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Table 3 Comparison of HRV before and after propanolol

From: Effect of propranolol on heart rate variability in hyperthyroidism

Variable Before After p
RMSSD (ms) 22.3 ± 13.4 25.2 ± 12.1 0.17
SDNN index 34.1 ± 14.6 35.8 ± 11.7 0.75
LF (n.u.) 51.2 ± 24.5 50.8 ± 22 0.91
HF (n.u.) 28.6 ± 19.5 31.9 ± 18.6 0.46
LF/HF 4.3 ± 5.6 3.1 ± 3.2 0.24
  1. RR R to R interval, HR heart rate, RMSSD root-mean-square of successive differences, SDNN standard deviation of all normal R to R interval, LF low frequency, HF high frequency