Table 4

HRV analysis

PreoperativePostoperative
Normoglycemia
 RR (s)0.92 (0.04)1.08 (0.01)***
 PTOT (ms2, log)3.64 (0.05)3.79 (0.03)***
 PLF (ms2, log)3.11 (0.05)3.21 (0.03)**
 PHF (ms2, log)2.88 (0.12)3.02 (0.03)***
 PLF/PHF ratio (log)0.23 (0.03)0.19 (0.03)
Hypoglycemia
 RR (s)0.89 (0.04)0.99 (0.01)***
 PTOT (ms2, log)3.57 (0.06)3.77 (0.04)***
 PLF (ms2, log)3.01 (0.06)3.13 (0.04)**
 PHF (ms2, log)2.66 (0.07)2.89 (0.05)***
 PLF/PHF ratio (log)0.36 (0.10)0.25 (0.03)***
Change from normoglycemia to hypoglycemia
 RR (s)−0.03 (0.02)−0.08 (0.01)***
 PTOT (ms2, log)−0.07 (0.06)−0.01 (0.03)
 PLF (ms2, log)−0.09 (0.07)−0.07 (0.04)
 PHF (ms2, log)−0.23 (0.07)−0.14 (0.04)*
 PLF/PHF ratio (log)0.14 (0.05)0.07 (0.03)*
  • Values are given as the mean (SEM). Spectral indices are log-transformed. Hypoglycemia, 90–165 min; normoglycemia, 0–60 min; RR, mean interbeat R-R interval. Results indicate higher parasympathetic activity during normoglycemia postsurgery and lower sympathetic response to hypoglycemia postsurgery.

  • *P < 0.05; **P < 0.01; ***P < 0.001.