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Table 2 Time-domain parameters of HRV

From: Atrial fibrillation and alteration of heart rate variability after video-assisted pulmonary lobectomy versus thoracotomy pulmonary lobectomy

  VATS(n = 112) THOR (n = 112) P value
RR interval (ms)
Pre-op 2 h 620 ± 108 612 ± 130 0.43
Pre-op 4 h 683 ± 109 708 ± 104 0.89
Post-op12h 670 ± 118 706 ± 129 0.59
Post-op24h 657 ± 108 648 ± 132 0.79
SDNN (ms)
Pre-op 2 h 35 ± 26 37 ± 28 0.81
Pre-op 4 h 50 ± 37 48 ± 37 0.12
Post-op12h 61 ± 43 55 ± 31 0.51
Post-op24h 63 ± 42 58 ± 33 0.77
rMssD (ms)
Pre-op 2 h 31 ± 26 33 ± 36 0.79
Pre-op 4 h 42 ± 60 38 ± 58 0.08
Post-op12h 43 ± 41 36 ± 53 0.81
Post-op24h 51 ± 39 45 ± 56 0.76
pNN50%
Pre-op 2 h 2.1 ± 4.8 2.3 ± 5.5 0.66
Pre-op 4 h 3.8 ± 3.1 3.2 ± 5.6 0.73
Post-op12h 3.5 ± 5.2 2.6 ± 5.7 0.41
Post-op24h 3.9 ± 5.9 2.7 ± 6.6 0.32