Figure 8.

Individual values of four representative heart rate variability metrics for life-saving intervention (LSI; n = 32) and No-LSI (n = 127) patient groups (each point represents a single patient). For each HRV metric, group means statistically differ between LSI and No-LSI groups (P ≤ 0.03). The percentage of individual LSI patient values that fall within the range of the No-LSI group are presented in each plot. RMSSD, R–R intervals root mean squared SD (a time domain metric); RRIHF, R–R intervals high frequency (a frequency domain metric); SampEn, sample entropy (a non-linear metric); DFA-L, detrended fluctuations analysis – long range correlations (a non-linear metric). From Rickards et al. (2010b).