutive NNs that vary by 5, 10, 15, 20, 25, 30 ms (pNNx).

  • Root mean square of SDNN (RMSDD), mean heart rate (MHR), standard deviation of heart rate (SDHR), HRV triangular index, coefficient of variation.

  • Max change in NN (MCNN), Mean of the absolute value of first derivative of NN (MAFDNN), Nonlinear energy, Line length.
Frequency

  • PVLF-Power in very low frequency spectrum (0.003–0.04 Hz).

  • PLF-Power in low frequency spectrum (0.04–0.15Hz).

  • PHF-Power in high frequency spectrum (0.15–0.4 Hz).

  • PLF/PHF.

  • PLF/PTOT × 100, PTOT is the total power spectrum.

  • PHF/PTOT × 100.
Nonlinear

  • Poincaré plot measures (SD1, SD2).
Complexity

  • Shannon entropy.

  • Spectral entropy.

  • Kolmogorov complexity.