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Table 3 HF, LF/HF, and NRS data of the two groups immediately after admission to PACU

From: Differences in heart rate variability may be related to the appearance of postoperative pain in patients undergoing breast cancer surgery

  Group A Group B p value
HF 35.4 ± 18.1 64.2 ± 9.5* 0.016
LF/HF 2.7 ± 2.4 0.6 ± 0.2* 0.016
NRS at immediately after admission to PACU 0.9 ± 0.8 0.3 ± 0.5 0.169
  1. Group A (16 patients whose postoperative pain did not increase 12 h after the surgery)
  2. Group B (four patients whose postoperative pain increased 1 h after the surgery)
  3. Data are expressed as means ± SD
  4. LF low-frequency power, HF high-frequency power, NRS numerical rating scale, PACU post-anesthesia care unit
  5. *p < 0.05 compared with group A