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Table 4 Measurements of HRV parameters and clinical signs of recruited patients

From: Prediction of adverse cardiac events in emergency department patients with chest pain using machine learning for variable selection

  No MACE within 72 h (N = 673) MACE within 72 h (N = 29) p
Clinical signs    
Glasgow Coma Scale 15 (15 to 15) 15 (15 to 15) 0.001
Temperature (°C) 36.4 (0.6) 36.4 (0.5) 0.871
Pulse rate (beats/minute) 79 (17) 86 (15) 0.008
Respiratory rate (breaths/minute) 18 (3) 20 (5) 0.010
Systolic BP (mmHg) 142 (28) 124 (31) 0.001
Diastolic BP (mmHg) 77 (15) 67 (17) 0.001
Oxygen saturation (%) 98 (4) 97 (4) 0.469
Pain score 2 (0 to 4) 3 (0 to 5) 0.358
HRV parameters    
aRR (s) 0.831 (0.171) 0.723 (0.139) 0.001
STD (s) 0.038 (0.028) 0.034 (0.020) 0.657
avHR (beats/minute) 75.545 (15.862) 86.122 (15.927) 0.001
sdHR (beats/minute) 3.618 (2.735) 4.328 (2.886) 0.099
RMSSD (s) 0.037 (0.039) 0.039 (0.307) 0.376
pNN50 (%) 7.294 (12.617) 7.978 (9.695) 0.198
NN50 (count) 23 (41) 31 (44) 0.220
Triangular index 3.009 (1.233) 2.481 (0.969) 0.025
TINN 0.134 (0.086) 0.105 (0.069) 0.086
LF power (ms2) 0.128 (0.074) 0.106 (0.092) 0.024
HF power (ms2) 0.125 (0.075) 0.139 (0.080) 0.303
Total power (ms2) 0.489 (0.110) 0.434 (0.177) 0.054
LF power norm (n.u.) 51.173 (20.535) 40.947 (22.966) 0.020
HF power norm (n.u.) 48.827 (20.535) 59.053 (22.996) 0.020
LF/HF 1.641 (1.869) 1.018 (0.910) 0.021
  1. Data are shown as mean (standard deviation) or median (interquartile range, 25th to 75th percentiles). The p-values are calculated from the Mann–Whitney test.
  2. MACE: major adverse cardiac events; For HRV parameters, refer to Table 1.